The project started after a conversation with Safety were Maintenance asked why PTW are not required for routine operations conducted at Production areas. Safety expalined that:
* HAZOPs studies were conducted for those operations,
* risks and hazards were identified and analyzed,
* measures to control, minimize and/or eliminate the risks were applied, and
* written operational procedures were developed with the SHE precautions and instructions for safe operation.
Operators are trained on the procedures and supervision is there to ensure compliance to them, therefore the intention of the PTW is already met with the procedures.
Then Maintenance said:
* We have repetitive tasks (PM) like the routine operations of Production.
* We have written instructions (PM Orders) for those tasks.
* Our technicians are trained and under supervision.
If the conditions are equivalent, can PM orders be exempted from PTW?
Safety then agreed to evaluate with us the PM tasks lists, in a HAZOP like manner, besides some of the PM tasks were initially inserted due to recommendations of the equipment operation HAZOP study.
* From start, any PM that is limited to visual inspection, gauge readings documentation, no equipment disassembly, was exempt of PTW, provided that an instruction for the PPE required for access the equipment location was included.
* any job to be executed with outside contractors, require PTW.
* If conditions of the jobs are the not the same each time that the task list is executed, then PTW is required. For example, if the same task list is used for 10 fans, but some are wall mounted at 20 ft high, others can be serviced standing on the floor.