Permit to Work Major Hazard Standard - MIRMgate

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WMC EHS Management System Major Hazard Standard Permit to Work • The Isolator commences removal of the isolations lock/tag(s) • When all isolation locks/tags have been removed, the Isolator shall return the Isolation Certificate together with all locks/tags to the Permit Issuer • The Permit Issuer shall confirm the number of locks/tags matches the Isolation Certificate requirements 6. Tags Isolation procedures shall use the following four tags: • Isolation Tag • Personal Danger Tag • Testing Tag • Out of Service Tag 6.1 Isolation Tag This is an instruction tag that indicates the equipment is in a state that prevents the flow of energy. The tag shall refer the reader to the person(s) or position(s) who are authorised to change the status of the equipment. The tag shall be locked in place at an isolation point with an isolation lock. When used to secure the isolation key(s) in the Permit Control Board, it is locked in place with a Permit Issuers lock. 6.2 Personal Danger Tag (PDT) This is an instruction tag indicating that there shall be no change in equipment status while this tag is in place. The tag shall be locked in place with a uniquely keyed lock All persons working on isolated equipment shall affix their PDT to the Permit Control Board before commencing work. Whilst any PDT remains in place removal of isolations shall not take place. Any person may place their PDT on any or all isolation point(s) affecting their safety. A PDT shall be removed by the owner before they leave the work site e.g. at shift end. Only the tag owner shall remove their PDT. If this is not possible, the site shall have a procedure in place for the removal of a PDT without risk to personnel. .This procedure shall be authorised by the General Manager (or equivalent). 6.3 Testing Tag This is an instruction tag indicating to the reader that the isolations associated with the tag have been temporarily removed to allow testing to be carried out. The tag shall be tied onto the Permit Control Board and onto isolation points whilst testing. 6.4 Out of Service Tag This is an informational tag, indicating to the reader the equipment item shall not be used until cleared for safe operation by a competent person. When Out of Service tags are used, they must be secured in place. 7. Permit Control Board A Permit Control Board has the dual function of housing the Work Permit documentation and securing the isolation key(s) in a lock box. WMC-EHS-MHS-007 DocsOpen Ref : 155520 Issued: 23/12/03 Page 24 of 59
WMC EHS Management System Major Hazard Standard Permit to Work • Following isolations, all isolation keys common to locks used at specific isolation points shall be placed in the lock box section of the Permit Control Board • The lock box shall be locked with an Isolation Tag and a Permit Issuer’s lock prior to work team members attaching their Personal Danger Tags • The key to the Permit Issuer’s lock shall remain in a Permit Issuers key cabinet under control of Permit Issuers at all times • The Permit Issuer shall not remove the Isolation Tag and Permit Issuer Lock from the Permit Control Board until the Work Permit has been handed back and signed off by the Permit Acceptor • Removal of isolations shall not commence before all Personal Danger Tags have been removed from the Permit Control Board 8. Achieving and Securing Positive Isolation All equipment requiring isolation and all isolation points shall be uniquely and clearly identified Isolation shall always be applied to the energy source and not rely on control circuitry. Push buttons, stop switches, interlocks, emergency stops, pilot circuitry lanyards, etc. shall not be used as a means of isolation To achieve positive isolation the following steps shall be followed: • Isolate and prove (By Isolator) • Tag and lock (By Isolator) • Test (By Permit Acceptor/Work team member) Effective mechanical and process isolations shall be achieved to a particular standard for all intrusive work. Energies associated with mechanical, kinetic, pressure and chemical processes shall be isolated to an acceptable standard. The method used shall be based upon risk assessment with the objective being to ensure that the risk of release of energies is reduced to as low as is reasonably practicable (ALARP). All parts of isolation shall be proved during installation to confirm that they do prevent the flow of energy. During the period that the isolation is in place it may be necessary to confirm that the integrity has not been compromised, by monitoring bleeds or vents for isolation breach. Isolation methods range from physical disconnection and insertion of blanks/spades to double block valve and bleed through to single block valve. Each method has advantages/disadvantages and the risk assessment shall be used to determine the most effective method. Proof of electrical isolation requires evidence of a physical break in the electrical supply. If the use of a de-contactor, visible break contactor or phase lights is not possible, electrician continuity testing is required to establish proof of isolation. All isolations shall be secured by use of a locking device and these locking devices shall require the use of a key or special tool to achieve removal. Isolation locks are uniquely keyed or keyed alike in sets. Personal Danger locks shall be uniquely keyed. Permit Issuers locks shall be uniquely keyed (Note: these locks and keys are best secured in a Permit Issuers cabinet with Permit Issuers retaining a common key to cabinet). Coloured padlock systems shall not be used under this procedure. A system of locking device and key management shall be defined by the site. WMC-EHS-MHS-007 DocsOpen Ref : 155520 Issued: 23/12/03 Page 25 of 59
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Permit to Work Major Hazard Standard - MIRMgate

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