QEHSOperations
Permit to Work System
A formal, documented system authorising hazardous work for a defined scope and duration.
A PTW system ensures that all hazards are identified and controlled before work starts, and that multiple work activities are coordinated safely. Types: hot work, confined space entry, working at heights, electrical isolation, excavation, radiography. The permit is issued by an authorised person, accepted by the work team, and formally closed on completion. PTW failures are implicated in many major industrial disasters.