Laboratory Process-Gas Line Install SWMS

Laboratory process-gas line installation is the specialist work that routes, joins, pressure-tests and commissions a laboratory specialty and process-gas line and cylinder supply, connecting cylinders and manifolds and purging and leak-testing for inert, flammable and toxic gases. The dominant hazards are pressurised gas release and stored energy during testing, a flammable or toxic specialty-gas leak, asphyxiation from an inert-gas purge in an enclosed space, cross-connection or wrong-gas delivery, and falls installing high-level pipework. This SWMS covers the gas pipework, cylinders, manifolds, purging and leak-testing; it does not cover the design of the gas system, the laboratory ventilation or fume-cupboard design, or the point-of-use equipment, 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, in or near a confined space, and where a person can fall more than two metres; Victoria operates the equivalent provisions under the Occupational Health and Safety Act 2004 and Occupational Health and Safety Regulations 2017. The storage and handling of gases in cylinders follow AS 4332, the pipework, fittings, purging and leak-testing follow the gas supplier's specification, and services encountered follow AS/NZS 3000.

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 installation, purge and test.

Hazards identified

11 hazards covered, sorted by priority.

Control measures

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

1. 1Elimination: Isolate and depressurise before work, use a staged test with rated gauges, and exclude others during the test; wear eye protection.
2. 2Elimination: Eliminate ignition sources, use gas-specific fittings, leak-test, and use gas detection and ventilation, following the supplier specification.
3. 3Engineering: Ventilate and use oxygen monitoring during an inert-gas purge, and use a confined-space permit with a standby person where the space is enclosed.
4. 4Engineering: Use screens for brazing or welding, a hot-work permit and fire watch, and purge before hot work; wear flame-resistant clothing and gauntlets.
5. 5Engineering: Use an elevating work platform or scaffold with edge protection for high-level pipework, with a fall-arrest harness where a residual fall risk remains.
6. 6Engineering: Restrain cylinders and use a cylinder trolley, with secure, upright storage per AS 4332; wear gloves and footwear.
7. 7Engineering: Use gas-specific connections, with labelling, an anti-confusion check and verification before use, so the wrong gas cannot be delivered.
8. 8Elimination: Locate and isolate services, use a cable scanner, and work under permit; use insulated tools.
9. 9Engineering: Use particle-free practices, inline filters and purging; wear a respirator where dust is generated.
10. 10Elimination: Work from outside a confined plant or gas-store space where possible; otherwise ventilate and use a confined-space permit with a standby person.
11. 11Engineering: Deburr pipework, rotate operators, and wear cut-resistant gloves and hearing protection.

Applicable Codes of Practice

High-Risk Construction Work triggered

Worked example

A scientific-services contractor is installing a laboratory process-gas system, routing and joining pipework, connecting cylinders and manifolds, and purging and leak-testing lines that will carry inert, flammable and toxic gases. The work is high risk construction work because it is on, in or near pressurised gas piping, can create a flammable, toxic or oxygen-deficient atmosphere, involves a confined gas-store space, and includes high-level pipework, so the technician builds the safe work method statement around the gas hazards, the purge and cross-connection. Each line uses gas-specific fittings so the wrong gas cannot be delivered, and labelling, an anti-confusion check and verification before use guard against cross-connection. Lines are isolated and depressurised before work, pressure-tested in stages with rated gauges and an exclusion, and leak-tested with gas detection and ventilation following the supplier specification, with ignition sources eliminated for flammable gases. Where an inert gas is purged in an enclosed space, the area is ventilated and oxygen-monitored, and a confined-space permit with a standby person is used, because an inert purge can silently displace oxygen. Cylinders are stored secure and upright to AS 4332, restrained and moved on a trolley, and high-level pipework is installed from an elevating work platform with edge protection. Brazing and welding are done under a hot-work permit with screens, a fire watch and purging, services are located and isolated before contact, and inline filters and particle-free practices protect gas purity. Workers sign on to the statement before starting, the pressure-test, leak-test and gas-verification records are kept, and the signed statement is held on site for the responsible state regulator, and a review is triggered if the gases or the layout 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)
• Harmonised Work Health and Safety Regulations — Hazardous atmospheres and ignition sources: controlling work in an area that may have a contaminated or flammable atmosphere
• 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)
• State dangerous-goods requirements and AS 4332 — Storage, restraint and handling of gas cylinders, including flammable and toxic specialty gases

Frequently asked questions