Gas Mains Tie-In / Live Service Connection SWMS
A Safe Work Method Statement for gas mains tie-in / live service connection covering all key hazards, controls and regulatory requirements. This is classified as high-risk construction work under WHS Regulation 2025.
SWMS variants reference your state’s WHS legislation. Instant download after payment.
Gas mains tie-in covers the connection of new gas pipework into an existing gas main or distribution network — tying in a new section, branch or service to the live or isolated gas network. It is high-consequence gasfitting and civil work that combines the hazards of working on a pressurised gas main, the excavation to expose the main, the control of escaping gas during the tie-in, the ignition risk, and coordination with the gas network operator whose asset is being connected to. A tie-in fault can cause a major gas release, fire or explosion and can affect supply to other customers. This document is written on the basis that gas mains tie-in is carried out by authorised gasfitters in accordance with the gas network operator's requirements, with the excavation, gas-control and ignition hazards controlled.
Gas mains tie-in is carried out to AS/NZS 5601.1:2022 and, for distribution mains, the gas distribution network requirements and the relevant pipeline and network standards, together with the authorisation of the gas network operator. The work involves excavation to expose the main, controlled to the excavation Code of Practice with existing services located first, and the tie-in to the gas main, which may be carried out live under controlled conditions. The defining hazards are the escaping gas and the ignition risk. This document coordinates the gas-standard, network-operator, excavation, gas-control and ignition controls so the tie-in is made safely.
Hazards identified
9 hazards covered, sorted by priority.
Major fire, explosion or asphyxiation from escaping gas at the tie-in
Flash fire or explosion from an ignition source during the tie-in
Burial and crush injury from collapsing trench walls
Electrocution, service damage or release where services are not located
Uncontrolled gas release from the pressurised main during the tie-in
Supply interruption and network hazard from an incorrect tie-in
Asphyxiation or explosion where gas accumulates at the work area
Musculoskeletal injury from heavy materials and equipment
Crush and run-over injury where plant and workers are not separated
Control measures
Hierarchy-of-controls order: elimination → substitution → isolation → engineering → administrative → PPE.
- 1Administrative: carry out the tie-in in accordance with the gas network operator's requirements and authorisation, and to AS/NZS 5601.1:2022 and the relevant network and pipeline standards.
- 2Engineering: expose the main by controlled excavation to the excavation Code of Practice, with existing services located and protected first and the trench benched, battered or shored, and a SWMS for the deeper excavation.
- 3Engineering: make the tie-in with the appropriate method and equipment for a live or isolated main, controlling the escaping gas and the stored pressure so gas is not released uncontrolled.
- 4Administrative: control all ignition sources during the work — no naked flames, no electrical switching, and control of static — and use a gas detector or approved leak-detection fluid rather than a flame for leak finding.
- 5Administrative: monitor the atmosphere at the work area and excavation for accumulated gas, ventilate the area, and evacuate and re-assess if gas accumulates.
- 6Engineering: maintain plant-and-pedestrian separation around the excavation with a spotter, and use mechanical aids for heavy materials and equipment.
- 7Administrative: leak test the tie-in and confirm the connection and the network integrity before the work is completed, coordinating the supply with the network operator.
- 8Administrative: ensure the work is carried out and certified by an appropriately licensed gasfitter or plumber under the relevant state or territory gasfitting and plumbing licensing scheme, with a compliance certificate issued where required.
- 9Administrative: all workers must hold a valid White Card (General Construction Induction Training, CPCCWHS1001) before entering any construction workplace, with the gasfitting, plumbing and any confined space competencies and licences required for the work.
- 10Administrative: conduct a daily pre-start toolbox talk covering the day's work, identified hazards, isolations, required PPE and emergency procedures, and record attendance in the consultation section.
- 11Administrative: consult workers and any health and safety representatives on the work and its risks, record the consultation, and keep this document available at the workplace.
- 12PPE: eye protection to AS/NZS 1337.1, hearing protection where required, gloves appropriate to the task, and Class I or Class II safety footwear with protective toecap to AS/NZS 2210.3.
- 13Administrative: review and update this SWMS whenever the work scope changes, after any incident or near miss, when a worker or health and safety representative raises a concern, when new hazards are identified, or at minimum every 12 months.
Applicable Codes of Practice
The prevailing gas installation standard for the consumer and network tie-in, leak testing and the gas-control of the work.
The network operator's requirements and authorisation for tying into the gas main and protecting supply.
Trenching and excavation controls including support against collapse, ground assessment and existing services.
Atmospheric testing, ventilation, entry permit and rescue controls where the work involves entry into a confined space.
The risk management process and hierarchy of controls applied to the hazards of the work.
High-Risk Construction Work triggered
A gas mains tie-in is work on or near a pressurised gas distribution main, which is high risk construction work requiring a SWMS before the work commences.
Exposing and tying into a gas main commonly requires a trench deeper than 1.5 metres, which is high risk construction work requiring a SWMS before the work commences.
This is licensed gasfitting or plumbing work that, in the circumstances described, is high risk construction work — pressurised gas distribution mains or piping; and in or near a shaft or trench with an excavated depth greater than 1.5 metres — so a SWMS must be prepared before the work commences, kept readily accessible, reviewed as necessary, and given to the principal contractor if one is appointed. The work is carried out to AS/NZS 5601.1:2022 and, where applicable, the LP Gas, medical gas and pipeline standards, which are called up by the state and territory gas safety legislation, with the excavation, confined space, pressurised-gas-main or work-at-height controls applied as relevant. A failure in this work can cause a major gas release, fire, explosion or patient harm, and breaches of the gas legislation and the primary duty of care under the model WHS Act are actively enforced, with offence categories running from failure-to-comply through to reckless conduct, and the most serious breaches carrying imprisonment for individuals. Body-corporate maxima are substantial and indexed; the current maximum follows the prevailing schedule of the responsible regulator.
