Pump, Valve, Compressor & Fluid-Handling Equipment Manufacturing HVAC Duct Guide

1. Why pump, valve and compressor manufacturing HVAC is its own engineering discipline

A pump, valve or compressor factory is one of the most demanding HVAC environments in Australian heavy manufacturing, because a single plant can run nearly every metal-processing hazard at once. Inside one building — the Davey Water Products plant at Scoresby VIC, the Weir Minerals Warman slurry-pump works at Artarmon NSW, the KSB Australia facility at Bundamba QLD — you can find oil mist rolling off a 5-axis machining centre boring a cast-iron pump body in one bay, hexavalent chromium oxidising off a duplex stainless weld in the next, respirable crystalline silica drifting from a sand-mould shakeout if the plant casts its own bodies, isocyanate vapour curing off a two-pack polyurethane top-coat in the paint shop, and a slurry pump dumping its full absorbed shaft power as heat into a performance test cell at the back. Each of those processes has its own characteristic dust load, fume chemistry, ignition risk, hazardous-area zoning requirement and material specification. HVAC ductwork inside a fluid-handling equipment plant is not a commodity item. It is a process-engineering problem that touches AS 1668.2 mechanical ventilation, AS/NZS 1554 welding-fabrication compliance, AS 3957 combustible-dust safety, AS 1375 furnace safety, AS 1940 flammable-liquid storage, AS/NZS 60079 hazardous-area electrical compliance, and the SafeWork Australia workplace exposure standards for every contaminant, all sitting inside the same building envelope.

This guide writes against the full breadth of the Australian pump, valve, compressor and fluid-handling manufacturing sector as it exists in 2026. Pump manufacturing is the largest tier. Davey Water Products at Scoresby VIC and the Onga brand build domestic, rural and light-commercial pumps in high volume, with extensive CNC machining and assembly. Southern Cross Pumps & Irrigation at Toowoomba QLD builds windmill, turbine and centrifugal pumps for the rural and irrigation market. Weir Minerals Australia at Artarmon NSW builds the Warman slurry-pump range — the dominant Australian mining slurry pump — with heavy fabrication, chrome-iron and stainless wet-ends, rubber lining and a large test floor. KSB Australia at Bundamba QLD builds and services industrial, water-utility and mining pumps. Grundfos Australia, Xylem (Lowara), Pentair, Kelair Pumps, Brown Brothers Engineers and Flowserve Australia run machining, assembly and test operations across Melbourne, Sydney, Brisbane, Perth and Adelaide serving water infrastructure, building services, mining and process industry.

Valve manufacturing is the second tier. AVK Australia builds water-utility valves; Tyco and Johnson Controls build fire-protection and building-services valves; Bürkert, Cla-Val and Crane build process-control and specialty valves. Valve plants combine CNC machining of valve bodies, gates and seats, welding and fabrication, coating (including fusion-bonded-epoxy on water-utility valves), and pressure and seat-leak testing. Reliance Worldwide (RWC) in Brisbane builds plumbing fittings and the SharkBite range at high volume, combining machining, forming and assembly. Compressor manufacturing and packaging is the third tier. Atlas Copco and Champion/CAPS build and package rotary-screw and reciprocating air compressors, where the dominant HVAC demand is the heat-and-noise load of the performance test cell. Across all three tiers, the demand on the Australian water-infrastructure, mining, renewables and process sectors is rising — desalination and water-recycling projects, the mining capital cycle in WA and QLD, pumped-hydro and renewables balancing, and bushfire and building-services upgrades are all driving pump, valve and compressor demand, and with it new and expanded manufacturing capacity.

Across this entire sector, fluid-handling-equipment ductwork must survive several simultaneous demands. Oil-mist and coolant-aerosol resistance at the machining cells (oil mist creeps through unsealed seams and turns galvanised duct into a fire-load). Hexavalent-chromium-rated capture at the welding bays (the Cr(VI) WES of 0.0003 mg/m3 is among the most stringent in the entire Australian standard). Combustible-dust deflagration resistance at grinding, linishing and FBE powder coating (AS 3957 dust-hazard classification, AS/NZS 60079 zoning, conductive bonded duct). Chemical and corrosion resistance at coating, passivation and rubber-lining solvent stations. High-temperature service at heat-treat, stress-relief and any integrated melt furnace (170 to 1100 degrees C, and 1400 degrees C-plus at an iron or steel melt). And high-volume heat-and-noise management at the hydrostatic and performance test cells. Each is manageable in isolation. Together they explain why a generic commercial fabricator treating a pump or valve plant as just another industrial job loses money on the first project and walks away from the second.

This guide walks every major process zone in a fluid-handling equipment plant and explains what changes about the ductwork. We start with the Australian regulatory backbone, then map the plant section by section — casting, machining, welding, grinding, assembly, coating, heat-treat, test, rubber-lining and NDT — then close with the SBKJ machine configuration that gives an Australian fabricator the production envelope to serve this market from Box Hill North VIC across the country.

2. The Australian regulatory stack — AS 1668, AS 4254, AS/NZS 1554, AS 3957, AS 1375, AS 1940, AS/NZS 60079, AS 4024 and the WES

HVAC for pump, valve and compressor manufacturing in Australia sits at the intersection of more than two dozen overlapping standards and codes. Ignoring any one of them is a notice of non-compliance from SafeWork Australia, the state work-health-and-safety regulator, or the state EPA, waiting to happen. The standards stack splits into building-code and mechanical-ventilation compliance, occupational-health exposure compliance, welding-fabrication compliance, combustible-dust safety, furnace and flammable-liquid safety, hazardous-area electrical compliance, machinery safety, and the over-arching quality and environmental management systems.

2.1 AS 1668.2 and AS 1668.1 — mechanical ventilation and fire

AS 1668.2 is the umbrella mechanical-ventilation standard for Australia, covering the use of mechanical ventilation and air conditioning in buildings, including the required outdoor-air rates and the dilution of contaminants where local exhaust is impractical. Pump, valve and compressor plants fall under National Construction Code (NCC) Class 8 industrial occupancy; AS 1668.2 sets minimum extract and dilution provisions for metal handling, machining, grinding, welding and painting operations. In practice a well-designed fluid-handling plant seldom relies on the building-volume dilution figure — localised exhaust ventilation at each individual dust, mist and fume source drives total exhaust well above the dilution minimum. Where AS 1668.2 matters most is the make-up air requirement: every cubic metre extracted from a machining enclosure, welding canopy, spray booth, furnace hood or test cell must be replaced by tempered, filtered, controlled-velocity supply air. AS 1668.1 covers the fire and smoke control aspects of air-handling systems, governing fire and smoke dampers, fan shut-down and the fire-mode behaviour of the ductwork at compartment boundaries.

2.2 AS 4254 — sheet-metal duct construction

AS/NZS 4254.1 (rigid sheet metal) and AS/NZS 4254.2 (flexible) govern duct construction across the normal pressure ranges — low pressure (up to 500 Pa), medium pressure (up to 1000 Pa) and high pressure (up to 2500 Pa). Most fluid-handling-plant supply air, general extract and LEV duct sit inside AS 4254 ranges. Heat-treat and furnace exhaust in their refractory or high-temperature stainless sections run beyond AS 4254 and require purpose-engineered construction; AS 4254 picks up again on the cool side downstream of the cooling and dilution zone. AS 4254 sets the gauge, reinforcement, joint and sealing requirements that the SBKJ machine line is built to meet.

2.3 AS/NZS 1554.1 and AS/NZS 1554.6 — welding of the ductwork and of the product

AS/NZS 1554.1 covers the welding of carbon and carbon-manganese steel structures and AS/NZS 1554.6 covers the welding of stainless steel for structural and corrosion-resisting purposes. The standard is doubly relevant in a pump and valve plant: it governs the welding of the duct itself (continuous TIG seam on 316L oil-mist and Cr(VI) duct, fabricated to a documented procedure) and it is the parent standard the plant uses to weld stainless and duplex pump bases, skids, manifolds and wet-end fabrications — the very welding that generates the Cr(VI) fume the HVAC system must capture. Specifying duct seam welds to AS/NZS 1554.6 gives the operator audit-ready paperwork consistent with their product fabrication.

2.4 AS 3957 — dust hazard areas, the combustible-dust standard

AS 3957 is the Australian dust-hazard standard and the critical document wherever a fluid-handling plant grinds, linishes, polishes, blasts or powder-coats. It covers combustible-dust deflagration risk — fine aluminium and aluminium-bronze dust, magnesium dust where light-alloy components are finished, certain stainless and metal dusts, and the combustible FBE epoxy powder used to coat water-utility valves. AS 3957 mandates hazard-area zoning (Zone 20 for continuous explosible-dust concentration, Zone 21 for occasional, Zone 22 for unlikely) and drives the AS/NZS 60079.10.2 electrical-equipment selection downstream. For a duct designer, AS 3957 forces the question at every dry-dust collection point: what is the explosibility of this dust, what is its deflagration index Kst, what is the minimum ignition energy, and what is the engineered deflagration-protection chain between the collector and the inbound duct? The answer drives collector selection, isolation-device placement and the bonding-and-grounding of every metre of duct in the dust-laden circuit. Where the Australian standard is silent on a specific metallurgy, designers cross-reference NFPA 68 (deflagration venting) and NFPA 69 (explosion prevention by inerting and suppression).

