Pipeline Trenching & Pipe Laying SWMS
Pipeline trench excavation, shoring, dewatering, pipe stringing and lowering-in. Schedule 1 Category 4 (excavation >1.5m) and powered mobile plant. DBYD pre-clearance and live services.
SWMS variants reference your state’s WHS legislation. Instant download after payment.
Pipeline trenching and laying excavates the trench for a pipeline and lays the pipe string into it, across cross-country, road, rail and easement routes. It combines the serious hazards of deep excavation with the hazards of moving and lowering long, heavy pipe strings using cranes and sidebooms. The dominant excavation hazard is trench collapse, which can bury and kill a worker in seconds, and the dominant lifting hazard is the load — a welded pipe string is long, heavy and flexible and is lowered into the trench by multiple machines working together. Trenching also routinely encounters existing underground services, including other pipelines and cables. This document is written on the basis that the trench is engineered against collapse, the pipe-laying lift is planned and coordinated, and existing services are located and protected before excavation.
Trenching and laying is high risk construction work because it is carried out in or near a trench with an excavated depth greater than 1.5 metres, in an area with movement of powered mobile plant, and often on or near chemical or fuel lines where existing pipelines are present — so a safe work method statement is required before the work commences, kept readily accessible, and given to the principal contractor if one is appointed. Pipeline construction is carried out to the AS 2885 suite, and the excavation is controlled to the excavation Code of Practice with benching, battering or shoring as required for the ground conditions and depth. This document coordinates the trench-collapse, plant-and-pedestrian, lifting and existing-services controls so the pipe is laid without a trench failure, a plant strike or a service strike.
Hazards identified
9 hazards covered, sorted by priority.
Burial and death within seconds from collapsing trench walls
Explosion, electrocution or release where services are not located and protected
Crush and run-over injury where plant and pedestrians are not separated
Dropped or swinging pipe string causing crush and impact injury
Crush injury if the load is lowered onto or fails above workers in the trench
Fall injury into the excavation from unprotected edges
Trench failure and drowning or entrapment risk from water in the excavation
Electrocution from contact with energised services during excavation or lifting
Back and crush injury from heavy materials and awkward positions
Control measures
Hierarchy-of-controls order: elimination → substitution → isolation → engineering → administrative → PPE.
- 1Engineering: design and control the excavation to the excavation Code of Practice — benching, battering or shoring selected for the ground conditions and the depth — so the trench cannot collapse on workers.
- 2Engineering: locate, prove and protect all existing underground services, including other pipelines and cables, before excavation using plans, a service locator, potholing and, where required, hand digging near services.
- 3Engineering: a lift plan for the lowering-in, with the cranes or sidebooms, rigging and the flexible pipe string coordinated, and the load and ground conditions assessed; keep workers clear of and out from under the suspended load.
- 4Engineering: manage groundwater and surface water — dewatering and diversion — so water does not undermine the trench, and control overhead and underground electrical services along the route.
- 5Administrative: maintain plant-and-pedestrian exclusion zones with a spotter and traffic management, protect open-trench edges, and provide safe access and egress from the trench.
- 6Administrative: prepare a SWMS before the work for the high risk construction work — a trench deeper than 1.5 metres, movement of powered mobile plant, and where existing pipelines are present, work on or near chemical or fuel lines — and brief the excavation, lift and services controls.
- 7PPE: high-visibility clothing, head protection, gloves, and Class I or Class II safety footwear with protective toecap to AS/NZS 2210.3, with respiratory protection where dust or atmosphere requires it per AS/NZS 1715 and AS/NZS 1716.
- 8Administrative: all workers must hold a valid White Card (General Construction Induction Training, CPCCWHS1001) before entering any construction workplace, with pipeline and any confined space competencies verified as applicable.
- 9Administrative: conduct a daily pre-start toolbox talk covering the day's work scope, identified hazards, required PPE, emergency procedures, and any changes since the previous shift, and record attendance in the SWMS consultation section.
- 10PPE: eye protection to AS/NZS 1337.1, hearing protection where required, gloves, and Class I or Class II safety footwear with protective toecap to AS/NZS 2210.3.
- 11Administrative: review and update this SWMS whenever the work scope, pipeline conditions or method changes, after any incident or near miss, when a worker or health and safety representative raises a concern, or at minimum every 12 months.
Applicable Codes of Practice
The national code for excavation and trenching, including benching, battering, shoring, ground assessment, existing services and safe access.
The pipeline construction standard governing the laying of the pipe and the trench requirements for the pipeline.
Controls for the excavators, sidebooms and cranes used in trenching and lowering-in, and plant-and-pedestrian separation.
Safe use and design of the cranes and sidebooms used for the pipe-string lift during lowering-in.
Selection, fit testing, use and maintenance of the respiratory protection required for the atmospheric, fume and product hazards of the work.
High-Risk Construction Work triggered
Pipeline trenches routinely exceed 1.5 metres, so the work is high risk construction work requiring a SWMS before the work commences, with the trench engineered against collapse.
