LPG Cylinder Handling & Storage SWMS

Liquefied petroleum gas (LPG) cylinders are routinely transported, exchanged and stored across construction, hospitality, manufacturing and forklift refuelling operations throughout Australia. The work involves moving pressurised vessels containing a flammable, heavier-than-air gas that can pool in low areas, ignite from minor sparks and cause catastrophic BLEVE events if heat-affected. Under WHS Regulation 2025, LPG handling triggers duties for hazardous chemicals (Chapter 7), plant under pressure, manual task risk and storage of dangerous goods. A documented SWMS is mandatory because the task involves a flammable gas with potential for fire, explosion and asphyxiation, and where storage exceeds placard quantities the work falls within High Risk Construction Work and Major Hazard Facility thresholds. This SWMS captures the sequence from delivery acceptance through cage storage, exchange at point-of-use and empty return, with controls aligned to AS/NZS 1596 and the model Code of Practice for Managing Risks of Hazardous Chemicals.

Hazards identified

7 hazards covered, sorted by priority.

Control measures

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

1. 1Elimination — Where feasible, replace LPG-fuelled appliances with mains gas or electric alternatives to remove pressurised flammable cylinder handling from the workflow entirely.
2. 2Elimination — Schedule cylinder deliveries direct to point-of-use exchange cages so onsite double-handling and intermediate storage movements are eliminated from the daily task sequence.
3. 3Substitution — Specify smaller 9 kg cylinders for portable applications instead of 45 kg cylinders to reduce manual handling forces and consequence severity if dropped.
4. 4Substitution — Use vapour-withdrawal cylinders with excess flow valves and POL/Type 21 connections in lieu of liquid-withdrawal where the application permits.
5. 5Engineering — Install purpose-built ventilated storage cage to AS/NZS 1596 with minimum 3 m separation from ignition sources, drains, openings and protected by fire-rated wall or 5 m clearance.
6. 6Engineering — Provide cylinder trolleys with restraint chains, anti-tip wheels and dedicated forklift cylinder cradles eliminating manual lifting of cylinders above 18 kg.
7. 7Administrative — Display SDS, placards, emergency response procedure and manifest at the cage; restrict access via keyed lock with authorised gas handler register and competency records.
8. 8Administrative — Pre-start gas detector function check, leak test every connection with soapy water or electronic sniffer, and hot work permit exclusion zone of 6 metres around storage.
9. 9Administrative — Conduct toolbox briefing on this SWMS at shift commencement; all workers sign on, and any change to cylinder location, quantity or adjacent work triggers SWMS review.
10. 10PPE — Flame-resistant cotton drill or Nomex coveralls, AS/NZS 2210 safety boots, anti-static gloves, AS/NZS 1337 impact eye protection and escape respirator within the cage hot zone.

Applicable Codes of Practice

High-Risk Construction Work triggered

Worked example

On a regional commercial fit-out where the kitchen tenancy uses 45 kg LPG cylinders for commissioning of cooking appliances, the site supervisor opens the pre-start brief by walking three workers through this SWMS at the storage cage. The team reviews the hazard register and identifies that today's task — exchanging two empty cylinders and connecting two full — coincides with a tiler grinding floor preparation 4 metres from the cage. Using the controls section, the supervisor enforces the 6 metre hot work exclusion zone and asks the tiler to relocate or pause until the exchange is complete. The cylinder trolley is checked, restraint chain confirmed, and an electronic gas detector is bump-tested in front of the crew. Each worker signs onto the SWMS, with the new apprentice initialled against the competency note requiring direct supervision for first three exchanges. Mid-task, the supervisor notices wind direction has shifted carrying vapour toward a basement stairwell during the brief disconnect purge. The SWMS dynamic review clause is invoked: work pauses, the stairwell door is closed and weighted, a spotter is posted, and the change is annotated on the SWMS field copy. The exchange is completed, leak tests pass, and the amended document is countersigned before the cage is relocked and the manifest updated.

Related legislation

• WHS Act 2011 (model)
• WHS Regulation 2025
• Managing Risks of Hazardous Chemicals CoP; ADG Code