2.5 AS 1375 — industrial furnaces and the heat-treat and melt envelope

AS 1375, the SAA Industrial Fuel-Fired Appliances Code, governs the safe operation of fuel-fired furnaces and ovens. In a fluid-handling plant it applies to stress-relief and annealing furnaces (600 to 1100 degrees C for stainless and steel components and weldments), to rubber-cure ovens and autoclaves (140 to 160 degrees C for slurry-pump lining), to coating-cure ovens, and — where a foundry is integrated — to the melt furnace itself. AS 1375 sets the combustion-air, purge, flame-supervision and burner-management requirements; the exhaust ductwork downstream is sized for the flue-gas temperature and volume, with carbon monoxide (30 ppm) and combustion products driving the dilution and discharge design. Reducing-atmosphere heat-treat adds an explosive-gas concern that links AS 1375 to the hazardous-area standards.

2.6 AS 1940 — storage and handling of flammable and combustible liquids

AS 1940 governs the storage and handling of flammable and combustible liquids in Australian workplaces. Pump, valve and compressor plants trigger AS 1940 at the paint shop (two-pack polyurethane, epoxy and solvent thinners), at the slurry-pump rubber-lining bench (solvent-based contact adhesive), at parts-washing and degreasing stations, and at any straight-oil cutting-fluid bulk store. Each station requires bunded containment, a dedicated LEV branch, segregated storage, and AS/NZS 60079 hazardous-area zoning around the immediate work area. The paint mixing room and the adhesive lay-up area are the dominant AS 1940 envelopes in a fluid-handling plant.

2.7 AS/NZS 60079 — explosive atmospheres, the dominant electrical-safety standard

AS/NZS 60079 is the hazardous-area-classification standard. Fluid-handling-equipment plants trigger AS/NZS 60079.10.1 (gas and vapour) and AS/NZS 60079.10.2 (dust) at multiple locations:

• Zone 1: Gas/vapour likely in normal operation. The interior of a spray booth during spraying, the immediate zone above a solvent-adhesive lay-up bench, the immediate zone above an open solvent or parts-wash bath.
• Zone 2: Gas/vapour unlikely in normal operation, short duration. The general paint-shop volume, the general area around a degreasing station.
• Zone 21: Occasional explosible-dust release in normal operation. The immediate area around an FBE powder-coat booth, the immediate area around a combustible-metal-dust linishing or polishing station.
• Zone 22: Unlikely dust release, short duration. The general grinding and finishing room around the equipment.

AS/NZS 60079 drives Ex-rated electrical-equipment requirements for fans, motors, instrumentation, duct-mounted sensors and lighting in and near the affected zones. Combustible-dust and FBE ductwork must be conductive throughout (316L stainless is the default), continuously bonded with conductive flange gaskets, externally bonded to the building earth grid, and pressure-tested with documented earth-resistance verification (less than 1 ohm to ground at every section) at commissioning.

2.8 AS 4024, AS/NZS 1715/1716 and AS/NZS 2243.8 — machinery safety, RPE and fume cupboards

AS 4024 is the machinery-safety standard set, governing guarding, access and the safe design of the machines the ductwork serves and the access required to inspect and clean the ductwork itself. AS/NZS 1715 (selection, use and maintenance) and AS/NZS 1716 (equipment standards) cover respiratory protective equipment — the powered air-purifying respirators and supplied-air systems mandatory for silica-bearing foundry and grinding tasks, for Cr(VI) welding, and for spray painting, where LEV alone cannot reduce exposure below the WES. AS/NZS 2243.8 covers fume cupboards and laboratory ventilation, relevant in the materials-test, metallurgical and chemistry laboratories of a larger pump or valve plant and at any chemical passivation or dye-penetrant station.

2.9 NCC Section J, ASHRAE 62.1 and the energy envelope

NCC Section J sets the energy-efficiency provisions for the building, including the air-handling-system fan power, duct insulation and the energy performance of the conditioning plant. ASHRAE 62.1 (Ventilation for Acceptable Indoor Air Quality) is the international reference frequently called up alongside AS 1668.2 for the occupied-zone outdoor-air rates in offices, control rooms and assembly areas. Both feed into the make-up-air and heat-recovery design discussed later in this guide.

2.10 ISO 9001, ISO 14001 and ISO 45001 — the management systems

Most established Australian pump, valve and compressor manufacturers operate certified quality (ISO 9001), environmental (ISO 14001) and occupational health and safety (ISO 45001) management systems. The HVAC and LEV infrastructure is documented within these systems: ISO 45001 requires documented LEV maintenance records and breathing-zone air-sampling data against the WES; ISO 14001 requires documented stack-emission control; ISO 9001 requires the duct fabrication itself to be traceable. Every length of ductwork SBKJ supplies is delivered with mill certificate, fabrication date, pressure-test record and earth-bonding verification, forming the foundation paperwork the operator integrates into its management-system audit pack.

2.11 SafeWork Australia workplace exposure standards — the chemistry-driven sizing inputs

SafeWork Australia’s workplace exposure standards (WES) are the regulatory inputs that drive LEV capture velocity and ductwork sizing across a fluid-handling-equipment plant. The relevant standards are extensive:

• Oil mist (mineral): 5 mg/m³ TWA. From metalworking-fluid mist at CNC turning, milling and boring of pump bodies, impellers and valve bodies. Does not drop out like solid dust; lower transport velocity but a fire-load concern in the duct.
• Welding fume (not otherwise classified): now controlled as a Group 1 carcinogen with the principle of keeping exposure as low as reasonably practicable. From all arc welding of bases, skids, manifolds and wet-ends.
• Manganese: 1 mg/m³. From welding consumables and from manganese in carbon-manganese and chrome-iron parent metal.
• Hexavalent chromium Cr(VI): 0.0003 mg/m³ (0.3 µg/m³) TWA — THE KILLER of stainless and duplex fabrication. From welding stainless 316/304, duplex and super-duplex, and chrome-iron wet-ends. IARC Group 1 human carcinogen. One of the lowest limits in the entire standard.
• Iron oxide fume: 5 mg/m³. From melt, pouring and steel welding.
• Copper and bronze fume: 0.2 mg/m³ (fume). From bronze and gunmetal pump-body and impeller casting and machining, and from bronze welding.
• Respirable crystalline silica (RCS): 0.05 mg/m³ TWA — the foundry and grinding killer. From green-sand and resin-bonded sand moulds, shakeout, and abrasive blasting and grinding media.
• Ozone (O3): 0.1 ppm. From the UV of the arc plasma at welding.
• Isocyanate (TDI/MDI/HDI): 0.02 mg/m³ — THE KILLER of the paint shop. From two-pack polyurethane hardeners and many primer systems. Potent respiratory sensitiser; cause of occupational asthma.
• Xylene: 80 ppm. Plus toluene 50 ppm and a family of aromatic and ketone solvents from paint thinners and rubber-lining adhesive.
• Carbon monoxide (CO): 30 ppm. From fuel-fired heat-treat, melt and rubber-cure furnaces and from any combustion prime mover on the test floor.
• Carbon dioxide (CO2): 5000 ppm. Indoor-air-quality marker; rises in poorly ventilated cells and enclosed test bays.
• Combustible metal and FBE dust: AS 3957 deflagration hazard. Fine aluminium, aluminium-bronze and certain metal dusts from linishing and polishing, plus FBE epoxy powder overspray.

Every dust, mist and fume LEV branch in a fluid-handling plant has to keep the operator’s breathing-zone air below the relevant WES. Where multiple contaminants are present together — Cr(VI) plus manganese plus nickel plus ozone at a duplex welding bay — the additive-mixture rule applies and the LEV must be sized to the lowest practical fraction. This is the calculation that drives capture velocity, transport velocity, branch sizing and main sizing across every duct system in the plant, and it is set out in detail in the dilution-and-sizing section later in this guide.

3. Foundry and casting ventilation — cast-iron, bronze, stainless and duplex pump bodies and impellers

Many of the larger Australian pump and valve makers cast their own bodies, impellers, volutes, casings and valve bodies rather than buying castings in. A pump or valve maker with an integrated foundry — casting grey and ductile cast iron, bronze and gunmetal, stainless and duplex, and the high-chrome white irons used for slurry-pump wear parts — faces the highest-hazard ventilation envelope in the plant. SBKJ publishes a dedicated foundry HVAC article that covers the casting process end-to-end; this section keeps the focus on the foundry as one section of a pump or valve plant and on how its ductwork shares the construction philosophy of the rest of the building.

The foundry hazard tree has four dominant branches. First, melt-furnace fume: an induction or cupola furnace melting iron, or a crucible furnace melting bronze, generates iron-oxide fume (5 mg/m³), copper and bronze fume (0.2 mg/m³), manganese (1 mg/m³) and trace metals, plus combustion products on a fuel-fired furnace. Second, pouring fume: as molten metal is poured into the mould, the thermal decomposition of mould binders, coatings and any residual moisture generates a dense pouring fume. Third, sand-mould respirable crystalline silica: green-sand and resin-bonded sand moulds are predominantly silica sand, and every operation that disturbs dry sand — mould-making, core-making, knock-out and especially shakeout — releases RCS, controlled to the SafeWork WES of 0.05 mg/m³. Fourth, shakeout and fettling dust: breaking the sand mould off the hot casting and the subsequent rough grinding (fettling) of gates, risers and flash generates a mixed silica-and-metal dust at high concentration.

The HVAC response maps to AS 1375 for the furnace combustion side, AS 3957 for the silica and metallic dust-hazard classification, and AS 1668.2 for the general dilution and the substantial make-up air a hot foundry needs. The melt-furnace canopy is a high-temperature hood; the first few metres of its exhaust riser are refractory-lined or 309/310S high-temperature stainless because the gas leaves the furnace hot, transitioning to 316L or aluminised steel once the gas has cooled. The pouring line is captured by a side-draught or canopy hood over the pouring station. Sand handling, mould-making, knock-out and shakeout each get dedicated dust LEV at 18 to 22 m/s transport velocity into a baghouse with cyclone pre-separation, because RCS at 0.05 mg/m³ is unforgiving and the dust loading at shakeout is heavy. Fettling and rough-grinding stations feed the grinding-dust circuit described in the linishing section.

