Industrial Process Piping SWMS

Industrial process piping work involves the installation, modification, repair and commissioning of pipework systems that convey pressurised gases, refrigerants, steam, thermal fluids, chemicals and fuels through manufacturing, food processing, pharmaceutical and heavy commercial facilities. The work regularly requires entry into plant rooms, pipe trenches, mezzanines and confined spaces; hot work on carbon steel, stainless and copper lines; pressure testing to elevated hydrostatic and pneumatic pressures; and interaction with live systems that may still contain residual product, stored energy or hazardous atmospheres. Failures during isolation, purging, welding or reinstatement have historically caused fatal burns, asphyxiation, chemical exposure and catastrophic pressure release.

Under section 291 of the Work Health and Safety Regulation 2025 (NSW), this scope constitutes high risk construction work on multiple grounds, and section 299 requires a Safe Work Method Statement be prepared before work commences and made available for inspection. Controls are structured against the hierarchy in section 36, with permit-to-work, positive isolation, atmospheric testing and competent supervision forming the core risk-treatment strategy.

Hazards identified

12 hazards covered, sorted by priority.

Control measures

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

1. 1Eliminate live work — require full process shutdown, drain-down and depressurisation before line breaking; verify zero energy at each isolation point using calibrated gauges before any joint is opened.
2. 2Substitute pneumatic pressure testing with hydrostatic testing wherever design permits, in accordance with AS 4041 Pressure piping; where pneumatic testing is unavoidable, apply exclusion zones and stored-energy calculations by a competent person.
3. 3Apply positive isolation using double-block-and-bleed, spectacle blinds or spool removal — never rely on a single closed valve; lock and tag each isolation under a documented permit-to-work and isolation certificate consistent with AS 4024.1603.
4. 4For all confined space entry, comply with AS 2865 Confined spaces — issue a written entry permit, conduct continuous atmospheric monitoring (O₂, LEL, CO, task-specific gases), and station a trained stand-by person with rescue equipment.
5. 5Perform hot work under a hot work permit — purge and inert lines with nitrogen to below 25% LEL verified by calibrated gas detector; remove combustibles within 11 m; post a dedicated fire watch during and for 60 minutes after work.
6. 6Control silica by wet-cutting or on-tool H-class dust extraction for concrete penetrations, in line with the SafeWork NSW Code of Practice: Managing the risks of respirable crystalline silica from engineered stone in the workplace and the model Code for construction work.
7. 7Assume asbestos on pre-2004 gaskets, lagging and millboard until proven otherwise; engage a licensed asbestos removalist under Chapter 8 of the WHS Regulation 2025 (NSW) and obtain a clearance certificate before reinstatement.
8. 8Control welding and brazing fume with local exhaust ventilation and P2/P3 respiratory protection selected under AS/NZS 1715 and AS/NZS 1716; prohibit cadmium-bearing brazing alloys where alternatives exist.
9. 9Manage falls under AS/NZS 1891 series — provide compliant edge protection, work platforms or MEWPs for all work above 2 m; harness-based systems are a last resort with documented rescue plan.
10. 10PPE baseline: FR coveralls (AS/NZS 4824), safety footwear (AS/NZS 2210.3), impact eyewear (AS/NZS 1337.1), hearing protection (AS/NZS 1270), and task-specific chemical or thermal gloves; welding PPE to AS/NZS 1338 series.
11. 11All workers hold CPCCWHS1001 (White Card); confined space entrants and stand-by hold nationally recognised confined space and gas test units; SWMS content is developed in consultation with workers under section 47 of the WHS Act 2011 (NSW) and reviewed under section 302 of the WHS Regulation 2025 (NSW) whenever controls change, an incident occurs, or work method is altered.

Applicable Codes of Practice

High-Risk Construction Work triggered

Worked example

A mechanical contractor at a food manufacturing facility in Wetherill Park is engaged to replace a section of DN150 ammonia suction pipework in a chilled plant room. The scope requires hot work adjacent to remaining live lines, entry into a below-grade pipe pit meeting the confined space definition, and pneumatic strength testing of the new spool. Before work commences the site prepares this SWMS in consultation with the welders, riggers and refrigeration technicians. Ammonia is pumped down and the isolated section is triple-blocked with spectacle blinds installed and locked. The pit is atmospherically tested for O₂, LEL and NH₃ under a confined space permit, with continuous monitoring throughout entry. Hot work is authorised under permit only after nitrogen purge readings confirm < 25% LEL. Pneumatic test pressure is calculated per AS 4041, an exclusion zone is barricaded, and non-essential personnel are cleared. The SWMS is signed by all workers, held on site, and reviewed at each shift handover.

Related legislation

• Work Health and Safety Act 2011 (NSW)
• Work Health and Safety Regulation 2025 (NSW) — Chapter 6 (Construction work) and Chapter 4 (Hazardous work)
• Work Health and Safety Regulation 2025 (NSW) — Chapter 8 (Asbestos)
• Protection of the Environment Operations Act 1997 (NSW) — for refrigerant and chemical release control
• Dangerous Goods (Road and Rail Transport) Act 2008 (NSW) — for transport of process fluids and gas cylinders
• Gas and Electricity (Consumer Safety) Act 2017 (NSW) — where work interfaces with reticulated gas installations

Frequently asked questions