DOCUMENT CONTROL Document Owner (May also be the Process Owner) Approved By * Authorisation ** Process Owner is hereby vested with authority and responsibility to manage the process end to end. Name: Mark Van Vuuren Position: Field Practices Coordinator Date: June 2014 Name: Mark Van Vuuren Position: Field Practices Coordinator Date: June 2014 Name: Lance Roberts Position: Manager Health and Safety Date: June 2014 Date Created/Last Updated June 2018 Review Frequency *** Every 3 years Next Review Date *** June 2021 * Must be the Process Owner and is the person assigned authority and responsibility for managing the whole process, end-to-end, which may extend across more than one division and/or functions, in order to deliver agreed business results. ** This person will have the power to grant the process owner the authority and responsibility to manage the process from end to end. *** Frequency period is dependent upon circumstances maximum is 5 years from last issue, review, or revision whichever is the latest. If left blank, the default will be 1 year unless otherwise specified. STAKEHOLDERS The following positions must be consulted if an update or review is required: NOTIFICATION LIST The following positions must be notified of any authorised change: MANAGER SAFETY AND HEALTH MANAGER MICROGRIDS GENERATION ASSET MANAGER MICROGRIDS GENERATION FIELDS PRACTICES COORDINATOR MANAGER SAFETY AND HEALTH MANAGER ENGINEERING & PROJECTS SERVICES ASSET MANAGER MICROGRIDS GENERATION MANAGER MICROGRIDS GENERATION FIELDS PRACTICES COORDINATOR REGIONAL MANAGEMENT TEAM (RM, AM, WDC) OPERATIONAL STAFF
HORIZON POWER INTRODUCTION This Generation Permit-to-Work Standard (GPTWS) provides the minimum safety standards for activities related to inspection, testing, commissioning, operation, maintenance and modification of generation assets. These Standards are written to assist Horizon Power employees, contractors and other parties involved in managing risks associated with carrying out the diverse breadth and depth of these activities in the business. The standards govern generation asset isolation but do not detail all of the necessary requirements to carry out activities, but together with other procedures, operational instructions and manuals will provide a structured safe system of work. The GPTWS have been written to support Horizon Power s overall Safety and Health Management System and the hierarchy of Acts/Regulations, Codes of Practice, Organisational Policies, Practices and Procedures. Hierarchy of Documentation WA general workplace safety legislation administered by the regulator WorkSafe WA: Occupational Safety and Health Act 1984 Occupational Safety and Health Regulations 1996 WA Electrical legislation administered by the regulator EnergySafety WA: Electricity Act 1945 Electricity Licencing Regulations 1991 Electricity Regulations 1947 In the interest of your own personal safety, and the safety of all Horizon Power workers and the general public it is essential that you read these standards and understand how they relate to your work environment. These Standards will be regularly reviewed, if there are any queries and suggestions for improvement, then direct your queries to the Field Practices team via the Continuous Improvement Process. The following diagram (the next page) outlines the framework into which these Standards fit.