For the slurry-pump sector specifically, the high-chrome white-iron wear parts that line a Warman-style slurry pump are cast and then heat-treated to develop the hard carbide microstructure. The casting and the subsequent grinding of these very hard, abrasive parts drives a combustible-and-abrasive dust circuit that must be built in wear-resistant 316L spiral. The foundry section of a pump plant, in short, shares the same 316L stainless and heavy-gauge construction philosophy used across the machining, welding and heat-treat zones — the difference is the high-temperature transition at the melt furnace and the heavy silica dust loading at shakeout.

4. CNC machining oil-mist LEV — turning, milling and boring pump bodies, impellers and valve bodies

CNC machining is the heart of every pump, valve and compressor plant. Cast or forged pump bodies, impellers, casings, shafts, valve bodies, gates, seats and compressor rotors and housings are turned, milled and bored to final dimension on 5-axis machining centres, vertical and horizontal turning lathes, and boring mills. Davey Water Products at Scoresby VIC, KSB Australia at Bundamba QLD, Weir Minerals at Artarmon NSW, Grundfos, Xylem, Kelair Pumps, Reliance Worldwide in Brisbane and every other Australian fluid-handling manufacturer runs extensive CNC machining, and the dominant HVAC demand at the machining cell is metalworking-fluid oil-mist and coolant-aerosol local exhaust ventilation.

The contaminant has two forms that share a duct but must be analysed separately. Straight (neat) cutting oils — mineral oils with chlorinated, sulphurised or fatty additives used for heavy cuts, threading and broaching — generate a true oil mist and oil smoke (the smoke fraction is the sub-micron condensate from oil flashing on the hot cutting edge). Water-miscible coolants — soluble-oil, semi-synthetic and synthetic emulsions used for high-speed machining — generate a water-based aerosol plus the bacterial and endotoxin contamination that builds up in a recirculated emulsion sump. SafeWork Australia sets the oil-mist WES at 5 mg/m³ TWA; water-miscible mist is controlled to the same practical limit. The sub-micron smoke fraction is the most penetrating and the hardest to collect.

The correct topology is full enclosure of the machining envelope. Every modern machining centre is supplied with a full enclosure as standard; the enclosure is exhausted at 0.3 to 0.5 m/s face velocity through the door and access apertures into a dedicated branch. Critically, an enclosed machine must be slightly extracted but not over-extracted — pulling too hard drags coolant out of the work zone and defeats the cutting process. The branch carries oil mist at 8 to 12 m/s transport velocity. This is lower than the 18 to 22 m/s used for solid dust, because oil mist and aerosol do not settle and re-entrain the way swarf-bearing dust does; the lower velocity reduces fan power and noise. The branch terminates at a mist collector — a multi-stage coalescing filter or an electrostatic precipitator — with a HEPA after-filter to capture the sub-micron smoke, never a dry fabric baghouse (oil blinds and then ignites a fabric filter). The cleaned air is discharged or, more commonly in a temperate Melbourne or Brisbane plant, recirculated to the workshop under AS 1668.2 provided the downstream filtration efficiency is verified and monitored.

The material choice for oil-mist duct is the issue that catches generic fabricators. Galvanised duct on straight chlorinated or sulphurised cutting-oil service corrodes from the inside as the additives break down, and oil-wetted galvanised duct becomes a fire-load that an oil-mist fire (started by a spark or hot chip carried into the duct) can run along the entire run. The durable answer is welded or hermetically sealed 304 or 316L stainless. The SBAL-V auto duct line forms the 316L body and the SBSF-1525 longitudinal stitch welder lays a continuous TIG bead on the seam, giving an oil-tight, cleanable, fire-resisting envelope from the machine-tool enclosure through to the coalescing mist collector. Swarf and fine machining chips are handled by the machine’s own chip conveyor and swarf-management system, not by the air system; the air system handles only the airborne mist and smoke.

A note on hybrid and high-pressure-coolant machining: the latest machining centres run high-pressure through-tool coolant at 70 bar and above, which dramatically increases the aerosol generation rate and the sub-micron fraction. A plant upgrading to high-pressure coolant must re-rate its mist-collection capacity and may need to increase enclosure extraction, which feeds back to the duct sizing. SBKJ sizes the 316L LEV branch and main for the upgraded aerosol load, not the legacy flood-coolant figure.

5. Welding and fabrication fume — hexavalent chromium on stainless and duplex bases, skids and manifolds

Pump and valve manufacturing involves extensive welding and fabrication: baseplates and skids that mount the pump and motor, suction and discharge manifolds, fabricated volutes and casings on large pumps, slurry-pump wet-end fabrications, pressure-vessel-grade fabrications on some compressor packages, and the welding-up of cast components. The welding-fume hazard depends entirely on the parent metal and consumable, and the dominant concern in a fluid-handling plant is hexavalent chromium.

When a fabricator welds stainless steel (304, 316), duplex or super-duplex stainless, or the high-chrome irons used for slurry-pump wear parts — all materials chosen for corrosion and abrasion resistance in fluid-handling service — the arc oxidises chromium in the parent metal and filler to hexavalent chromium, Cr(VI). SafeWork Australia sets the Cr(VI) WES at 0.0003 mg/m³ (0.3 micrograms per cubic metre) as an eight-hour TWA — one of the very lowest limits in the entire Australian standard, three to four orders of magnitude below general welding-fume figures. Cr(VI) is a confirmed human carcinogen (IARC Group 1). Alongside Cr(VI), stainless and Inconel welding releases nickel (1 mg/m³ inhalable, 0.1 mg/m³ for insoluble compounds), and all arc welding releases manganese (1 mg/m³), general welding fume (now treated as a Group 1 carcinogen with no safe airborne level), and ozone (0.1 ppm) from the UV-ionised air around the arc.

At these exposure limits the only defensible control is capture at the source. On-tool fume extraction — a capture nozzle integrated into the welding torch or a fume gun drawing the fume from within 50 to 100 mm of the arc — is the first line, capturing the bulk of the fume before it reaches the welder’s breathing zone. On-tool extraction is backed by overhead canopy hoods and movable extraction arms for positional and large-fabrication work where the torch-mounted nozzle cannot follow every weld. Capture velocity at the arc is 0.5 to 1.0 m/s. The duct runs 316L stainless at 18 to 22 m/s transport velocity to a cartridge or baghouse collector with HEPA polish, with the duct seam welded to AS/NZS 1554.1 (carbon steel) and AS/NZS 1554.6 (stainless) practice. Dedicated periodic Cr(VI) breathing-zone sampling verifies the control, and the additive-mixture rule combines Cr(VI), nickel, manganese and ozone into a single fraction the LEV must beat.

At Weir Minerals Australia, the duplex and high-chrome wet-end fabrication is the most safety-critical extraction circuit in the building. At KSB Australia and the valve makers welding stainless and duplex bodies, the same applies. Mild-steel fabrication (carbon-steel baseplates, structural skids) is a lower hazard — iron-oxide fume (5 mg/m³), manganese and general fume — but still requires on-tool or canopy capture; the difference is that mild-steel fume duct can sometimes be aluminised rather than 316L where no stainless welding shares the circuit. Where mild-steel and stainless welding share a fabrication bay, the whole circuit is built to the stainless Cr(VI) standard because cross-contamination of the duct and collector is unavoidable. SBKJ recommends a single 316L Cr(VI)-rated circuit for any mixed fabrication bay rather than trying to segregate by material.

6. Grinding, linishing and polishing — impeller finishing, valve seats and combustible metal dust

After casting and welding, pump and valve components are ground, linished and polished: impeller vanes and shrouds are dressed and balanced, weld beads are dressed flush, valve seats and gates are ground to a sealing finish, cast gates and risers are fettled off, and stainless and bronze surfaces are linished and polished to a final finish. Each of these is a dust-generating operation, and the dust is both a respiratory hazard and, for certain metals, a combustible-dust deflagration hazard.

The respiratory hazard depends on the material. Grinding cast iron and steel generates iron-oxide and metallic dust; grinding stainless and high-chrome irons generates a dust that can carry chromium; grinding bronze and gunmetal generates copper-bearing dust (0.2 mg/m³ fume, with the dust controlled to the metal-dust limits); fettling sand-cast components carries residual RCS (0.05 mg/m³) from adhering mould sand. Each grinding and linishing station needs LEV at the wheel or belt — a backdraught or downdraught capture hood or an on-tool extracted grinder — at 0.5 to 1.0 m/s capture velocity, into a 316L or aluminised branch at 18 to 22 m/s transport to a dust collector with cyclone pre-separation and HEPA polish.

The deflagration hazard is the issue that makes grinding-dust duct different from general dust duct. Fine aluminium, aluminium-bronze, magnesium (where light-alloy components are finished) and certain stainless and metal dusts are combustible and, when dry-collected and accumulated, present a deflagration risk under AS 3957. A dry baghouse collecting fine combustible metal dust is a deflagration vessel unless it is protected. The engineering response is the AS 3957 dust-hazard analysis: classify the dust (Kst deflagration index, minimum ignition energy), zone the area (Zone 21/22 around the collector and the station), select the collector and its explosion protection (deflagration venting per NFPA 68, or suppression and inerting per NFPA 69 where venting to a safe location is impractical), and isolate the collector from the duct so a deflagration cannot propagate back along the main. Every metre of combustible-dust duct must be conductive 316L spiral, bonded to the building earth grid (less than 1 ohm to ground) with conductive flange gaskets, so a static discharge cannot ignite the dust cloud.

