Compressed Air Systems SWMS
Safe Work Method Statement covering the key hazards and control measures for compressed air systems.
SWMS variants reference your state’s WHS legislation. Instant download after payment.
Compressed air systems in HVAC and industrial plant environments operate at pressures commonly between 700 kPa and 1.4 MPa, storing significant potential energy in receivers, reticulation piping, hoses and pneumatic tooling. Commissioning, modification, isolation and maintenance of these systems exposes workers to stored pressure release, hose whip, projectile fittings, noise, oil-mist aerosols and inadvertent air injection into tissue. Under WHS Regulation 2025, pressure equipment classified under AS 4343 hazard levels A-D is notifiable plant, and any work involving its installation, alteration or maintenance is High Risk Construction Work triggering a mandatory Safe Work Method Statement before work commences. The PCBU must ensure the SWMS is prepared in consultation with workers, available at the workplace, and reviewed whenever controls change or an incident occurs. This SWMS documents the task-specific hazards, hierarchy controls, isolation and lock-out procedures, competency requirements and verification steps required to meet WHS Regulation 2025 obligations and AS 4774 compressed air code compliance.
Hazards identified
7 hazards covered, sorted by priority.
Hose whip causing facial fractures, eye penetration, secondary projectile injury and potential fatality from impact trauma
Subcutaneous emphysema, embolism, blindness, tissue necrosis and surgical debridement requiring hospitalisation
Fragmentation projectiles, blast overpressure injury, fatalities, structural damage and notifiable dangerous incident under WHS Reg s35
Respiratory sensitisation, lipoid pneumonia, CO poisoning and long-term occupational lung disease in maintenance crews
Permanent noise-induced hearing loss, tinnitus and workers compensation claims under WHS Reg s56-58 noise exposure standard
Unexpected actuator movement causing crush injuries, amputation of fingers and entanglement in driven HVAC components
Full-thickness burns, ignition of nearby combustibles and dermal scarring requiring grafting and extended absence
Control measures
Hierarchy-of-controls order: elimination → substitution → isolation → engineering → administrative → PPE.
- 1Elimination — Where reticulated air is only needed intermittently, eliminate permanent pressurisation by using battery-electric tools or task-end depressurisation and bleed-down to atmosphere.
- 2Elimination — Remove condemned or unregistered air receivers from service and replace rather than repair where AS 4458 in-service inspection identifies critical wall-thickness loss.
- 3Substitution — Substitute oil-flooded compressors with oil-free scroll units in breathing-air and sensitive HVAC applications to remove aerosol and CO contamination pathways.
- 4Substitution — Replace standard blow guns with OSHA-compliant venturi nozzles limiting dead-end pressure to below 200 kPa per AS 4024 safeguarding principles.
- 5Engineering — Install pressure relief valves, rupture discs, automatic drain traps and hose whip-check restraints on every reticulation branch in accordance with AS 4041 piping code.
- 6Engineering — Fit lockable isolation valves, downstream bleed points and tagout stations at every maintenance access node to enable zero-energy verification before work.
- 7Administrative — Implement a written permit-to-work, isolation certificate and pre-start SWMS sign-on briefing reviewed daily by the HVAC supervisor and signed by all workers.
- 8Administrative — Schedule competency verification for pressure equipment work, AS 3873 in-service inspection records, and operator training documented in the project HSE plan.
- 9PPE — Issue impact-rated safety glasses to AS/NZS 1337.1, Class 5 hearing protection to AS/NZS 1270, cut-5 gloves and long-sleeve flame-retardant coveralls for compressor room entry.
- 10PPE — Provide face shields and arc-rated gauntlets when breaking pressurised joints, supplemented by respiratory protection to AS/NZS 1716 when oil-mist aerosols are detected.
Applicable Codes of Practice
Prescribes operational controls, exposure limits and emergency procedures directly applicable to commissioning and maintaining compressed air reticulation systems.
Mandates inspection intervals, hazard-level classification under AS 4343 and competent person sign-off before recommissioning of compressed air receivers.
Governs design, fabrication, testing and marking of compressed air reticulation piping including hydrostatic test pressures and material compatibility verification.
Specifies PCBU duties for isolation, lockout-tagout, guarding and inspection regimes applying to pneumatic plant during maintenance and commissioning activities.