Who this is for
- →Authorised gasfitters tying into gas mains and distribution networks.
- →Gas network and contractor crews carrying out mains tie-ins.
- →Civil and gas contractors connecting new gas pipework to mains.
- →Gas network operators and PCBUs requiring a mains tie-in.
- →PCBU safety managers and supervisors coordinating the gas-control, excavation and ignition controls.
What you receive
- ✓Editable Microsoft Word document (.docx) fully compatible with Microsoft Word 2016 and newer, Google Docs, and LibreOffice Writer.
- ✓Title page with editable fields for PCBU name, ABN, site address, project name, principal contractor details, and document revision date.
- ✓Hazard register with the gas mains tie-in hazards — each with a documented consequence, inherent risk rating on a 5x5 likelihood-consequence matrix, hierarchy-of-control measures, and residual risk rating.
- ✓Gas mains tie-in prompts referencing AS/NZS 5601.1:2022 and the network operator requirements, an excavation and existing-services section, a live-main gas-control and ignition section, and a leak-test and network-integrity record.
- ✓Licensing and compliance-certificate prompts for the relevant gasfitting and plumbing scheme, the Type B or medical gas certification where applicable, and a respiratory protection selection and fit-test record per AS/NZS 1715 where relevant.
- ✓Worker consultation record per the model WHS Act consultation duty and a worker sign-on register (blank, expandable).
- ✓Applicable legislation and Codes of Practice schedule pre-populated for the model WHS jurisdiction with a state-variance reference table covering the harmonised states, plus Victoria.
- ✓Emergency procedure template and a revision log.
Worked example
An authorised gasfitting crew is engaged to tie a new gas service into an existing distribution main, in accordance with the gas network operator's requirements and authorisation. Existing underground services are located and protected before excavation, and the trench exposing the main is benched and shored to the excavation Code of Practice, with a SWMS prepared and plant-and-pedestrian separation maintained. The tie-in is made to AS/NZS 5601.1:2022 and the network standards with the appropriate method and equipment for the main, controlling the escaping gas and the stored pressure so gas is not released uncontrolled. All ignition sources are controlled, the atmosphere at the work area and excavation is monitored for accumulated gas, and the area is ventilated. The tie-in is leak tested and the connection and network integrity confirmed, with the supply coordinated with the network operator. The crew completes the tie-in, confirms it is gas-tight, and retains the records.
Related legislation
- Model Work Health and Safety Act — primary duty of care; the duty to consult workers; the reckless-conduct offence; and notifiable-incident provisions, as enacted in each jurisdiction.
- Model Work Health and Safety Regulations — Section 291 high risk construction work and the SWMS preparation and review duties, and the confined space, excavation and pressurised-gas provisions where applicable, as enacted in each jurisdiction.
- The gas installation standard AS/NZS 5601.1:2022, the LP Gas storage standard AS/NZS 1596, the medical gas standard AS 2896, and the relevant plumbing and drainage standards AS/NZS 3500, are called up by the state and territory gas and plumbing safety legislation, together with the Type B and medical gas certification requirements and the gas network operator's requirements where applicable.
- Gasfitting and plumbing work is licensed under each state and territory's gasfitting and plumbing licensing scheme, with Type B authorisation and medical gas certification required for that work, and compliance certification required for notifiable work.
- Victoria operates under the Occupational Health and Safety Act 2004 and the Occupational Health and Safety Regulations 2017, with the high risk construction work, confined space and excavation provisions applying in place of the model instruments.
Frequently asked questions
What is a gas mains tie-in?
A gas mains tie-in is the connection of new gas pipework into an existing gas main or distribution network — tying in a new section, branch or service to the live or isolated network. It is high-consequence gasfitting and civil work because it involves working on a pressurised gas main, with the escaping gas and ignition risk controlled, and it is carried out in accordance with the gas network operator's requirements.
Who authorises a gas mains tie-in?
The gas main is owned by the gas network operator, so the tie-in is carried out in accordance with the network operator's requirements and authorisation, by authorised gasfitters, to AS/NZS 5601.1:2022 and the relevant network and pipeline standards. The operator governs the tie-in because it affects the network and the supply to other customers.
Is a gas mains tie-in high risk construction work?
Yes. Work on or near a pressurised gas distribution main is high risk construction work, and the excavation to expose the main is also high risk construction work where it exceeds the regulated depth. A SWMS is prepared before the work commences, and the gas-control, ignition, excavation and network controls apply.
How is escaping gas controlled during a tie-in?
The tie-in is made with the appropriate method and equipment for a live or isolated main, controlling the escaping gas and the stored pressure so gas is not released uncontrolled, with all ignition sources controlled and the atmosphere monitored and ventilated. Controlling the escaping gas and the ignition sources is the defining safety requirement of the tie-in.
Is the tie-in leak tested?
Yes. The tie-in is leak tested and the connection and network integrity confirmed before the work is completed, coordinating the supply with the network operator. Leak testing confirms the tie-in is gas-tight and the network is sound, which is essential on a pressurised gas main where a leak can have major consequences.