Wet collection is the alternative for the most reactive dusts. Where a plant finishes significant volumes of fine aluminium or magnesium, a wet dust collector (drawing the dust into a water bath) eliminates the dry-dust-cloud deflagration risk in the collector, at the cost of a wet-sludge waste stream. The choice between dry-with-explosion-protection and wet collection is made in the AS 3957 dust-hazard analysis and drives the collector and duct specification. The SBFB-1500 spiral tubeformer with the SB-ZF1500 in-line stitch welder produces the conductive, continuously welded 316L spiral that combustible-metal-dust service demands.

7. Assembly and balancing — the cleaner zone with its own demands

The assembly and balancing area is the cleanest production zone in a pump, valve or compressor plant. Machined and finished components are brought together: impellers are mounted on shafts, bearings and seals are fitted, casings are closed, valve internals are assembled, and compressor air-ends are built up. Rotating assemblies — impellers, shaft-and-impeller assemblies, compressor rotors — are dynamically balanced on balancing machines to control vibration in service. The LEV demand here is modest compared with machining or welding, but it is not nil.

Three demands shape the assembly-area HVAC. First, general comfort and indoor-air-quality conditioning under AS 1668.2 and ASHRAE 62.1, holding a stable temperature and humidity for precision fitting and measurement work and for operator comfort. Assembly often shares a building volume with machining, so the make-up air for the machining LEV passes through and conditions the assembly area. Second, localised solvent and adhesive capture — assembly uses thread-sealants, anaerobic retaining compounds, gasket adhesives and cleaning solvents, each a small VOC source that may need a bench-level LEV branch where used in volume. Third, where seal-face lapping or light grinding is done at assembly, a small dust LEV branch handles the fine abrasive and metal dust. The supply-air ductwork serving the assembly area is conventional galvanised spiral to AS/NZS 4254 medium pressure, with the precision-measurement and metrology area held at a controlled temperature for dimensional stability. The assembly area is the natural location for the final-inspection and dispatch staging, and is kept at slight positive pressure relative to the machining, welding and foundry zones to keep their dust and fume out.

8. Coating and painting — epoxy, two-pack polyurethane, FBE and the isocyanate hazard

Finished pumps and valves are protected against corrosion with epoxy primers, two-pack polyurethane top-coats, and — for water-utility valves and pipeline fittings — fusion-bonded epoxy (FBE) powder coating. The paint shop is one of the two highest-regulation zones in a fluid-handling plant (the other being the foundry), and the dominant hazard is isocyanate.

Two-pack polyurethane top-coats and many high-build primers cure with isocyanate hardeners — HDI (hexamethylene diisocyanate) polyisocyanate in most modern industrial polyurethanes, with TDI and MDI in some systems. Isocyanate is the killer compound in the paint shop: SafeWork Australia sets the isocyanate WES at 0.02 mg/m³, and isocyanates are potent respiratory sensitisers — once a worker is sensitised, even trace exposure triggers an asthmatic response, and the condition can end a working career. Alongside isocyanate, solvent-borne coatings release xylene (80 ppm), toluene (50 ppm) and a family of aromatic and ketone solvents as VOC.

The control is a purpose-built spray booth or spray room with engineered airflow. A downdraught booth pulls air from a filtered ceiling plenum down past the operator and the work to a floor or pit extract; a cross-draught booth pulls air horizontally past the work to a back-wall extract. Face velocity through the booth working zone is 0.4 to 0.5 m/s, enough to carry overspray and solvent vapour away from the operator’s breathing zone and into the extract. Overspray is arrested by dry panel filters or a water-wash arrestor before the air is discharged to atmosphere or passed to a VOC-abatement stage (regenerative thermal oxidiser or carbon adsorber where the solvent load and the EPA licence demand it). The booth and its extract duct are a flammable-atmosphere envelope under AS 1940 and AS/NZS 60079, requiring Ex-rated extract fans, Ex-rated lighting and Ex-rated electrical equipment in and around the spray zone, with the zone boundary documented to AS/NZS 60079.10.1. Even with engineered LEV, spray painters wear supplied-air respirators selected to AS/NZS 1715/1716, because isocyanate at 0.02 mg/m³ cannot be reliably beaten by booth ventilation alone during active spraying.

FBE powder coating of water-utility valve bodies adds a combustible-powder circuit. The valve body is pre-heated and electrostatically coated with epoxy powder, which fuses and cures on the hot surface; the oversprayed powder is a combustible dust under AS 3957. The FBE booth has its own powder-recovery cyclone and cartridge filter with deflagration protection (NFPA 68 venting or NFPA 69 suppression) and a conductive, bonded recovery duct. The cure of the FBE coating in the post-coat oven falls under AS 1375. The fresh-air supply to every booth must be tempered and balanced under AS 1668.2 so that the booth airflow and capture velocity hold across the spray cycle — an unbalanced booth either starves and lets overspray escape, or over-draws and disrupts the spray pattern. AVK Australia and the other water-utility valve makers run substantial FBE lines; the general-industrial pump and valve makers run liquid epoxy and polyurethane booths. SBKJ fabricates the overspray-extract and powder-recovery duct in galvanised or stainless with the Ex-rated connections and bonded construction these zones require.

9. Heat treatment and stress-relief furnace exhaust

Heat treatment is a routine step in fluid-handling-equipment manufacture. Welded fabrications are stress-relieved (post-weld heat treatment, typically 600 to 700 degrees C for carbon and low-alloy steel) to relax residual welding stress and prevent distortion and cracking in service. Stainless and duplex fabrications are solution-annealed (1000 to 1100 degrees C) to restore corrosion resistance after welding. High-chrome white irons for slurry-pump wear parts are hardened and tempered to develop their carbide microstructure. Compressor crankshafts and gears may be induction-hardened or carburised. Each of these runs through a furnace, and the furnace heating system and exhaust fall under AS 1375 and AS 1668.2.

The exhaust topology depends on the furnace type. A fuel-fired furnace (natural gas or LPG) generates flue gas containing carbon monoxide (30 ppm WES in the workplace), carbon dioxide, nitrogen oxides and combustion moisture, leaving the furnace hot. The flue and exhaust are refractory-lined or 309/310S high-temperature stainless for the first few metres while the gas is hot, transitioning to 316L stainless cooling sections and then to aluminised steel or 316L for the cooled bulk run to the discharge stack or baghouse. An electric-resistance or induction furnace has no combustion products, so its exhaust is a simpler heat-and-fume extract, but it still needs LEV to capture the fume and heat released when the hot work is removed from the furnace and during any quench. A reducing-atmosphere furnace (using a protective gas such as a nitrogen-hydrogen blend to prevent scaling) adds an explosive-gas concern that links the AS 1375 furnace design to AS/NZS 60079 hazardous-area zoning around the furnace and its exhaust, with the protective-gas burn-off captured and managed.

The quench station — oil, polymer or water quench tanks where hardened parts are rapidly cooled — is a distinct HVAC source. An oil quench generates oil mist and smoke (and is a significant fire-load and AS 1940 flammable-liquid station), captured at the tank by a side-draught or canopy hood into an oil-mist collector. A polymer or water quench generates steam and aerosol, captured similarly into a mist eliminator. The SBPC1500 plasma cutter fabricates the 309/310S and Inconel 625 high-temperature transitions, refractory-anchor stud plates and bellows-flange details at the furnace; the SBAL-III heavy-gauge auto duct line forms the cooled exhaust mains; and the SBSF-1525 produces the fire-rated risers where the exhaust crosses fire compartments. Thermal-growth management is critical on furnace exhaust: a 30 m run of 309/310S stainless can grow around 300 mm between ambient and 1000 degrees C, so engineered bellows expansion joints are placed at calculated intervals to prevent the duct from buckling or tearing its supports.

10. Hydrostatic and performance test-rig exhaust

Every finished pump, valve and compressor is proof-tested before it leaves the plant, and the test bay is a significant and often under-estimated HVAC load. Two kinds of testing dominate. Hydrostatic (pressure) testing fills the pressure boundary — pump casing, valve body, compressor receiver — with water and pressurises it to prove its integrity. Performance (or string) testing runs the complete machine: a pump is run on a recirculating water test loop to verify its head-flow curve, a valve is flow- and seat-leak-tested, and a compressor is run at full load to verify its capacity and to run-in the package.

The HVAC demand from the test bay has three components. First, water mist and aerosol: hydrostatic testing and running pumps on a recirculating loop throw off water mist, captured at 0.5 to 1.0 m/s over the rig and carried in 316L stainless or aluminised duct at 10 to 15 m/s (mist, not abrasive dust) to a mist eliminator and drain. Second, and dominant, motor and prime-mover heat rejection: performance-testing a pump or compressor at full load dumps the entire absorbed shaft power into the test cell as heat. A test cell running a 500 kW pump or a large compressor is rejecting hundreds of kilowatts of heat, and the cell needs high-volume tempered make-up air under AS 1668.2 and ASHRAE 62.1 plus dedicated heat extraction to hold a workable cell temperature — the HVAC for a test cell is sized to the absorbed-power heat load, not to the building volume. Third, combustion products and noise where a diesel or gas prime mover drives the test rig (used for engine-driven pump packages and some compressor tests): the exhaust carries carbon monoxide (30 ppm) and CO2 (5000 ppm) requiring dedicated engine-exhaust extraction, and the noise of a full-load pump or compressor drives acoustic-lined duct, silencers and attenuators so the test-cell noise does not breach the plant’s occupational-noise and environmental-noise limits.

