Commercial Gas Appliance Install SWMS

Commercial gas appliance installation is the licensed gasfitting work that connects and commissions kitchen cooking equipment, water heaters and boilers: pipework connection, flueing and ventilation, and combustion commissioning. The dominant hazards are gas leak and explosion during connection, pressurised gas release and stored energy, carbon monoxide and combustion products at commissioning, fire and burns, and electric shock connecting controls, ignition and interlocks. This SWMS covers the appliance connection, flueing, ventilation and commissioning; it does not cover the design of the gas reticulation, the supply authority's meter and main, or the kitchen mechanical exhaust design, which are documented separately.

Under the model Work Health and Safety Act 2011 and the harmonised Work Health and Safety Regulations adopted in each state and territory, this is high risk construction work because it is carried out on, in or near pressurised gas piping, in an area that may have a contaminated or flammable atmosphere, on or near energised electrical services, and in or near a confined kitchen or plant space; Victoria operates the equivalent provisions under the Occupational Health and Safety Act 2004 and Occupational Health and Safety Regulations 2017. Gas installation, testing, purging and commissioning follow AS/NZS 5601.1, the controls and interlocks follow AS/NZS 3000, and the work is carried out by a licensed gasfitter, with the electrical work by a licensed electrician.

Failure to meet the primary duty of care is prosecuted under the Category 1 to 3 offences in the Work Health and Safety Act (and the equivalent provisions in Victoria's Occupational Health and Safety Act 2004), with maximum penalties indexed in most jurisdictions, imprisonment available for individuals, and a separate industrial manslaughter offence; current figures follow the prevailing penalty schedule of the responsible state regulator. This document is structured to satisfy the safe work method statement content requirements of the harmonised regulations and documents a controlled connection and commissioning.

Hazards identified

10 hazards covered, sorted by priority.

Control measures

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

1. 1Elimination: Eliminate ignition sources, purge and leak-test with no ignition present and with ventilation, and follow the AS/NZS 5601.1 test and commissioning sequence.
2. 2Elimination: Isolate and depressurise before disconnection, use a staged test, and exclude others during the test; wear eye protection.
3. 3Engineering: Commission the flue and ventilation to AS/NZS 5601.1, run a carbon-monoxide test with adequate room ventilation, and confirm safe combustion.
4. 4Engineering: Use screens and a heat-protected zone, a hot-work permit and fire watch, and allow no ignition near gas; wear flame-resistant clothing.
5. 5Elimination: Isolate and lock out before connecting controls, test before touch, use a licensed electrician under permit, and use insulated tools.
6. 6Engineering: Use mechanical aids to position heavy appliances, with two-person handling; wear gloves and footwear.
7. 7Elimination: Work from outside a confined kitchen or plant space where possible; otherwise ventilate and use a confined-space permit where it applies.
8. 8Engineering: Store LPG cylinders secure and upright, allow no ignition and provide ventilation; wear gloves.
9. 9Engineering: Deburr sheet-metal edges and handle safely; wear cut-resistant gloves.
10. 10Engineering: Keep access clear with housekeeping; wear slip-resistant footwear.

Applicable Codes of Practice

High-Risk Construction Work triggered

Worked example

A licensed gasfitter is installing and commissioning a bank of commercial cooking appliances and a water heater in a new kitchen, connecting the pipework, flueing and ventilation and bringing the appliances into service. The work is high risk construction work because it is on or near pressurised gas piping, can create a flammable or contaminated atmosphere, involves energised controls, and is carried out in a confined kitchen space, so the gasfitter builds the safe work method statement around the gas connection, combustion commissioning and the confined space. Before any disconnection the line is isolated and depressurised, and the new pipework is purged and leak-tested with no ignition source present and with ventilation, following the AS/NZS 5601.1 test sequence. Hot work near gas is done only under a hot-work permit with screens, a fire watch and no ignition near gas, and the electrical controls, ignition and interlocks are connected only after isolation and lock-out by a licensed electrician who tests before touch. The flue and ventilation are commissioned to AS/NZS 5601.1 and a carbon-monoxide test confirms safe combustion with adequate room ventilation before the appliances are handed over. Where the kitchen or a plant space is confined, work is done from outside where possible, or under a confined-space permit with ventilation. Heavy appliances are positioned with mechanical aids and two-person handling, LPG cylinders where used are stored secure and upright away from ignition, and access is kept clear. Workers sign on to the statement before starting, the leak-test, carbon-monoxide and commissioning records are kept, and the signed statement is held on site for the responsible state regulator, and a review is triggered if the appliances, the gas type or the space change.

Related legislation

• Work Health and Safety Act 2011 (harmonised; enacted in all states and territories except Victoria, which applies the Occupational Health and Safety Act 2004), s.19 — Primary duty of care to workers and to other persons at or near the workplace
• Harmonised Work Health and Safety Regulations, section 291 — Defines high risk construction work (Victoria: Occupational Health and Safety Regulations 2017, Part 5.1)
• Harmonised Work Health and Safety Regulations, section 299 — Content and review requirements for a safe work method statement for high risk construction work (Victoria: regulation 327; Tasmania: regulation 312)
• State gas-safety legislation — Gas appliance and pipework connection must be carried out by a licensed gasfitter and pressure and leak tested
• Harmonised Work Health and Safety Regulations — Confined spaces: entry permit, atmospheric monitoring, standby and rescue duties (Victoria applies the Occupational Health and Safety Regulations 2017)
• Harmonised Work Health and Safety Regulations — Hazardous atmospheres and ignition sources: controlling work in an area that may have a contaminated or flammable atmosphere

Frequently asked questions