Excavators, sidebooms and cranes move around the trenching and laying operation, bringing the work within this category and driving the plant-and-pedestrian separation controls.
Where existing pipelines carrying gas or petroleum are present along the route, excavation on or near them is high risk construction work on that count as well.
Pipeline trenching and laying is high risk construction work on several counts — a trench with an excavated depth greater than 1.5 metres, an area with movement of powered mobile plant, and, where existing pipelines are present, work on or near chemical or fuel lines — 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. Pipeline construction follows the AS 2885 suite, and the excavation is controlled to the excavation Code of Practice with benching, battering or shoring for the ground and depth. Trench collapse and service strikes are among the most lethal construction events, and breaches of 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. Body-corporate maxima are substantial and indexed; the current maximum follows the prevailing schedule of the responsible regulator.
Who this is for
- →Pipeline construction contractors excavating trench and laying pipe strings.
- →Civil and earthmoving crews operating excavators and trenching plant for pipelines.
- →Crane and sideboom operators and riggers carrying out the lowering-in lift.
- →Pipeline construction supervisors coordinating excavation, services and the laying operation.
- →PCBU safety managers and supervisors coordinating the SWMS, the excavation controls and the lift plan.
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 pipeline trenching laying hazards — each with a documented consequence, inherent risk rating on a 5x5 likelihood-consequence matrix, hierarchy-of-control measures, and residual risk rating.
- ✓Excavation control prompts for benching, battering or shoring with ground-assessment fields, an existing-services location and protection section, and a lift plan prompt for the lowering-in with crane and sideboom coordination.
- ✓Competency verification table for the specialised roles, 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
A pipeline construction crew is excavating trench and lowering in a welded pipe string along a cross-country easement that crosses an existing buried gas pipeline and several cables. Because the trench exceeds 1.5 metres, powered mobile plant moves around the operation, and an existing pipeline is present, a SWMS is prepared and the pipeline is constructed to the AS 2885 suite. Before excavation, the existing services are located from plans and a service locator, potholed to confirm their position, and hand digging is used near them; the existing pipeline is exposed and protected. The trench is battered and, where space is constrained, shored to the excavation Code of Practice for the ground conditions and depth, and groundwater is managed by dewatering so it does not undermine the trench. A lift plan coordinates the sidebooms lowering the flexible pipe string into the trench, with the load and ground assessed and workers kept clear of and out from under the suspended string. Plant-and-pedestrian exclusion zones are maintained with a spotter, open-trench edges are protected, and safe access and egress are provided. Workers wear high-visibility clothing and the site PPE, the crew is briefed at pre-start and signs on, and the excavation, services and lift records are retained.
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, including a trench deeper than 1.5 metres, an area with movement of powered mobile plant, and work on or near chemical or fuel lines; and the SWMS preparation and review duties, as enacted in each jurisdiction.
- AS 2885.1 Pipelines: Gas and liquid petroleum (Design and construction); the excavation and plant Codes of Practice; and the crane standards AS 2550 and AS 1418 series.
- Locating and protecting existing underground services, including under any Dial Before You Dig or equivalent process, applies before excavation.
- Victoria operates under the Occupational Health and Safety Act 2004 and the Occupational Health and Safety Regulations 2017, with the high risk construction work, excavation and plant provisions applying in place of the model instruments.
Frequently asked questions
Why is a pipeline trench high risk construction work?
Because the trench routinely exceeds 1.5 metres in excavated depth, which is a high risk construction work category in its own right, and the work also involves movement of powered mobile plant and, where existing pipelines are present, work on or near chemical or fuel lines. A SWMS is mandatory before the work begins, and the trench must be engineered against collapse.
How is trench collapse prevented?
By controlling the excavation to the excavation Code of Practice — benching, battering or shoring selected for the ground conditions and the depth — and by managing groundwater so it does not undermine the trench. Trench collapse can bury and kill a worker in seconds, so the support method is engineered for the conditions rather than assumed, and safe access and egress and protected edges are provided.
How are existing services protected during trenching?
Existing underground services, including other pipelines and cables, are located from plans and a service locator, potholed or exposed to confirm their position, and hand dug near rather than excavated with a machine. Existing pipelines along the route are exposed and protected before excavation proceeds, because striking a live pipeline or cable can cause an explosion or electrocution.
How is the pipe-string lift controlled during lowering-in?
Through a lift plan that coordinates the cranes or sidebooms lowering the long, flexible welded pipe string into the trench, with the load, rigging and ground conditions assessed and the machines working together. Workers are kept clear of and out from under the suspended string, because a dropped or swinging string can cause fatal crush injury, particularly to anyone in the trench.
What standard governs pipeline construction?
Pipelines carrying gas and liquid petroleum are constructed to the AS 2885 suite, with the laying of the pipe and the trench requirements governed by AS 2885.1. The excavation and lifting are controlled to the relevant Codes of Practice and crane standards, and the SWMS coordinates the excavation, plant, lifting and existing-services controls for the work.