Weir Minerals runs a large slurry-pump test floor at Artarmon NSW where big mining pumps are run at full duty; KSB at Bundamba QLD tests industrial and mining pumps; Southern Cross Pumps at Toowoomba QLD tests rural and irrigation pumps; and Atlas Copco and Champion/CAPS run compressor test cells where the heat-and-noise load is the defining HVAC challenge. The make-up air for a test cell must be tempered — in a Toowoomba or Brisbane summer the incoming air is already hot, and in a Melbourne winter it needs heating — and balanced so the cell holds a slight negative pressure relative to the surrounding plant, keeping test-bay mist and noise contained. SBKJ fabricates the high-volume make-up, heat-extraction and acoustic-lined duct on the SBAL-III heavy-gauge line, with the SBTF spiral and flange family for the large round mains a test cell’s air volumes demand.

11. Slurry-pump rubber-lining cure — solvent adhesive and vulcanising fume

Slurry pumps are lined with rubber to resist the abrasive wear of mining slurry, and rubber lining is a specialised process with its own HVAC envelope. The Weir Minerals Warman range built at Artarmon NSW is the Australian exemplar — the wet-end components (casing liners, throatbushes, impellers) are lined with natural and synthetic elastomers selected for the slurry duty. The lining process has two stages, each with its own contaminant.

The lay-up stage applies uncured rubber sheet and a solvent-based contact adhesive to the prepared metal component. The solvent — toluene, xylene (80 ppm WES) and other aromatic and aliphatic solvents in the adhesive — flashes off during application, creating a flammable-vapour envelope. The lay-up bench is therefore an AS 1940 flammable-liquid station with AS/NZS 60079 hazardous-area zoning around the application area and a dedicated LEV branch at the bench drawing solvent vapour away from the operator at 0.5 to 1.0 m/s capture velocity. The duct is 316L stainless to a VOC abatement or carbon-adsorber stage, and all electrical equipment in the lay-up zone is Ex-rated.

The cure (vulcanising) stage cures the lined component in an autoclave or oven at 140 to 160 degrees C to cross-link the rubber and bond it to the metal. The cure releases a complex rubber-cure fume — cure-system volatiles, residual solvent driven off by the heat, and rubber-degradation products. This fume is captured at the autoclave or oven and carried in 316L stainless duct to a thermal oxidiser or activated-carbon adsorber before discharge to atmosphere. The cure oven or autoclave heating system falls under AS 1375; the exhaust dilution falls under AS 1668.2. The engineering priority shifts between the two stages: during lay-up, the priority is solvent-vapour control and explosion safety; at the autoclave, the priority is cure-fume capture and odour and emission control to satisfy the state EPA licence. Rubber lining is a defining process for the slurry-pump sector and a niche but important HVAC demand that a generic fabricator rarely understands — SBKJ fabricates the solvent-rated and cure-fume 316L duct to the corrosion, temperature and flammable-atmosphere requirements the process sets.

12. Non-destructive testing — dye penetrant, radiography and ultrasonic

Pump, valve and compressor pressure boundaries and critical castings are inspected by non-destructive testing (NDT) before despatch, particularly for mining, water-utility, fire-protection and process-industry duty where a failure has serious consequences. The common NDT methods in a fluid-handling plant are dye-penetrant inspection (DPI), radiography (X-ray or gamma), ultrasonic testing (UT) and magnetic-particle inspection (MPI), each with its own minor HVAC demand.

Dye-penetrant inspection is the dominant NDT-related HVAC source. A penetrant dye is applied to the component, the excess is removed with a solvent cleaner (often a hydrocarbon or ketone solvent), and a developer is applied to draw the dye out of any surface-breaking defect. The solvent cleaner and the aerosol developer release VOC, captured at the inspection bench by a dedicated LEV branch in 316L stainless to a carbon adsorber, with the bench treated as a small AS 1940 flammable-liquid station where solvent-based products are used in volume. Magnetic-particle inspection on a wet bench uses an oil or water carrier with magnetic particles; the fine iron-oxide particle mist is captured by a bench LEV branch. Radiography is performed in a shielded enclosure (lead or concrete) under the relevant state radiation-safety regulation; the HVAC role is general conditioning of the enclosure and operator area rather than contaminant capture, and where gamma or X-ray generates ozone the enclosure exhaust includes ozone management. Ultrasonic testing uses a couplant gel and has essentially no airborne-contaminant demand. The NDT area as a whole is one of the cleaner production zones, conditioned for instrument stability and operator comfort under AS 1668.2.

13. Hazardous-area classification across the fluid-handling plant

Hazardous-area classification under AS/NZS 60079 is the safety backbone that ties the whole plant’s ductwork together, because several zones in a pump, valve or compressor plant develop flammable or explosible atmospheres. The classification exercise — walking the plant against AS/NZS 60079.10.1 (gas and vapour) and AS/NZS 60079.10.2 (dust) and documenting every zone boundary — must be done before the ductwork and its fans, motors and sensors are specified, because the zone classification dictates which electrical equipment may be installed and how the duct must be bonded.

The gas and vapour zones cluster around solvents. The spray-booth interior during spraying, the immediate volume above a solvent-adhesive lay-up bench, and the immediate volume above an open solvent or parts-wash bath are Zone 1 (flammable atmosphere likely in normal operation). The general paint-shop and degreasing-area volumes are Zone 2 (flammable atmosphere unlikely, short duration). The fuel-gas trains feeding furnaces are managed under AS 1375 and the gas-installation standards with their own zoning around relief and vent points.

The dust zones cluster around dry-dust collection. The immediate area around an FBE powder-coat booth and recovery cyclone, and the immediate area around a combustible-metal-dust linishing or polishing station and its collector, are Zone 21 (explosible dust occasionally present in normal operation). The general grinding and finishing room is Zone 22 (explosible dust unlikely, short duration). The interior of a combustible-dust collector and the interior of the duct carrying combustible dust above settling velocity are the most hazardous — treated as Zone 20 (explosible dust continuously or frequently present) in the dust-hazard analysis.

Within any classified zone, the ductwork must be electrically conductive and continuously bonded to the building earth grid, with conductive flange gaskets at every joint and an external bonding strap, so that a static charge cannot accumulate and discharge to ignite the flammable atmosphere or dust cloud. Fans, motors, dampers, lighting and any duct-mounted sensor in or near the zone must carry the appropriate Ex protection. Earth-resistance verification (less than 1 ohm to ground at every section) is part of commissioning and is repeated at the periodic AS/NZS 60079.17 inspection. SBKJ builds the conductive 316L duct and supplies the bonding details that the hazardous-area classification demands; the operator’s electrical contractor selects the Ex-rated equipment to match the documented zones.

14. Combustible metal dust — deflagration protection for grinding and FBE circuits

Combustible metal dust is the most serious explosion hazard in a fluid-handling-equipment plant, and it deserves a dedicated engineering treatment because the consequences of getting it wrong are catastrophic. The dusts of concern are fine aluminium and aluminium-bronze (light-alloy pump and compressor components), magnesium (where magnesium-alloy parts are finished), certain stainless and high-chrome dusts, and the FBE epoxy powder used to coat valves. When any of these is dry-collected and allowed to accumulate as a dust layer, and a dust cloud forms in the presence of an ignition source, a deflagration (and potentially a secondary explosion as the blast lofts accumulated dust) can result.

The AS 3957 dust-hazard analysis is the governing exercise. For each combustible-dust collection point it establishes the dust’s deflagration index Kst (the rate of pressure rise, which determines the violence of an explosion and the size of the protection required), the minimum ignition energy (how easily a spark or static discharge ignites it), the minimum explosible concentration, and the layer-ignition temperature. From those properties the protection chain is engineered. Deflagration venting (cross-referenced to NFPA 68) provides a weak panel on the collector that bursts and vents the explosion pressure to a safe outdoor location. Explosion suppression and inerting (cross-referenced to NFPA 69) injects a suppressant or maintains an inert atmosphere to prevent or extinguish a deflagration where venting to a safe location is impractical. Explosion isolation — a fast-acting valve, a chemical-isolation barrier or a rotary-valve choke between the collector and the inbound duct — prevents a deflagration in the collector from propagating back along the duct main into the workshop, which is the mechanism of the most destructive dust-explosion incidents.

The ductwork’s role in this chain is threefold. It must be conductive and bonded so it cannot be the ignition source (static discharge). It must hold transport velocity (18 to 22 m/s) with no horizontal dead-legs or dropout pockets where a combustible dust layer can accumulate inside the duct. And it must be the right strength and geometry to either contain or safely relieve a deflagration depending on the protection strategy. Spiral round duct is preferred for combustible-dust service because its streamlined cross-section resists dropout and its round form resists deflagration pressure better than a flat-panelled rectangular duct. The SBFB-1500 spiral tubeformer with the SB-ZF1500 in-line continuous TIG stitch welder produces the conductive, continuously welded, bonded 316L spiral that combustible-metal-dust and FBE service demands, with the explosion-isolation device fitted at the collector by the dust-collection specialist to the AS 3957 analysis.

15. Dilution, capture and transport — the WES-driven sizing calculation

HVAC sizing in a fluid-handling plant is driven by two velocity calculations — capture velocity at the contaminant source and transport velocity in the main carrying the contaminant to the collector — both anchored to the SafeWork Australia WES and the AS 1668.2 dilution provisions. The discipline is to size every branch to capture its contaminant at the source, and the main to carry the combined load without dropout, while keeping the operator breathing-zone concentration below the WES.

