Permit to Work Major Hazard Standard - MIRMgate

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WMC EHS Management System Major Hazard Standard Permit to Work • The completion of the work and cancellation of the Work Permit and Certificate by the authorised person. The Confined Space Entry Certificate shall be prominently displayed in the Permit Control Board at the entry point to a confined space. Should any site alarms, outside of normal site testing requirements, require evacuation of the space then the confined space shall be re-gas tested prior to re-entry. When work is completed the Work Permit shall be cancelled by the Permit Issuer only after that person has: • Ensured that all persons who entered the space have signed off the Entry/Exit Log and removed their Personal Danger Tag from the Permit Control Board • Visually checked the confined space to ensure that all personnel are clear and that all equipment & tools have been removed from the confined space • Checked that the work area is clear and that the equipment can safely be returned to service. 6.2 Atmosphere Before a person enters a confined space, it shall be ensured where it is technically feasible to do so, that: • The confined space contains an oxygen level within the safe oxygen range • The atmospheric contaminants in the confined space are reduced to below the relevant exposure standards • The concentration of flammable contaminant in the atmosphere of the confined space is below 5% of its LEL. Each site shall have systems to ensure that: • Risk assessments identify appropriate control measures where any activity in or on a confined space may introduce atmospheric contaminants (toxic or flammable) or affect the level of oxygen inside the space • Atmospheric testing, re-testing & monitoring of confined spaces on each site is conducted consistent with the inherent nature of the space and the hazards identified in the risk assessment for the work to be performed • Atmospheric testing is only performed by trained and competent persons authorised to do so. A register of authorised Gas Testers shall be kept and maintained on each site • Atmospheric testing is performed from outside the space if practicable and technically feasible. If it is necessary to enter the space to test the atmosphere, a risk assessment that stipulates the safe testing procedure and a Work Permit and a Confined Space Entry Certificate is required prior to entry • Where persons have entered a confined space and the level of flammable contaminant in the atmosphere of the confined space has been found to be greater than 5% but less than 10% of its LEL, all persons are to be removed from the space unless continuous monitoring is used in accordance with AS 2865 • Where the concentration of flammable contaminant in the atmosphere of the confined space is greater than 10% of its LEL, no person shall enter or remain in the confined space • Where there is a presence of flammable contaminants, there shall be a system implemented to control all potential ignition sources including static electricity WMC-EHS-MHS-007 DocsOpen Ref : 155520 Issued: 23/12/03 Page 32 of 59
WMC EHS Management System Major Hazard Standard Permit to Work • Where it is not technically feasible to ensure an oxygen level in the atmosphere greater than 19.5% (and less than 23.5%), or the atmospheric contaminants cannot be reduced to below the relevant exposure standards, no person shall enter the confined space unless they are equipped with suitable personal protective equipment including appropriate air supplied respiratory protective equipment. 6.3 Cleaning and Purging There shall be a system to ensure that identified confined spaces are cleaned and purged, consistent with the risk assessment. Purging and cleaning should be performed from outside the space if reasonably practicable. If it is necessary to enter the space to purge or clean the space, a Work Permit and a Confined Space Entry Certificate in accordance with this standard is required prior to entry. 6.4 Hot Work Any hot work that must be performed within or on a confined space shall be in compliance with the requirements of Appendix F1 of the Permit to Work Standard. A detailed risk assessment for any hot work performed within or on confined spaces shall consider the potential to affect the safety of the atmosphere. Good working practices include: • Identifying the flammability and thermal decomposition products of coatings, scale, sludge and metals (alloys) generated from hot work • Switching off the power source to equipment when arc welding is suspended for crew breaks or at end of shift. All electrodes shall be removed from holders and placed so that accidental arcing or contact cannot occur • Closing torch and cylinder valves, de-pressure and remove the whole torch and assembly hose when oxy acetylene cutting, heating or welding is suspended for breaks or shift change • Not taking compressed gas cylinders or associated manifolds, other than those used for breathing apparatus, inside the confined space. 6.5 Ventilation Ventilation of confined spaces can include natural, forced air or mechanical means to establish and maintain a safe atmosphere. Mechanical ventilation equipment shall be regularly inspected and maintained in proper working condition by competent persons. Mechanical ventilation equipment used during confined space occupancy shall be continuously monitored while the confined space is occupied and the controls will be clearly tagged to ensure they are not interfered with by unauthorised persons. The risk assessment and procedures shall take into account the hazards of introducing atmospheric contaminants from unsafe sources including the location of combustion engines, their exhaust and the ability for any atmospheric contaminants to enter or re-enter a confined space (eg change of wind direction). 6.6 Stand-by Person A Stand-by Person, shall be designated and remain outside the confined space where determined by risk assessment. All stand-by Persons shall be trained, assessed and passed as competent to: • Initiate site emergency procedures if required WMC-EHS-MHS-007 DocsOpen Ref : 155520 Issued: 23/12/03 Page 33 of 59
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Permit to Work Major Hazard Standard - MIRMgate

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