HORIZON POWER Figure 1 Legislative/ Horizon Power framework DM# xxxxxxxx Reviewed Date: June 2018
HORIZON POWER CONTENTS 1 PURPOSE...1-1 2 SCOPE...2-1 2.1 General...2-1 2.2 Isolation and Issuing Permits...2-1 2.3 Training and Authorisation...2-1 3 DEFINITIONS...3-1 4 RESPONSIBILITIES...4-1 4.1 Formal Leaders...4-1 4.2 Authorised Persons...4-1 4.3 Permit Issuer...4-1 4.4 Isolation Officer Mechanical/Electrical...4-2 4.5 Recipient-in-Charge...4-2 4.6 Recipient...4-3 5 SAFETY PRINCIPLES...5-1 5.1 General...5-1 5.2 First Aid...5-1 5.3 Personal Protective Clothing and Equipment...5-1 6 ENERGY ISOLATION...6-1 6.1 General...6-1 6.2 Identifying Isolation Points...6-3 6.3 Isolation Procedure...6-4 6.4 Locking Isolations...6-4 6.5 Remove Isolation...6-6 6.6 Removal of Locks...6-6 6.7 Isolation Tags...6-7 7 PERMIT TO WORK...7-1 7.1 General...7-1 7.2 Preparation of a Permit-to-Work...7-2 7.3 Isolation...7-2 7.4 Issuing a Permit to Work...7-3 7.5 Storage of a Permit to Work...7-3 7.6 Working Under a Permit to Work...7-3 7.7 Relinquishing a PTW for a STT...7-4 7.8 Cross Boundary Permit and Lockout Requirements...7-5 7.9 Transferring Responsibility of a Permit to Work...7-6 7.10 Relinquishing a Permit to Work...7-6 7.11 Cancelling a Permit to Work...7-7 8 SUPPLEMENTARY PERMITS...8-1 8.1 General...8-1 8.2 Hot Work Permit...8-1 8.3 Confined-Space Entry Permit...8-1
HORIZON POWER 8.4 High Voltage (HV) Electrical Access Permit...8-2 8.5 Excavation and Trenching Permit...8-2 8.6 Sanction-to-Test (STT) Permit...8-2 8.7 Operating Agreement...8-3 9 REMOTE SITE PERMIT TO WORK REQUIREMENTS...9-1 9.1 General...9-1 9.2 Preparation of Permit to Work...9-1 9.3 Equipment Preparation Isolate...9-2 9.4 Issuing a Remote Site Permit to Work...9-2 9.5 Working Under a Remote Site Permit to Work...9-2 9.6 Cancelling a Permit to Work...9-2 10 APPENDIX SECTION...10-1 10.1 Appendix A Isolation Philosophy...10-1 10.2 Appendix B - Permit to Work Flow Diagram...10-1 10.3 Appendix C Associated GPTWS links...10-1 DM# xxxxxxxx Reviewed Date: June 2018
HORIZON POWER SECTION 1 Page 1-1 1 PURPOSE This standard encompasses instructions necessary for safe access to Generation Assets within Horizon Power s generating systems and fuel facilities to ensure safety of generation assets and personnel from the dangers related to hazards or unauthorised operation. The instructions explained in this Standard are the minimum required to ensure the safety of personnel and plant. This Standard has been prepared to address all of Horizon Power s generation assets and has specific inclusions to cater for remote locations where a single person is likely to be working alone. The Standard has been developed to cover the following key processes: Permit to Work Supplementary Permits Isolation(s) Remote Site Authorisation Where Horizon Power have sites located within the boundaries of other organisations or where it operates through established Alliance or Joint Venture arrangements the requirements of this standard shall be applied as the minimum standard. DM# xxxxxxxx Reviewed Date: June 2018
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HORIZON POWER SECTION 2 Page 2-1 2 SCOPE 2.1 General These standards shall apply to all persons who work on or near Horizon Power s generation assets. This standard applies where inspection, testing, commissioning, operation, maintenance and modification activities are carried out on generation assets. This Standard applies to: generation assets owned and/or controlled by Horizon Power, or generation assets owned or controlled by contractors or others where the plant is located on premises owned by Horizon Power. the boundary of the Power Station shall be the output bushings of the step up transformer or the supply side of a feeder circuit breaker if there is no step up transformer. This standard does not apply to: where there is no risk to the safety of person(s) and or generation asset integrity. a construction site that has no potential to be connected to any operational generation asset(s). 2.2 Isolation and Issuing Permits The isolation of generation assets and the issue of permits is a restricted duty. Only Horizon Power authorised persons are allowed to make equipment isolations and issue permits. 2.3 Training and Authorisation Persons who are required to work on Horizon Power s generation assets shall not do so unless they: have been appropriately trained for the work they intend to do; have the appropriate authorisation to perform the work. To maintain authorisation, refresher training in the GPTWS shall be undertaken at regular intervals (every 2 years). The minimum knowledge and skills necessary to perform specified activities and tasks will be assessed. Refresher training may be carried out on the work site. Field Practices Safety Interaction Audits will be carried out in a scheduled manner to audit against generation related instructions. DM# xxxxxxxx Reviewed Date: June 2018
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HORIZON POWER SECTION 3 Page 3-1 3 DEFINITIONS Terminology Approved Authorised Person Circuit Breaker Control Lock (Blue) Definition Having the appropriate organisation endorsement in writing for a specific function. A person with technical knowledge or sufficient experience who has been approved, or has the delegated authority to act on behalf of Horizon Power to perform the task concerned Circuit Breaker shall mean an item of electrical apparatus designed to de-energize an electrical system under conditions of load and/or fault. An individually keyed Blue Lock that is attached by an Authorised Person to further secure a Lockbox and provide protection for the generation asset and personnel. Danger Tag A tag applied in conjunction with a Personal Lock to identify an individual who is working under the conditions of a Permit-to-Work. Only the person whose name appears on the Danger tag can remove the tag. Earthed Energy Isolation Formal Leader Earthed shall mean electrical apparatus, which has been electrically connected to earth effectively, ensuring an immediate and continuous discharge of electrical energy. The point at which an energy source (electrical only) is disconnected or physical blocked and secured from uncontrolled movement to ensure safety of personnel and the generation asset. An individual appointed by Horizon Power who is accountable for implementing the safety activities necessary to achieve safety for persons, environment and the generation asset, within and across defined boundaries.