Capture velocity is the air velocity at the contaminant source needed to draw the contaminant into the hood faster than thermal buoyancy, mechanical throw and cross-drafts can carry it past the operator’s breathing zone. The practical ranges in a fluid-handling plant are: machining oil-mist enclosure aperture 0.3 to 0.5 m/s; welding arc (on-tool and canopy) 0.5 to 1.0 m/s; grinding and linishing wheel/belt 0.5 to 1.0 m/s; foundry shakeout and sand handling 1.0 to 1.5 m/s (heavy, fast-moving dust); spray-booth working zone 0.4 to 0.5 m/s; rubber-lining lay-up bench 0.5 to 1.0 m/s; test-rig water mist 0.5 to 1.0 m/s; NDT bench 0.5 m/s. Capture velocity falls off rapidly with distance from the hood (roughly with the square of the distance for a plain opening), which is why on-tool and close-coupled capture is so much more effective than a distant canopy — a hood at twice the distance needs four times the airflow for the same capture.

Transport velocity is the minimum velocity in the duct that keeps the contaminant entrained without dropping out and accumulating. The ranges are: metal and foundry dust 18 to 22 m/s (below about 15 m/s fine dust drops out at horizontal elbows and accumulates as a combustible or fouling deposit); grinding and linishing dust 18 to 22 m/s; welding fume and metallic particulate 15 to 20 m/s; oil mist and coolant aerosol 8 to 12 m/s (aerosol does not settle, so a lower velocity is adequate and saves fan power); solvent and isocyanate vapour 5 to 10 m/s (vapour, no particulate dropout); rubber-cure and VOC fume 8 to 12 m/s; test-rig water mist 10 to 15 m/s. Each branch is sized at its design transport velocity; the main is sized for the simultaneous load of all connected branches at their design coincidence factor — a machining LEV main might assume only 60 to 70 percent of machines extracting at peak, whereas a welding-fume or continuous-process main assumes 100 percent coincident load.

The dilution calculation under AS 1668.2 sets the make-up air. Total extract from all LEV branches plus general exhaust must be balanced by tempered, filtered make-up air, with the production zones held at the intended pressure relationship to the office, laboratory and assembly areas. Where a contaminant cannot be fully captured at the source, AS 1668.2 dilution ventilation reduces the residual general-area concentration below the WES, but dilution is always the fallback — source capture is always the primary control because dilution requires far more air (and far more conditioning energy) to achieve the same breathing-zone result. The additive-mixture rule governs any zone with multiple contaminants: the sum of each contaminant’s concentration divided by its WES must be below one, which at a duplex welding bay (Cr(VI), manganese, nickel, ozone together) forces the LEV to beat the most stringent fraction, almost always the Cr(VI) at 0.0003 mg/m³.

16. Material selection — why galvanised fails and what replaces it

Galvanised duct is the workhorse of HVAC fabrication. Across data centres, commercial towers, hospitals and schools, hot-dip-galvanised carbon-steel sheet to AS/NZS 4254 is the right answer for the great majority of duct work. In a pump, valve or compressor plant it is the wrong answer for most of the process-extract duct, for reasons that mirror the hazard tree set out above.

16.1 Galvanised carbon steel — the failure modes in fluid-handling manufacturing

Galvanised carbon steel fails in fluid-handling-plant extract for four reasons. First, temperature: zinc fumes above about 250 degrees C service and volatilises above 419 degrees C, so heat-treat, stress-relief, melt and rubber-cure furnace exhaust all approach or exceed the safe service temperature of galvanising. Second, oil and fire-load: oil-mist duct accumulates a film of combustible oil on the galvanised surface, and an oil-mist fire can run the length of the run; galvanised offers no advantage and the oil attacks the coating over time. Third, chemical attack: chlorinated and sulphurised cutting-oil breakdown products, paint solvents, rubber-lining adhesive solvents, and any acid passivation attack the zinc directly. Fourth, conductivity and bonding: AS 3957 and AS/NZS 60079 combustible-dust and flammable-vapour ductwork must be continuously conductive with low resistance to ground, and the galvanising surface oxide raises contact resistance at flange joints and compromises the earth-bonding integrity that prevents static-discharge ignition.

16.2 316L stainless — the fluid-handling workhorse

316L stainless is the dominant material across the process-extract duct in a pump, valve or compressor plant. Composition Cr 16 to 18 percent, Ni 10 to 14 percent, Mo 2 to 3 percent and C 0.03 percent maximum gives the corrosion resistance, weldability, cleanability and conductivity that match the demand. 316L withstands oil-mist and cutting-oil service without corroding, resists the Cr(VI)-laden welding-fume stream, tolerates paint-solvent and rubber-adhesive solvent vapour, takes a continuous TIG weld for an oil-tight and dust-tight seam, and gives consistent earth-bonding resistance below 1 ohm with the right flange gasket. The SBAL-V auto duct line with the stainless option produces 316L rectangular duct at 4 to 6 m/min on 1.0 mm gauge; the SBFB-1500 spiral tubeformer produces 316L round duct from 80 mm to 1500 mm diameter; the SBSF-1525 longitudinal stitch welder lays the continuous TIG bead that makes the seam hermetic for oil-mist, Cr(VI) and combustible-dust service.

16.3 309/310S high-temperature stainless and Inconel 625

For exhaust temperatures above 600 degrees C continuous — the hot section of heat-treat, stress-relief, anneal and integrated melt-furnace exhaust — 316L exceeds its safe service temperature and creep becomes a concern. 309/310S high-temperature stainless (Cr 22 to 25 percent, Ni 12 to 20 percent) extends service to around 1100 degrees C continuous. Inconel 625 (a nickel-base superalloy, Ni about 58 percent, Cr 20 to 23 percent, Mo 8 to 10 percent) extends further to around 1200 degrees C with excellent oxidation resistance. The SBPC1500 plasma cutter handles both alloys up to 25 mm thickness; the SB-ZF1500 longitudinal stitch welder deposits ER309L or ERNiCrMo-3 filler on the matching seam. The first few metres of any furnace exhaust riser are built in 309/310S or Inconel 625 with bellows expansion joints sized for the thermal growth.

16.4 Aluminised steel and FRP — the supporting materials

Hot-dip aluminised steel — carbon steel coated with an aluminium-silicon alloy — serves the medium-temperature exhaust between the high-temperature stainless section and the collector or stack inlet (service to 400 to 600 degrees C, good resistance to mildly acidic flue gas), and serves mild-steel-only welding-fume and general dust mains where no stainless or corrosive stream shares the circuit. It is significantly cheaper than 316L and is the practical choice for the cooled bulk-length of furnace exhaust and for non-corrosive dust mains. For any acid-mist exhaust (acid passivation or pickling of stainless components), where even 316L is attacked slowly, FRP fibreglass-reinforced plastic with a vinyl-ester or furan resin is the preferred material, built to AS/NZS 4254 with a conductive interior coating where AS/NZS 60079 hazardous-area zoning is in effect.

17. Australian operator deep dives

17.1 Davey Water Products and Onga — Scoresby VIC, volume pump manufacturing

Davey Water Products at Scoresby VIC is one of Australia’s best-known pump manufacturers, building domestic, rural, firefighting and light-commercial pumps and water-system products, with the Onga brand covering pool, spa and household pumps. The manufacturing model is high-volume CNC machining and assembly of cast and moulded components. The dominant HVAC stack at a volume pump plant like Davey is machining oil-mist LEV across multiple machining cells, general dilution and make-up air to AS 1668.2, assembly-area conditioning, and a coating line for the cast-iron and steel pump bodies. The SBKJ machine fit centres on the SBAL-V with the stainless option (316L oil-mist LEV duct), the SBSF-1525 (continuous oil-tight seam), the SBFB-1500 (round dust mains for any grinding and finishing), and the SBAL-III for the heavier coating-booth and make-up-air duct.

17.2 Weir Minerals Australia — Artarmon NSW, Warman slurry pumps for mining

Weir Minerals Australia at Artarmon NSW builds the Warman slurry-pump range, the dominant Australian mining slurry pump, supplying iron-ore, coal, gold, copper and mineral-processing operations across WA, QLD, NSW and SA. The manufacturing model is heavy — casting or sourcing high-chrome white-iron and elastomer wet-end parts, fabricating bases and structures, rubber lining the wet-end components, machining, assembly and a large performance test floor. The HVAC stack is the most diverse of any operator in this guide: Cr(VI)-rated welding-fume capture on duplex and chrome-iron fabrication, rubber-lining solvent and cure-fume extraction, combustible-and-abrasive grinding-dust collection on the very hard white-iron wear parts, machining oil-mist LEV, and a high-volume test-floor heat-and-mist extraction sized to the absorbed power of big mining pumps. The SBKJ machine fit spans the full line — SBAL-III heavy-gauge for the test-floor and fabrication-bay mains, SBFB-1500 and SB-ZF1500 for the conductive welded grinding-dust spiral, SBSF-1525 for the Cr(VI) and solvent hermetic seams, and SBPC1500 for custom canopy and transition geometry over the fabrication and rubber-cure equipment.

17.3 KSB Australia — Bundamba QLD, industrial and mining pumps

KSB Australia at Bundamba QLD manufactures and services industrial, water-utility, building-services and mining pumps and valves. The Bundamba operation combines machining of pump and valve bodies, fabrication of bases and pressure boundaries (including stainless and duplex for corrosive and slurry duty), assembly, coating and pressure and performance testing. The HVAC stack combines machining oil-mist LEV, Cr(VI)-rated welding-fume capture on the stainless and duplex fabrication, coating-booth isocyanate and solvent extraction, and hydrostatic and performance test-bay extraction. The SBKJ machine fit centres on the SBAL-V (316L machining LEV), SBSF-1525 (Cr(VI) and oil-tight seam), SBFB-1500 (grinding-dust spiral), and SBAL-III (test-bay and coating-booth mains).

