The PTW is the overriding document and supersedes the Risk Prediction. In some situations, it may be appropriate to attach the PTW and the Risk Prediction together; in others, this may be unnecessary or not appropriate.
Multiple copies of the signed PTW are required: one should be displayed at the work site1, and another in the relevant control room, so that operating and maintenance personnel can easily see what high-hazard work is in progress2. IT systems may be used to create and manage PTW forms. However, they should enable electronic signatures (including from visiting contractors) and a copy of the PTW should be printed out for display at the work site.
Sometimes a single job may require more than one PTW. This will depend on the hazards involved and the design of the local PTW forms3. If different Permit Issuers are involved, they may need to consult each other during issue and closure.
Notes:
1. If not practical (eg if work is carried out in multiple locations) the Performing Authority may keep the PTW.
2. If Permit Issuers do not have easy access to control rooms, they may require an additional personal copy.
3. For example, if a site has separate PTW forms for hot work and work at height, then a welding job carried out from a mobile scaffold would require two PTWs to be issued.