High-Risk Construction Work triggered
Commissioning, isolating and maintaining compressed air reticulation, receivers and branch piping constitutes direct work on pressurised gas distribution under Schedule 1 trigger.
PCBU must prepare, consult workers on, and retain the SWMS for the project duration plus two years after any notifiable incident; penalties are substantial and indexed, with the current maximum following the prevailing WHS schedule.
Who this is for
- →HVAC contractors commissioning industrial compressed air plant
- →Mechanical services maintenance technicians on commercial facilities
- →Principal contractors managing pressure equipment installations
- →Refrigeration and pneumatic plant servicing companies
What you receive
- ✓Editable DOCX template — Microsoft Word compatible
- ✓State-specific WHS legislation schedule (NSW/VIC/QLD/SA/WA/TAS/NT/ACT)
- ✓Hazard register with risk ratings + hierarchy-of-control mapping
- ✓Worker sign-on register, pre-start checklist, and incident escalation flow
Worked example
On a refurbishment of a mid-rise commercial building plantroom, a mechanical services subcontractor is engaged to recommission a 1,200-litre air receiver and replace corroded discharge piping feeding pneumatic VAV actuators. At the 6:30 am pre-start brief, the leading hand opens the Compressed Air Systems SWMS on a site tablet and walks the four-person crew through the hazard register. The team identifies that stored pressure in the receiver (currently at 950 kPa) and three downstream isolation points pose the highest risk, matching the SWMS hazard line on uncontrolled release of stored pneumatic energy. Following the control sequence, the supervisor confirms the electrical isolation of the compressor at the MCC, applies personal locks and tags, opens the bleed-down valve, and verifies zero pressure on the gauge for two minutes before authorising disconnection. Each worker signs the SWMS sign-on register acknowledging the isolation certificate number and confirms PPE — impact glasses, Class 5 earmuffs and cut-5 gloves. Mid-task, the crew detects a residual 80 kPa reading at a downstream actuator branch not listed on the isolation drawing. Work stops; the supervisor amends the SWMS in the field, adds the additional bleed point as a new control entry, re-briefs the crew, and obtains fresh signatures before resuming. The amended document is uploaded to the project HSE register that evening.
Related legislation
- WHS Act 2011 (model)
- WHS Regulation 2025
- AS/NZS 5149 — Refrigerating systems; AS 1668 — Mechanical ventilation
Frequently asked questions
Do I need a SWMS for compressed air systems work?
Yes. Commissioning, isolating and maintaining compressed air receivers and reticulation piping is High Risk Construction Work under the pressurised gas piping category identified in this document, so a SWMS is legally required before work commences. The PCBU must prepare it in consultation with workers, keep it available at the workplace, and review it whenever controls change or an incident occurs.
Can I use this SWMS in Victoria or other states?
You can use it as a starting point anywhere in Australia — the template ships with a state-specific WHS legislation schedule covering NSW, VIC, QLD, SA, WA, TAS, NT and ACT. Victoria, however, operates under the OHS Act 2004 and OHS Regulations 2017 rather than the model WHS laws, so update the legislation schedule with OHS-Act equivalents and cite WorkSafe Victoria compliance material in place of the Safe Work Australia Codes of Practice.
Are the codes and standards referenced in this SWMS legally binding?
In New South Wales, the instruments flagged in this document — including the Managing the Risks of Plant in the Workplace Code of Practice and the referenced AS 4774.2 and AS 3873 requirements — are legally binding under Section 26A of the WHS Act (NSW) since 1 July 2026. Their isolation, inspection and operational practice requirements should therefore be treated as enforceable minimums, not guidance.
Does this SWMS replace plant registration or pressure equipment inspection?
No. Pressure equipment classified under AS 4343 hazard levels A-D is notifiable plant with its own registration duties, and AS 3873 requires in-service inspection and competent-person sign-off before an air receiver is recommissioned. The SWMS documents the task hazards and isolation sequence; it does not certify the vessel, issue the isolation certificate, or replace the permit-to-work system it references.
Do I need to tailor this SWMS to my site before using it?
Yes — every SWMS must be made site-specific before the pre-start brief. Record the actual system pressures, receiver capacity, isolation and bleed points, and the permit and lock-out arrangements for your site, and strike out controls that do not apply. As the worked example shows, the document should also be amended in the field when undocumented energy sources are found, with fresh signatures before work resumes.