17.4 Southern Cross Pumps & Irrigation — Toowoomba QLD, rural and irrigation

Southern Cross Pumps & Irrigation at Toowoomba QLD builds windmill, turbine, centrifugal and irrigation pumps with a long history serving the rural and agricultural market. The manufacturing model combines casting (or sourced castings), machining, fabrication, assembly and test. The HVAC stack is dominated by machining oil-mist LEV, foundry or casting-finishing dust where bodies are cast, welding-fume capture on fabricated components, and a coating line. The Toowoomba climate adds a tempered-make-up-air demand on the test bay and coating shop. The SBKJ machine fit centres on the SBAL-V, SBFB-1500, SBSF-1525 and SBAL-III.

17.5 Grundfos, Xylem (Lowara), Pentair, Kelair, Brown Brothers and Flowserve

Grundfos Australia, Xylem (with the Lowara pump brand), Pentair, Kelair Pumps, Brown Brothers Engineers and Flowserve Australia all run pump manufacturing, assembly, packaging and service operations across Melbourne, Sydney, Brisbane, Perth and Adelaide, serving water infrastructure, building services, mining and the process industries. Some assemble and package imported hydraulic ends with locally fabricated bases and controls; others machine and fabricate locally. The common HVAC demands are machining oil-mist LEV where machining is done in-house, welding-fume capture (Cr(VI)-rated where stainless and duplex are fabricated) on baseplates and skids, coating, and pump test. Each plant’s SBKJ machine fit is scaled to its mix of in-house machining, fabrication and assembly, with the SBAL-V and SBFB-1500 as the core machines for the oil-mist and dust circuits.

17.6 AVK, Tyco/Johnson Controls, Bürkert, Cla-Val, Crane and Reliance Worldwide — valves and fittings

The valve and fitting makers run a distinct manufacturing model. AVK Australia builds water-utility valves and fire hydrants; Tyco and Johnson Controls build fire-protection and building-services valves; Bürkert builds process-control and solenoid valves; Cla-Val builds automatic control valves; Crane builds industrial and specialty valves; and Reliance Worldwide (RWC) in Brisbane builds plumbing fittings and the SharkBite push-to-connect range at very high volume. Valve plants combine CNC machining of bodies, gates, seats and trim, welding and fabrication where applicable, coating (FBE powder coating is standard on water-utility valves, liquid epoxy and polyurethane on others), and pressure and seat-leak testing. The HVAC stack is dominated by machining oil-mist LEV, FBE combustible-powder and liquid-coating LEV, and the test bay. The SBKJ machine fit centres on the SBAL-V (316L machining LEV), the SBFB-1500 (FBE powder-recovery and finishing-dust spiral), and the SBSF-1525 (oil-tight and coating-exhaust seams), with the conductive bonded construction the FBE combustible-powder circuit requires.

17.7 Atlas Copco and Champion/CAPS — compressors and the test-cell heat load

Atlas Copco and Champion (distributed and packaged in Australia through CAPS Australia and others) build and package rotary-screw and reciprocating air compressors and the associated air-treatment equipment. The Australian operations combine machining and assembly of compressor air-ends, packaging of the compressor with its motor, cooler, receiver and controls onto a skid or into an enclosure, and full-load performance and run-in testing. The defining HVAC challenge is the compressor test cell: running a large compressor at full load rejects its entire absorbed power as heat and generates substantial noise, so the test cell needs high-volume tempered make-up air, dedicated heat extraction, and acoustic-lined duct and attenuators. The SBKJ machine fit centres on the SBAL-III heavy-gauge line for the high-volume test-cell make-up and heat-extraction duct, the SBTF spiral and flange family for the large round mains the air volumes demand, and acoustic treatment integrated into the duct runs.

18. The SBKJ machine line for fluid-handling-plant duct fabrication

Fabricating duct for a pump, valve or compressor plant in an Australian shop requires the right machine fit, the right process discipline and the right documentation. The SBKJ Product Catalog 2026 covers the full envelope:

SBAL-V — auto duct line with stainless option, handling galvanised and 304/316L stainless from 0.7 mm to 1.6 mm. Production rate 4 to 10 m/min depending on gauge and material. Used for the bulk of supply and general extract duct plus the 316L oil-mist and Cr(VI) LEV mains that dominate a fluid-handling plant. Forms the TDF flange in-line.

SBAL-III — heavy-gauge auto duct line for 1.6 to 2.0 mm work. Production rate 8 to 12 m/min depending on gauge. Used for heat-treat and furnace downstream exhaust, large coating-booth and test-cell make-up and heat-extraction mains, and heavy baghouse-inlet mains.

SBSF-1525 — longitudinal stitch welder for continuous TIG seam on the lock-seam joint. Travel speed 600 to 900 mm/min on 1.2 mm 316L with argon shield at 12 L/min. Used for oil-mist-tight machining LEV, Cr(VI) hermetic welding-fume mains, coating and solvent exhaust, and AS 1530.4 fire-rated risers.

SB-ZF1500 — longitudinal stitch welder for trunk-main continuous TIG seam, in-line with the SBFB-1500 spiral former. Used for combustible-metal-dust grinding and FBE mains and for sealed high-temperature exhaust above 1000 mm diameter.

SBFB-1500 — spiral tubeformer producing spiral round duct 80 to 1500 mm diameter in 0.6 to 1.5 mm galvanised, aluminised or stainless. Production rate 3 to 6 m/min on 1.2 mm 316L 800 mm diameter. Used for grinding, linishing, foundry-shakeout and FBE dust mains, and for round LEV and exhaust mains generally — the single most-used machine for fluid-handling-plant dust fabrication.

SBPC1500 — plasma cutter handling stainless and Inconel up to 25 mm thickness with HD plasma quality. Production rate about 1.2 m/min on 1.5 mm 316L, 0.8 m/min on 1.5 mm Inconel 625. Used for custom furnace and melt-canopy transitions, refractory-anchor stud plates, bellows-joint flanges and custom hood geometry over fabrication and rubber-cure equipment.

SBLR-600 — lock former producing Pittsburgh lock and snap-lock longitudinal seams. Used for rectangular duct construction with the heavy-gauge tooling set for 1.2 mm 316L oil-mist and fume service ahead of continuous welding.

SBTF-1500/1602/2020 — spiral and flange former family for trunk mains 1500 to 2000 mm diameter. Used for large test-cell make-up and heat-extraction mains, large dust trunk mains, and high-volume general extract at the biggest installations.

19. Commissioning, monitoring and measurement & verification

Commissioning duct for a fluid-handling plant is more demanding than commissioning conventional commercial HVAC, because the safety case depends on it. The compliance documentation required at handover includes pressure-test records (1.5x design pressure for 30 minutes per AS 4254), earth-bonding verification at every flange (resistance below 1 ohm to ground) for every combustible-dust and flammable-vapour circuit, conductivity verification on every flexible connection in a classified zone, NATA-certified airflow balance against the design schedule, an AS 3957 dust-hazard analysis tied to the AS/NZS 60079.10.2 zoning, an AS/NZS 60079.10.1 gas/vapour zone-classification document, and the AS/NZS 1554 weld-procedure records for the duct seam welds.

Ongoing monitoring and measurement & verification (M&V) runs on daily, weekly, monthly, quarterly and annual cycles. Daily: pressure differential across each dust and mist collector (alarm at plus or minus 25 percent of design), and CO and combustion-product monitoring at fuel-fired furnaces and test cells. Weekly: visual inspection of duct interiors at access ports for dust or oil accumulation, condition of bonding straps, and condition of conductive flange gaskets on combustible-dust circuits. Monthly: airflow balance verification at key branches, explosion-isolation-device actuation test on combustible-dust collectors, and fan-vibration measurement. Quarterly: NATA-certified breathing-zone air sampling against the WES for every operator-occupied zone — especially Cr(VI) at the welding bays, RCS at any foundry and grinding, oil mist at the machining cells, and isocyanate in the paint shop — with the data fed into the ISO 45001 OHS management system. Annual: full system pressure test, full bonding-resistance re-verification, refractory inspection at high-temperature furnace exhaust, mist-collector and dust-collector media replacement, and the periodic AS/NZS 60079.17 inspection of all Ex equipment and bonding in classified zones. Every length of duct SBKJ supplies is delivered with the mill certificate, fabrication date, pressure-test record, earth-bonding verification and AS/NZS-compliant labelling that the operator integrates into this M&V regime.

20. Industry demand, energy, access and the fluid-handling-manufacturing outlook

The Australian pump, valve, compressor and fluid-handling-equipment sector sits on a strong demand base. Water infrastructure — desalination, water recycling, pipeline renewal and flood-mitigation pumping — drives utility-pump and valve demand. The mining capital cycle in WA, QLD, NSW and SA drives slurry-pump, process-pump and valve demand, with Weir Minerals’ Warman range and KSB’s mining range at the centre. Renewables and pumped-hydro — the large pumped-hydro storage projects and the balancing infrastructure for a renewables-heavy grid — drive large-pump and large-valve demand. Building services, fire protection and HVAC plant drive Davey, Onga, Grundfos, Xylem, Tyco and AVK demand. Compressed-air demand across manufacturing, mining and process industry drives the Atlas Copco and CAPS compressor business. Each of these segments drives new and expanded manufacturing capacity, and with it new and replacement HVAC and LEV infrastructure.