SECTION 3 Page 3-2 HORIZON POWER Terminology Generation Asset Definition For the purpose of this standard means any plant or equipment used in the production and or generation of electricity i.e. electrical, electronic, SCADA, control, mechanical, liquid, gas, instrumentation, and communication, etc. High Voltage (HV) Where voltage exceeds 1000 volts alternating or 1500 volts direct current. Hot Work HV Switching Officer HV Switching Operation HV Isolation Lock (Black) Means using welding, flame cutting or other fire or sparkproducing power tools. A person authorised to carry out HV switching operations within their limits of authority on generation assets. Any physical operation required to energise, de-energise, or earth HV apparatus or any other device used in accordance with an authorised Switching Programme. An individually keyed Black that is attached by a HV Switching Officer to secure a Lock-out on HV equipment. Isolation Lock (Yellow) An individually keyed Yellow lock that is attached by an Isolating Officer to secure a Lock-out (other than HV isolation) e.g. Mechanical isolation or Low Voltage (LV) electrical isolation. Isolation Officer Isolation Tag A person authorised to isolate generation assets (other than HV unless authorised) to be worked on under a Permit-to-Work. A tag installed by the Isolating Officer/HV Switching Officer that contains Permit to Work information.
HORIZON POWER SECTION 3 Page 3-3 Terminology Job Risk Assessment (JRA) (DM# 3104177) Lockbox Definition Before any work starts, a JRA is carried out to identify any hazards and ensure their associated risks are either eliminated or suitably controlled in accordance with Horizon Powers minimum standards. A safety device used to contain the keys of Isolation Locks associated with a Permit-to-Work. Lockboxes shall have the means of being able to be secured by Control (Blue), Isolation (Yellow) and Personal Locks (Red). Lock-out Lockout Hasp A device placed as a means of physically securing and identifying isolation and/or control measure placed for safety. A Lock-out generally consists of a keyed lock and Isolation Tag or Danger Tag. To be used in conjunction with an Isolation Lock to allow the fitting of multiple locks. Mechanical Isolation Operating Agreement (OA) The point at which an energy source (Gas, Fuel, etc) is disconnected or physical blocked and secured from uncontrolled movement to ensure safety of personnel and the generation asset. An OA is a statement outlining the condition of generation asset(s) that shall be used between operating authorities across operational boundaries to confirm asset conditions and isolations to support an access authority or other operational requirements. This statement covers only the state of the generation asset(s) specified and does not by itself authorise work on the electrical apparatus or plant. Operational Area Operational Work Any generation store warehouse, compound, power station, workshop, switchyard, switch room or enclosure. Any construction, testing and commissioning, inspection, maintenance (e.g. cleaning), fault finding, operating activity or decommissioning on or near generation assets including HV Switching.
