Permit to Work Systems Flashcards

A hot work permit should specify a fire watch period after the work is completed. Why?

Answer: Smouldering fires can develop from sparks or embers that appear to have been extinguished — a fire watch (typically 60 minutes minimum) detects these before they develop into a significant fire

Sparks from hot work can smoulder in concealed materials (insulation, cavities, timber) for up to several hours before igniting. A fire watch of at least 60 minutes after the hot work is completed, with appropriate fire-fighting equipment, is essential to catch delayed ignitions.

What is an 'isolation certificate' and when is it used with a permit to work?

Answer: A document confirming that energy sources (electrical, hydraulic, pneumatic, thermal) have been safely isolated and locked off before work begins — used with PTWs for work on plant, equipment, or services

An isolation certificate (or lockout/tagout record) confirms that all relevant energy sources have been safely isolated, locked, and tagged before the work begins. It is often issued alongside a PTW for maintenance or electrical work to prevent accidental re-energisation.

A permit to work for entry into a confined space must include:

Answer: Atmospheric testing results, rescue and emergency arrangements, equipment required, duration of the permit, and the trained standby person's details

A confined space entry PTW must specify: atmospheric test results (oxygen, toxic gases, flammable gases), entry and exit routes, emergency and rescue arrangements (including a trained standby person), duration, equipment required (including communications), and any specific precautions.

Who may authorise a permit to work on a construction site?

Answer: A competent, specifically authorised person with the knowledge and authority to assess that the required precautions are in place and to grant permission for the work

Only specifically authorised, competent persons may issue PTWs. They must have the knowledge to assess the hazards and verify that all required precautions are in place. The authorising role must be formally assigned and the person specifically trained for it.

A worker starts hot work without obtaining the required permit. The site manager should:

Answer: Stop the work immediately and not allow it to resume until the proper permit process has been followed

Unauthorised hot work creates an immediate fire risk. The site manager must stop the work immediately. The area must be checked for any fire that may already have started, the proper PTW process must be followed, and the worker must be disciplined as appropriate.

How long should a permit to work be retained after its close-out?

Answer: In accordance with the site's safety management system — typically at least 3 years, as they form part of the health and safety records

Permits to work are health and safety records and should be retained in accordance with the site's document retention policy. As health and safety records they are typically kept for at least 3 years, and longer for projects involving asbestos or other significant hazards.