Energy and sustainability are increasingly part of the HVAC brief. NCC Section J tightens the fan-power and insulation requirements on every new air-handling system. Heat recovery is a major opportunity in a fluid-handling plant: the high-volume make-up air a test cell, foundry or paint shop needs can be pre-heated (in a Melbourne or Adelaide winter) or the rejected test-cell heat recovered, using run-around coils, plate exchangers or thermal wheels, cutting the conditioning energy substantially. Green Star and NABERS ratings are increasingly sought for new industrial facilities and corporate-occupied buildings, and the HVAC design contributes to both. Where the plant building includes offices, amenities and public-facing areas, the Disability Discrimination Act and AS 1428.1 access requirements shape the layout of plant rooms and the routing of duct so that access and egress are not compromised.

Industry bodies support the sector. Pump Industry Australia (PIA) is the peak body for pump manufacturers, distributors and users, running standards, training and the Pump Industry magazine. AMTIL (the Australian Manufacturing Technology Institute Limited) serves machine-tool and manufacturing-technology suppliers and runs the Austech trade exhibition. The Ai Group (Australian Industry Group) represents broad Australian manufacturing including the fluid-handling sector. These bodies, together with Standards Australia, shape the standards and the skills base the sector relies on.

Competitive positioning for an Australian duct fabricator serving this sector comes down to capability and documentation. A generic commercial fabricator can build galvanised supply duct, but cannot economically build the oil-tight 316L machining LEV, the Cr(VI)-rated welding-fume circuit, the conductive bonded combustible-dust spiral, the high-temperature furnace exhaust and the high-volume acoustic-lined test-cell duct that a fluid-handling plant needs — and cannot supply the AS 3957, AS/NZS 60079 and AS/NZS 1554 documentation the operator’s safety case and management-system audit demand. A fabricator equipped with the full SBKJ machine line, and the process knowledge to apply it, can serve the entire sector from a single shop. That is the position SBKJ’s 2026 catalog and engineering support is built to enable, from Box Hill North VIC across every state.

21. Standards and exposure-limit reference table

The table below consolidates the standards and the key SafeWork Australia workplace exposure standards referenced across this guide, mapped to the process zone in a pump, valve or compressor plant where each is most directly applied.

Standard / limit	Scope	Plant zone applied
AS 1668.1	Fire and smoke control in air-handling systems	All zones — fire/smoke dampers, fan shut-down at compartments
AS 1668.2	Mechanical ventilation and required outdoor/make-up air	All zones — dilution and make-up air balance
AS/NZS 4254.1 / .2	Rigid and flexible sheet-metal duct construction	All duct in normal pressure ranges
AS 1530.4	Fire-resistance of building elements and duct penetrations	Fire-compartment boundaries, furnace enclosures
AS/NZS 1554.1	Welding of steel structures	Mild-steel duct seams; carbon-steel base/skid fabrication
AS/NZS 1554.6	Welding of stainless steel	316L duct seams; stainless/duplex product fabrication
AS 3957	Combustible-dust hazard areas and classification	Grinding, linishing, foundry shakeout, FBE powder
AS 1375	Industrial fuel-fired furnaces and ovens	Heat-treat, stress-relief, melt, rubber-cure, coating ovens
AS 1940	Storage and handling of flammable and combustible liquids	Paint shop, rubber-lining adhesive, solvent wash, oil store
AS/NZS 60079.10.1 / .10.2	Hazardous-area classification (gas/vapour and dust)	Paint booth, solvent benches, combustible-dust collectors
AS/NZS 60079.17	Periodic inspection of Ex installations	All classified zones — annual re-verification
AS 4024	Safety of machinery — guarding and access	Duct access ports, plant-room access
AS/NZS 1715 / 1716	Respiratory protective equipment selection and standards	Foundry, grinding (silica), Cr(VI) welding, spray painting
AS/NZS 2243.8	Fume cupboards and laboratory ventilation	Materials/metallurgical lab, passivation, dye-penetrant
NCC Section J / ASHRAE 62.1	Energy efficiency and indoor-air-quality ventilation	Whole building — fan power, insulation, outdoor air
ISO 9001 / 14001 / 45001	Quality, environmental and OHS management systems	Whole plant — duct traceability, emissions, air sampling
NFPA 68 / 69 (cross-ref)	Deflagration venting; explosion prevention by inerting/suppression	Combustible-metal-dust and FBE collectors
WES oil mist 5 mg/m³	Metalworking-fluid mist exposure limit	CNC machining cells
WES Cr(VI) 0.0003 mg/m³	Hexavalent chromium — IARC Group 1 carcinogen	Stainless/duplex welding bays
WES manganese 1 mg/m³	Manganese fume exposure limit	All welding
WES iron oxide 5 mg/m³	Iron-oxide fume exposure limit	Melt, pouring, steel welding
WES copper/bronze fume 0.2 mg/m³	Copper and bronze fume exposure limit	Bronze/gunmetal casting, machining, welding
WES RCS 0.05 mg/m³	Respirable crystalline silica exposure limit	Foundry sand, shakeout, grinding, blasting
WES isocyanate 0.02 mg/m³	Isocyanate — respiratory sensitiser	Paint shop (two-pack polyurethane)
WES xylene 80 ppm	Xylene solvent exposure limit	Paint, rubber-lining adhesive
WES ozone 0.1 ppm	Ozone exposure limit	Arc welding
WES CO 30 ppm / CO2 5000 ppm	Carbon monoxide / carbon dioxide exposure limits	Fuel-fired furnaces, test-cell prime movers

22. Compliance checklist for fluid-handling-plant duct fabrication and commissioning

A short-form compliance checklist for pump, valve and compressor manufacturing ductwork, suitable for inclusion in handover documentation:

• AS 1668.2 mechanical ventilation — design extract and make-up-air calculations documented for every zone, with the production-zone pressure relationships defined.
• AS/NZS 4254.1 sheet-metal duct construction — pressure-test certificates at 1.5x design pressure for 30 minutes on every duct branch.
• AS 1530.4 fire resistance — fire-rated penetrations certified at 250 °C/2 hour at every fire-compartment boundary, with AS 1668.1 fire/smoke dampers.
• AS/NZS 1554.1 and AS/NZS 1554.6 welding — documented weld procedures for the duct seam welds and consistency with the product fabrication procedures.
• AS 3957 dust hazard areas — documented dust-hazard analysis covering Kst, minimum ignition energy and the deflagration-protection chain for every combustible-dust circuit.
• AS 1375 industrial furnaces — combustion, purge, flame-supervision and burner-management documentation for every fuel-fired heat-treat, melt, rubber-cure and coating oven.
• AS 1940 flammable and combustible liquids — paint, adhesive, solvent and oil storage documented, bunded and segregated.
• AS/NZS 60079.10.1 / .10.2 hazardous-area classification — documented Zone 1/2 (gas/vapour) and Zone 20/21/22 (dust) maps with Ex electrical-equipment selection.
• AS/NZS 60079.17 — periodic Ex-installation inspection scheduled for every classified zone.
• AS 4024 machinery safety — duct access ports and plant-room access designed for safe inspection and cleaning.
• AS/NZS 1715 and 1716 respiratory protective equipment — PAPR and supplied-air selection documented for silica, Cr(VI) and spray-painting tasks.
• AS/NZS 2243.8 fume cupboards — documented capture velocity and exhaust path for laboratory and passivation stations.
• NCC Section J and ASHRAE 62.1 — fan power, duct insulation and outdoor-air rates documented; heat-recovery opportunities assessed.
• ISO 9001 / 14001 / 45001 — duct traceability, stack-emission control and quarterly breathing-zone WES sampling integrated into the management systems.
• NFPA 68 deflagration venting and NFPA 69 inerting/suppression — documented (cross-reference) for every combustible-metal-dust and FBE collection system.
• NATA certification — final commissioning balance and breathing-zone sampling certified by a NATA-accredited laboratory.

Compliance documentation forms the bridge between the fabricated ductwork and the operator’s ongoing regulatory obligation. Every length of ductwork SBKJ supplies to an Australian fluid-handling-equipment fabricator is delivered with mill certificate, fabrication date, pressure-test record, earth-bonding verification at every flange, and AS/NZS-compliant labelling on every section — the foundation paperwork that the operator then integrates into its ISO 45001, ISO 14001 and ISO 9001 audit pack and its AS 3957 and AS/NZS 60079 safety case.

23. Closing — SBKJ engineering support for Australian fluid-handling manufacturing

The Australian pump, valve, compressor and fluid-handling-equipment sector is investing in new and expanded manufacturing capacity on the back of water infrastructure, the mining capital cycle, renewables and pumped-hydro, and building-services demand. Every new line and every plant upgrade exposes the limits of generic commercial HVAC and demands purpose-engineered ductwork that meets the full standards stack outlined in this guide — oil-tight 316L machining LEV, Cr(VI)-rated welding-fume capture, conductive bonded combustible-dust spiral, high-temperature furnace exhaust, and high-volume acoustic-lined test-cell duct. The SBKJ Group engineering team in Box Hill North VIC is positioned to support Australian fabricators serving this sector with a combination of machine supply (SBAL-V, SBAL-III, SBSF-1525, SB-ZF1500, SBFB-1500, SBPC1500, SBLR-600, SBTF-1500/1602/2020), engineering documentation, commissioning support and ongoing technical advisory across every process zone described in this document.

We will be exhibiting at ARBS 2026 in Sydney in May with the full SBKJ machine portfolio plus reference samples covering 316L oil-mist-tight machining LEV, Cr(VI)-rated welding-fume mains, conductive combustible-dust spiral, and high-temperature furnace-exhaust transitions. Pre-show meetings with Australian pump, valve and compressor fabricators, their mechanical contractors and machine-OEM partners are scheduled across the week.