SECTION 3 Page 3-4 HORIZON POWER Terminology Permit Board Permit Issuer Permit Requestor Permit-to-Work (PTW) Permit-to-Work Register Personal Lock (Red) Definition A board where the Permit-to-Work and any Supplementary Permits are prominently displayed whilst permits are open. An Authorised Person appointed to prepare, issue, transfer and close a Permit-to-Work, Supplementary Permits or other authority to work and all associated documentation Any person wishing to schedule or perform work that requires a Permit-to-Work to be issued prior to the commencement of the work. A formal written authorisation which allows access to, work on or near, or testing of generation assets. It details the isolation(s) and control(s) implemented to make the generation asset safe. A register that contains a sequence of PTW numbers for all issued, cancelled and future permits. An individually keyed Red Lock that is attached as an additional Lock-out by the Recipient-in-Charge and Recipient(s) to further secure Lockouts made in the preparation of the Permit-to-Work. Remote Site Remote Site Authorisation Recipient Recipient-in-Charge Safety Document Horizon Power sites that are operated and maintained by single person. The issuing of a Permit-to-Work by the Permit Issuer to an Authorised Person completing work in a Remote Site location. A person or group of persons performing work under a Permit-to-Work. An Authorised Person who accepts the conditions of a Permit-to-Work and is responsible for the work being carried out by a Recipient under the Permit-to-Work. Any safety related document such as Permit-to-Work, JRA, Safety Case, Safety Management Plan, Procedure, Work Instruction, etc.
HORIZON POWER SECTION 3 Page 3-5 Terminology Single Point Isolation Definition An activity that is performed where a single isolation protects or supplies generation asset. Standard Isolation Supplementary Permits Generation site specific pre-defined isolation procedure for generation assets. Additional permits used to support a Permit-to-Work. They are used for activities such as Confined Space Entry, Excavation, Hot work, HV Access, Sanction-to-Test and other high risk activities.
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HORIZON POWER SECTION 4 Page 4-1 4 RESPONSIBILITIES The following responsibilities are set for Horizon Power and Contractors working on Horizon Power Assets. Horizon Power personnel and contractors have a requirement to ensure they are trained, have read, understood and comprehend the Horizon Power GPTWS requirements at the time of their induction. Once training is completed it is the responsibilities of all personnel to be appropriately authorised (see section 2.3). 4.1 Formal Leaders It is the responsibility of the Formal Leader to ensure: that the GPTWS are applied without compromise to ensure the safety of all personnel working on Horizon Power s generation assets. the instructions and procedures contained in this standard are read, understood and complied with. employees are trained and authorised to perform the assigned tasks. they correct the behaviour of employees who fail to follow the instructions and procedures contained in this standard. 4.2 Authorised Persons It is the responsibility of the Authorised Person to: comply with the instructions and procedures contained in this standard. practice safe behaviour. perform Job Risk Assessment(s) (JRA) for each new task or as jobs change. actively work with the Formal Leader to support implementation of safety programmes. Authorised Persons will ensure the GPTWS and all related procedures are applied without compromise to ensure the safety of personnel from hazards. 4.3 Permit Issuer It is the responsibility of the Permit Issuer to: comply with the instructions and procedures contained in this standard. define the isolation and/or control measure(s) of the Permit-to-Work (PTW) in accordance with the instructions and procedures contained in this standard. ensure that Recipient-in-Charge acknowledges the PTW conditions and the isolation and control measure(s) before the issuing the PTW.
SECTION 4 Page 4-2 HORIZON POWER correct the behaviour of a Recipient-in-Charge who fails to comply with the conditions contained within the PTW. 4.4 Isolation Officer Mechanical/Electrical It is the responsibility of the Isolation Officer to: undertake isolations of generation assets (only if authorised) in accordance with the instructions and procedures contained in this standard. perform JRA(s) for each new task or as jobs change. 4.4.1 Mechanical and Low Voltage (LV) Switching Officer It is the responsibility of the Mechanical/LV Switching Officer to: only undertake mechanical isolations within their limits of authority on generation assets only undertake LV switching operation within their limits of authority on generation assets 4.4.2 High Voltage (HV) Switching Officer It is the responsibility of the HV Switching Officer to: undertake HV switching operations within their limits of authority on generation assets. 4.5 Recipient-in-Charge It is the responsibility of the Recipient-in-Charge to: accept responsibility as the person in charge of the work. comply with the instructions and procedures contained in this standard. agree to the conditions of the PTW. ensure the Recipient(s) complies with the conditions contained within the PTW. ensure that all Recipient(s) sign on and off the Permit-to-Work as required. correct the behaviour of a Recipient who fails to comply with the conditions contained within the PTW. ensure a Job Risk Assessment is completed with each permit or as jobs change. ensure that when transferring a PTW the incoming Recipient-in-Charge acknowledges the PTW conditions and the isolation and control measure(s) of the PTW.
