Confined Spaces WHS Australia: Entry, Permits and Rescue

Confined-space work can expose a person to an unsafe atmosphere, engulfment, fire, explosion or difficulty escaping and rescuing someone. The first decision is whether the space and planned work fall within the applicable legal definition. The next is whether entry can be avoided. If entry is necessary, a risk assessment, controls, authorisation, communication and rescue arrangements must work together before anyone goes inside.

There is no single Australian confined-space law applied identically everywhere. Safe Work Australia publishes model WHS laws and a model Confined Spaces Code of Practice. A model provision or code has legal effect only when the relevant jurisdiction adopts or approves it. Victoria has its own Occupational Health and Safety Act and Regulations. This guide explains the model framework and flags Victorian differences; a real entry plan must be checked against the regulator for the site.

Is it legally a confined space?

A small room is not automatically a confined space, and a large vessel is not automatically safe. The model definition concerns an enclosed or partially enclosed space not designed or intended primarily for human occupation, at normal atmospheric pressure while a person is inside, with a risk such as harmful airborne contaminants, unsafe oxygen, fire or explosion, or engulfment. The exact statutory wording matters. A tank, pit, sewer or silo may meet it, depending on conditions. A plant room may be awkward to access yet fall outside the definition while still requiring other safety controls.

Document the reasoning for each space and task. Ask what it was designed for, how people enter and exit, what may be introduced during the job, and whether residues, connected pipes or adjacent processes can change the atmosphere. A decision made for inspection may not cover welding or cleaning in the same vessel. The Safe Work Australia model code provides guidance for identifying spaces and assessing the work.

Avoid entry where reasonably practicable

Can inspection be done externally, a blockage cleared remotely or equipment designed so maintenance happens outside? Avoiding entry can remove a serious exposure. If entry is required, plan it before the first person approaches the opening. The risk assessment should cover the space, the activity, residual material, energy sources, plant or services to isolate, atmospheric conditions, access, workers, other work nearby and the possibility of an emergency.

One generic form cannot answer every case. A clean water tank and a chemical process vessel may both be confined spaces but present different hazards. The model code says a generic assessment is appropriate only when the hazards, tasks and circumstances are the same; where they differ, individual assessment is needed. If a contractor finds an unrecorded line connected to the space, the existing assessment and permit should be reviewed before work continues.

Controls must exist before a permit is issued

The model WHS Regulations Part 4.3 addresses confined-space duties, including risk management, entry permits, signs, communication and emergency arrangements. Possible controls include isolating plant and services, preventing material inflow, cleaning or purging, ventilation, testing and monitoring the atmosphere, suitable equipment and a way to prevent unauthorised entry. The right controls depend on the specific hazard and local rule. A permit records authorisation and conditions; it cannot make a failed isolation or unsafe atmosphere acceptable.

The person who issues the permit should check the controls and limits for that actual entry. The person entering should understand the scope, communications, stop-work conditions and escape arrangement. Keep a means to account for entrants and know when they have exited. If conditions change, suspend the entry and reassess rather than treating the original signature as continuing authority.

Atmospheric testing is not a single reading

Oxygen deficiency or enrichment, toxic contaminants and flammable vapours may be invisible. Testing needs suitable equipment, competent use and an approach matched to the space, including locations where gases might accumulate. Work itself can change the atmosphere, so the assessment should decide whether ongoing monitoring is needed. A reading taken before ventilation or before a process restarts does not guarantee conditions later in the shift. Respiratory protection may be part of the controls but should not be used to excuse preventable contamination or an unplanned rescue.

The model code gives practical detail, while the local law and site conditions determine what must be done. This page deliberately does not publish a universal oxygen number or a blanket testing interval that readers might apply to every job.

Prepare for rescue before the entrant needs it

Confined-space emergencies can worsen when an unprepared colleague rushes in. Plan how entrants communicate with a person outside, how distress is detected, how the alarm is raised, and who can perform a rescue with the right training and equipment. Check that the opening is usable for rescue and that equipment is maintained. External emergency services may be part of the plan, but simply writing their number on the permit does not demonstrate that a timely rescue is feasible.

For Victorian work, WorkSafe Victoria's safety alert describes entry permits, a standby person outside, atmospheric testing and emergency procedures under its OHS framework. Its confined-space compliance code gives further detail. Do not copy Victorian regulation numbers or permit-retention rules into a national model-law summary. Check the actual state's or territory's regulator before using a form or assigning roles.

Example: inspecting an underground service chamber

A team plans to inspect a chamber after heavy rain. The opening is partly obstructed, a pump is connected and water may have brought contaminated material into the space. The supervisor should reassess whether entry is needed, check the chamber definition, isolate connected equipment, address flooding and atmospheric hazards, test as required and confirm communication and rescue. A permit prepared for a dry-day inspection is not enough if the conditions have changed. The team should not enter to “see whether it is safe” before completing the controls.

Evaluate Complys Australian WHS software for a wider organisational workflow. The relevant WHS regulator and competent site personnel remain essential for the actual entry decision.