Chilled Water Piping Installation SWMS

Chilled water piping installation involves the fabrication, hoisting, jointing and pressure testing of insulated steel, copper or HDPE pipework distributing chilled water (typically 6–12°C) between central plant, air handling units and fan coil units. The work combines hot works (brazing, welding, soldering), heavy lifting of flanged spools, working at height on plant deck access, entry into risers and ceiling voids, and handling of glycol, refrigerant transfer lines and pre-formed elastomeric insulation. Poorly controlled, the work exposes workers to burns, arc flash, structural collapse of overloaded supports, respirable crystalline silica from concrete core drilling, and acute cold or heat stress in plant rooms.

Under the Work Health and Safety Regulation 2025 (NSW), section 291 defines high risk construction work and this scope engages multiple categories, triggering the section 299 requirement that a Safe Work Method Statement be prepared before work commences. Controls are applied through the hierarchy in section 36 — eliminating hot works by using grooved mechanical couplings where feasible, engineering isolation of live services, and administrative sequencing supported by competency and PPE.

Hazards identified

12 hazards covered, sorted by priority.

Control measures

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

1. 1Eliminate hot works where possible by specifying grooved mechanical couplings (Victaulic-style) or press-fit systems for carbon steel and copper chilled water pipework; where hot works are unavoidable, isolate to a designated fabrication area away from combustibles.
2. 2Substitute oxy-acetylene brazing with electric induction brazing or press-fit jointing for copper branches to reduce ignition and hot metal ejection risk.
3. 3Isolate and de-energise all adjacent refrigerant, electrical and hydraulic services using a permit-to-work system and verified lock-out / tag-out before any cutting, brazing or tie-in; verify zero-energy state with a calibrated instrument.
4. 4Classify and manage any pit, riser or enclosed ceiling void meeting the confined space definition in accordance with AS 2865:2009 — entry permit, atmospheric testing (O₂, LEL, CO), continuous ventilation, standby person and retrieval system.
5. 5Control silica dust from slab penetrations using on-tool water suppression or H-class HEPA extraction to comply with the WES of 0.05 mg/m³ (8-hr TWA); air monitoring where exposure is reasonably foreseeable, and health monitoring under section 435 of the WHS Regulation 2025 (NSW).
6. 6Manage suspected asbestos containing material by cease-work, engagement of a licensed asbestos assessor and, where applicable, a Class A or B licensed removalist under Chapter 8 of the WHS Regulation 2025 (NSW); register review before demolition of existing insulation.
7. 7Engineer fall protection using EWPs (IPAF-trained operators) or scaffolding compliant with AS/NZS 1576 and AS/NZS 4576 in preference to ladders; ladders restricted to short-duration light-duty tasks per the Managing the Risk of Falls at Workplaces Code of Practice.
8. 8Conduct hot works under a hot work permit with a trained fire watch, minimum 2 x 9 kg dry chemical extinguishers, non-combustible welding blankets to AS/NZS 4501.2 and a 30-minute post-work watch; fire detection isolation coordinated with the building manager.
9. 9Pressure test in stages — pneumatic strength test only where hydrostatic is not practicable, using stored-energy calculations, exclusion zones and remote gauge observation per AS 4041:2006 (Pressure piping); all mechanical joints witnessed before insulation.
10. 10Manage thermal environment with rotation, hydration, cooling / warming breaks and, for prolonged plant room work, real-time WBGT monitoring aligned with the Managing the Risk of Falls and the Managing the Work Environment and Facilities Codes of Practice.
11. 11Mandatory PPE: AS/NZS 1337.1 safety eyewear (shade 5 for brazing), AS/NZS 1801 hard hat, AS/NZS 2210.3 safety footwear, AS/NZS 2161 cut-resistant gloves, AS/NZS 1715/1716 P2 respirator during drilling and insulation cutting, and AS/NZS 1800 flame-resistant clothing for hot works.
12. 12All workers hold CPCCWHS1001 (White Card); tradespersons hold relevant Certificate III (Plumbing, Refrigeration and Air Conditioning, Engineering – Fabrication); refrigerant handling licence (ARCtick) where refrigerant lines are engaged; SWMS developed in consultation with workers under section 47 of the WHS Act 2011 (NSW) and reviewed under section 302 of the WHS Regulation 2025 (NSW) whenever controls change, an incident occurs, or the work method is modified.

Applicable Codes of Practice

High-Risk Construction Work triggered

Worked example

A mechanical subcontractor is installing a new DN200 chilled water flow and return riser from the Level 3 plant room down to Level 1 fan coil units in a commercial refurbishment on George Street, Parramatta. The work requires four 150 mm core-drilled slab penetrations, EWP access to install Unistrut trapeze supports at 8 metres AFFL in the atrium, tie-in to an existing charged header (isolated and drained by others), brazing of copper branches to fan coil units in occupied ceiling voids, and a 1650 kPa hydrostatic test. The SWMS identifies HRCW under s291(f) for the riser shaft, (j) for the header tie-in adjacent to R-410A liquid line, and (p) for the plant room ambient of 38°C. Controls include grooved couplings on the main riser (eliminating hot works on DN200), press-fit copper for branches, a hot work permit with fire watch, on-tool water suppression on the core drill, EWP with harness restraint, staged hydrostatic test with 5-metre exclusion zone, and rotation with hydration for plant room work. The SWMS is signed by all four workers on shift, reviewed weekly and re-issued when the sequence changes to accommodate the fire services trade.

Related legislation

• Work Health and Safety Act 2011 (NSW)
• Work Health and Safety Regulation 2025 (NSW)
• Protection of the Environment Operations Act 1997 (NSW) — refrigerant and glycol discharge
• Ozone Protection and Synthetic Greenhouse Gas Management Act 1989 (Cth) — refrigerant handling
• Environmental Planning and Assessment Act 1979 (NSW) — construction consent conditions
• Dangerous Goods (Road and Rail Transport) Act 2008 (NSW) — transport of acetylene and refrigerant cylinders

Frequently asked questions