HORIZON POWER SECTION 4 Page 4-3 4.6 Recipient It is the responsibility of the Recipient to make sure that they: comply with the instructions and procedures contained in this standard. do not commence any work on any generation asset without a PTW issued by a Permit Issuer. comply with the conditions of the PTW. do not interfere with any control, HV isolation, Isolation or Personal lock(s) or safety isolation and control device placed in association with a PTW. practice safe behaviour. are involved in Job Risk Assessment for each task or as work conditions change. actively work with their Formal Leader to support the implementation of safety programmes.
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HORIZON POWER SECTION 5 Page 5-1 5 SAFETY PRINCIPLES 5.1 General All generation assets shall be regarded as operational until isolated. A PTW shall be issued before any work starts on any generation asset. All relevant instructions, procedures and conditions contained in a PTW shall be complied with when carrying out any work activity in any operational area. Hazards shall be identified and the associated risks assessed and controlled prior to working on any generation assets. The GPTWS shall be regularly audited to ensure compliance. All incidents which has or could have caused personal injury or damage to property shall be reported to the Recipient-in-Charge and the Formal Leader immediately. The safe approach distances to electrical apparatus for persons, vehicles and plant shall be adhered to at all times. 5.2 First Aid All personnel who work in Operational Areas or undertake Operational Work must be trained in First Aid. 5.3 Personal Protective Clothing and Equipment All personnel who work in Operational Areas or undertake Operational Work shall wear approved personal protective clothing and equipment in accordance with Horizon Power Minimum Personal Protective Clothing and Footwear Standard and the appropriate Safety field instruction in the Network Instruction Manual (NIM). Approved Personal Protective Equipment (PPE) specified for the task or work area shall be worn.
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HORIZON POWER SECTION 6 Page 6-1 6 ENERGY ISOLATION This section describes, what energy isolations are, how to prepare generation assets, use locks, other control measures and tags to ensure the isolation(s), once made, are adequately identified, de-energised, flow stopped, locked and/or physically restrained to prevent inadvertent operation of the generation asset(s). 6.1 General Isolations and/or controls are required where the work is to be carried out on generation assets where personal and/or generation asset protection is required. Additionally, isolation and/or control measures are required where stipulated in any other work instruction, procedure or manufacturer requirement (e.g. Permit-to-Work, JRA, Safety Case, Safety Management Plan, Non-routine Procedure, etc.). All isolations shall only to be carried out by an authorised Isolation Officer or HV Switching Officer. All isolation and control measures placed as part of PTW shall be arranged and managed by the relevant Permit Issuer responsible for approving the isolation(s) and issuing a PTW. All persons on site are responsible for complying with the requirements of all PTW conditions, as unauthorised removal of any Lockout or safety device may result in serious injury or death, equipment or environmental damage. An Electronic Control System (e.g. Programmable Logic Controller, SCADA System) or emergency stop/off switches shall not be used as the isolation and/or control point. Horizon Power s PTW isolation and/or control process is included at Appendix A. 6.1.1 Type of Energy isolations Energy Isolation can be classed into two main categories, that being: Mechanical Energy Isolation and Electrical Energy Isolation.
SECTION 6 Page 6-2 HORIZON POWER Mechanical Energy Isolation Mechanical energy can be in the form of Liquids, Gases and Vapours. There are many way in which mechanical energy can be isolated, such as: close a block valve to prevent flow and venting, draining or depressurising the isolated section, fix a blanking device to a pipe to prevent flow disconnect a pipe to prevent flow, and open a bleed valve to vent gas or drain liquid Blanking devices (blinds, spades & caps) shall be designed and rated for the system. All valves used as isolation and/or controls are required to be secured and locked and tagged. Where the energy source is a liquid or gas that may enter a confined space, it is recommended to remove a pipe spool between the source and Confined Space then blank off the energy source prior to entry. Note: Single block, double block and bleed valves shall not be relied upon as a form of isolation for Confined Space entry. Additional tags shall be attached to access covers removed to provide entry and ventilation to ensure they stay removed. Electrical Energy Isolation There are two main reasons for electrical energy isolations, that being, 1) Isolation to allow access to the driven machinery for non-electrical work and 2) Isolation to allow access to the normally energised plant for electrical work. Electrical energy will be classified as either Low Voltage (LV) or High Voltage (HV). LV is where voltage exceeds 50 volts (alternating Current) and less than 1000 volts (alternating current). For direct current the limits are between 120 volts and 1500 volts. High voltage is where voltage exceeds 1000 volts alternating current (a.c.) or 1500 volts direct current (d.c.). Isolation of equipment for electrical work is to be carried out by an authorised electrical person or authorised licensed electrical worker.
