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• non-routine operations jobs where two or more individuals or groups need to co-ordinate
activities to complete the job safely; jobs where there is a transfer of work and responsibilities
from one group to another.

More specifically, the following are examples of types of job where additional permits or
certificates (e.g. isolation certificates) should be considered:

• work of any type where heat is used or generated (eg by welding, flame cutting, grinding etc);
work which may generate sparks or other sources of ignition.
• work which may involve breaking containment of a flammable, toxic or other dangerous
substance and/or pressure system; work on high voltage electrical equipment or other work
on electrical equipment.
• which may give rise to danger, entry and work within tanks and other confined spaces.
• work involving the use of hazardous/dangerous substances, including
• radioactive materials and explosives; well intervention.
• diving, including onshore operations near water.
• pressure testing.
• work affecting evacuation, escape or rescue systems.
• work involving temporary equipment, e.g. generators, welding equipment etc.
• work at height.
• any operation which requires additional precautions or personal protective
• equipment (PPE) to be in place; any other potentially high-risk operation.

Operation and Application

Permit to Work consists of following four stages:

• Issue
• Receipt
• Clearance/Return to service
• Cancellation
• Extension

Permits are used with unique identification number for reference purposes and are usually made
as triplicate copy. The Permit to work operate in the following way.

Issue

This section identifies the nature of hazards present and determines the suitable precautions that
are required.

POSHE V2| Unit IG1 – Element 3 – Managing Risks – Understanding People and Processes 53