Permit to Work Major Hazard Standard - MIRMgate

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WMC EHS Management System Major Hazard Standard Permit to Work All isolations are performed by an Isolator and checked by an Isolation Checker. This is a recorded isolation performed under the Permit to Work System. A written record is required on an ‘Isolation Certificate‘ and forms part of the documentation attached to the covering Work Permit. Note: When High Voltage or radiation sources are involved there is a need for specialist help and a need to demonstrate compliance with a legislated requirement then a High Voltage (HV) Permit according to requirements of SP 25 or Radiation Certificate will be required in addition to the Isolation Certificate. 2. Isolation Documents 2.1 Isolation Certificate An Isolation Certificate is a checklist and permanent record showing nominated isolation points and the precautions that have been taken to address special hazards associated with performing Level 2 Isolation (see Appendix D2). These can be manually generated or produced in electronic document controlled form (using the same Isolation Certificate format) for frequently executed isolations. For work on High Voltage equipment an additional SP 25 Permit(s) is required and a Radiation Certificate for work on or near radiation sources (See Appendix G3). These serve as checklists and permanent records indicating safe work precautions have been taken to address special hazards as per legislated requirements. When HV or radiation isolations are conducted the specific points are also recorded on the Isolation Certificate/Instruction. 2.2 Isolation Instruction An additional ‘Isolation Instruction’ can be used for a complex isolation or an isolation that has to be done in a sequential order to bring the equipment to a state of zero energy for work to commence. It is attached to the Isolation Certificate that records the Instruction reference number. The Instruction shall include: • The limits and extent of the isolation • Any special conditions to be met (beyond those already specified in Work Permit) • Specialist isolations required (eg. HV or Radiation) • Isolation point information in the same format as the Isolation Certificate This Instruction shall be produced following a risk assessment, authorised by a senior line person and controlled within the sites document control system. It shall not be altered without proper authorisation by a senior line person. A procedure for authorising alteration shall be developed by the site. 3. Performing an Isolation Following advice from a Permit Issuer that as part of implementing agreed Work Permit hazard controls, isolation of energies is required: • An Isolator shall confirm that the Permit Issuer prepared Isolation Certificate (and Isolation Instruction if attached) is appropriate for the defined scope of work (in the situation in which the Permit Issuer performs the role of an Isolation Checker) • An Isolator shall carry out isolation of energies they are authorised to perform. Positive isolation of each isolation point must be proved • An Isolator shall padlock each isolation point with a uniquely keyed isolation lock(s) and isolation tag cross referenced to the Work Permit number • An Isolator shall sign the Isolation Certificate indicating that isolations have been achieved and proved. Isolators who isolate multiple isolation points on one Certificate may sign once only to acknowledge their work WMC-EHS-MHS-007 DocsOpen Ref : 155520 Issued: 23/12/03 Page 22 of 59
WMC EHS Management System Major Hazard Standard Permit to Work • A Permit Issuer shall arrange for an Isolation Checker to check completed isolations and sign on the Isolation Certificate (checking for correct isolation point as per Certificate/Instruction and that tag / lock are in place). If the Permit Issuer also performed the isolations as Isolator, then the Isolation Checker shall additionally confirm that the Isolation Certificate/Instruction as defined by the Permit Issuer is appropriate for the scope of work. Because the competency of the Checker is equal to the Isolator it is anticipated that the Checker will check isolation integrity as a part of the process The Isolation Checker shall be a different person from the person who performed the isolations (this person can be the Permit Issuer if they did not perform the isolations). An Isolator shall return the completed Isolation Certificate to the Permit Issuer and place the isolation lock key(s) in the Permit Control Board (see Section 7). A Permit Issuer shall ensure that all isolation key(s) are locked in place with an isolation tag (with the Work Permit number recorded) and uniquely keyed Permit Issuers lock. When a Testing Program (see Section 9) forms part of the defined scope of work, the following shall occur: • The Isolator performs isolations following the standard method, but uses a different uniquely keyed lock(s) for the nominated testing points. • The Permit Issuer places all non-testing point isolation key(s) in a separate lock box, apply an isolation tag and lock in place with a Permit Issuer lock. This lock box is placed inside the Permit Control Board. The remaining ‘testing point’ isolation key(s) are placed in the Permit Control Board. 4. Performing a Block Isolation When a number of different tasks are being completed under separate Work Permits with all tasks sharing the same Isolation Certificate the isolation is called a Block Isolation. If the need for a Block Isolation has been established by the scope of work/hazard control analysis conducted by the Service Provider, the Permit Issuer initiates the standard isolation process. The Permit Issuer shall draw up a Work Permit Register and the number of this document is recorded on the Isolation Tag for use during isolations. Note: The Permit Control Board resulting from this isolation should be placed centrally as close to the common worksite as possible. When a large number of personnel are involved in work associated with a Block Isolation, additional Permit Control Boards may be used and placed closer to the specific worksite. In this situation the following shall occur: • The Permit Issuer shall attach an additional Isolation Tag annotated with the specific Work Permit number and secured in place by a uniquely keyed Isolation lock to the central Permit Control board • The key for this lock is placed in an additional Permit Control Board that is taken to the specific work site • Following a Permit Acceptor briefing, each work team member shall attach their Personal Danger Tag and lock to the worksite located Permit Control Board prior to commencing work. 5. Cancelling an Isolation When work is complete and the Permit Issuer initiates the requirement to remove the isolation, the following shall occur: • The Permit Issuer removes the Permit Issuer lock and Isolation Tag and provides the isolation key(s) to the Isolator WMC-EHS-MHS-007 DocsOpen Ref : 155520 Issued: 23/12/03 Page 23 of 59
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Permit to Work Major Hazard Standard - MIRMgate

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