Boiler Installation & Commissioning SWMS

Boiler installation and commissioning is the assembly, registration, hydrostatic testing, boil-out and cold and hot commissioning of fired and waste-heat boilers. It is high risk construction work under the WHS Regulation because it is carried out in or near a confined space, on or near pressurised gas mains and fuel lines, and in artificial extremes of temperature (s291), so a SWMS is mandatory (s299). The central hazard is the confined space: boiler shells, fireboxes, drums, headers and economiser cavities are all entered, and they can hold oxygen-deficient, oxygen-enriched or flammable atmospheres from residual fuel, dosing chemicals and refractory cure products. Layered onto that are the pressure hazards — a catastrophic boiler rupture during the hydrostatic test, or a pressure-relief device failing to open at set pressure — combustion and fuel hazards including furnace explosion during light-off and fuel-gas leaks, thermal burns from hot surfaces and steam during hot commissioning, boil-out and water-treatment chemicals, and welding fume and radiographic NDT during fabrication and repair. Boilers above the relevant AS 4343 hazard threshold require plant design registration and plant item registration, with hydrostatic testing witnessed by an Authorised Inspector. This SWMS supports the engineered and registered work to AS 1228 and AS 4343 — it does not replace the registrations, the engineer's procedures or the Authorised Inspector — and controls the confined-space, pressure, combustion, thermal and chemical envelope around it. It is supplied in eight jurisdiction editions, each citing its own Act, Regulation, regulator and plant-registration regime.

Hazards identified

8 hazards covered, sorted by priority.

Control measures

Hierarchy-of-controls order: elimination → substitution → isolation → engineering → administrative → PPE.

1. 1Elimination — Pre-fabricate, weld and inspect boiler modules off site so confined-space entry and hot work on site are minimised
2. 2Substitution — Substitute pneumatic-assisted or modular tooling for manual hot work inside the drum and shell where the design allows
3. 3Engineering — Confined space entry permit to AS 2865 with continuous atmospheric monitoring and forced mechanical ventilation in all spaces
4. 4Engineering — Hydrostatic test exclusion zone, calibrated gauges and a relief path, with the Authorised Inspector witnessing the test to 1.5x design pressure per AS 1228
5. 5Engineering — Burner management system interlocks, pre-purge and fuel-line leak testing before light-off; local exhaust ventilation on welding fume
6. 6Administrative — Plant design registration before construction and plant item registration after hydrostatic-test acceptance, with a permit-controlled commissioning sequence
7. 7Administrative — Hot-work permits, gas-fitter and electrical licensing, and a radiation-safety controlled area marked per the ARPANSA code for radiographic NDT
8. 8Administrative — Health monitoring for welding fume, lead and other triggers, and a chemical-handling procedure for boil-out and dosing chemicals
9. 9PPE — Air-supplied or appropriate respiratory protection for confined-space entry and welding fume, with a retrieval harness
10. 10PPE — Heat-resistant gloves and clothing for hot commissioning, eye and face protection, and anti-static footwear in hazardous areas

Applicable Codes of Practice

High-Risk Construction Work triggered

Worked example

At 6:00 am a commissioning crew from Thermal Dynamics begins hot commissioning a newly installed industrial steam boiler. The supervisor confirms the plant design registration is on file and the plant item registration was issued after the Authorised Inspector witnessed the hydrostatic test the week before. Before anyone enters the drum to remove blanking, it is treated as a confined space: isolated and locked out, atmosphere tested, forced ventilation running, a permit signed and a retrieval harness on the entrant with an attendant at the manway. The fuel-gas line is leak-tested and the burner management system runs its pre-purge before light-off, so no fuel can accumulate in the furnace. As the boiler is brought up to temperature, hot-surface and steam-burn controls keep the crew clear of uninsulated sections, and the relief-valve set pressure is verified. A welder repairing a small header weld works under local exhaust ventilation with fume monitoring, and the radiography contractor marks a controlled area per the ARPANSA code before shooting the weld. The boiler reaches operating pressure under the commissioning engineer's procedure with every hold point signed.

Related legislation

• WHS Act 2011 (model)
• WHS Regulation 2025
• AS 1228 Pressure equipment — Boilers
• Confined Spaces Code of Practice

Frequently asked questions