HORIZON POWER SECTION 6 Page 6-3 6.2 Identifying Isolation Points The Permit Issuer is responsible for identifying isolations that are necessary to access generation assets to undertake work activities. Isolation and/or control points for a particular generation asset or part thereof can be identified by the following means: review of the appropriate piping and instrumentation diagram (P&ID) review the appropriate electrical schematics review of the appropriate operating or manufacturers instruction manual review with the Operator performing system walk downs/visual observations In all cases, verify that the drawings and information used for the purpose of identifying isolations accurately reflect the current configuration of the generation assets. Checks shall also be undertaken to identify potential back feeds, reverse flows and interaction with adjacent equipment. Should cross boundary isolations be identified by an Isolation Officer or HV Switching Officer, the owner of the relevant equipment shall be contacted so that the interfacing isolations can be arranged and managed using an Operating Agreement. Where standard isolation procedures exist these should be carefully checked each time they are used to verify their accuracy prior to use. Where HV electrical isolations have been identified, a HV Switching Programme shall be completed. A HV Switching Programme is a logical sequence of events which shall be followed to isolate the HV electrical system and shall be used to make specific electrical apparatus:- de-energised prior to work commencing energised following completion of work supplied by different incomers and/or distribution feeders Note: Switching programmes for known situations which have been checked and approved by a HV Switching Officer must be verified by a second authorised person on each occasion prior to use to ensure that conditions regarding the equipment and drawings have not changed.
SECTION 6 Page 6-4 HORIZON POWER 6.3 Isolation Procedure Requirements To effectively isolate, control or restrain generation assets or block access to an operational area the Isolation Officer and/or HV Switching Officer shall, by using approved safe methods, ensure that: the equipment is shut down or de-energized all sources of energy are isolated the isolation is tested and proved. isolation and/or controls are secured with Isolation Locks and tags. Release the potential stored energy of springs when applicable. identify and isolate automatic operation of the generation asset(s). 6.4 Locking Isolations Where generation assets are isolated, the isolation and/or control measure shall physically restrain from movement, locked out and identified. In all cases a multi lock hasp shall be used to facilitate the application of Isolation Lock(s). All keys to Isolation Locks shall be placed in a Lockbox and secured with a Control Lock. A Personal Lock shall be applied to the Lockbox by the Recipient-in-Charge and Recipient(s) to provide additional security and prevent access to the Isolation Keys. All Personal Locks shall also be fitted with a personal Danger Tag to identify the owner of the lock.
HORIZON POWER SECTION 6 Page 6-5 Figure 2 Cascade Isolation Arrangement The Permit Issuer may waive the use of a Lockbox for Single Point Isolations. In this case a multi lock hasp shall be used to facilitate the application of the Recipient-in- Charge and Recipient(s) personal Locks on the same single isolation and/or control point. (Refer to Figure 3). The Permit Issuer shall retain the isolation lock key. Figure 3 Single Point Isolation
SECTION 6 Page 6-6 HORIZON POWER 6.5 Remove Isolation Before Lockouts are removed from isolation and/or control points to enable energy to be restored to the generation assets, the following sequence shall apply: inspect the area to ensure that non-essential items have been removed, the equipment components are intact and the generation asset(s) is operationally ready. check the work area to ensure all personnel are clear ensure PTW and Supplementary Permits issued for the work have been signed off and cancelled. remove all Isolation Locks from the isolation and/or control points and return the generation asset to its normal operating status. record the isolation and/or control removal on the relevant Permit-to-Work Note: It is recommended that the de-isolation is done in reverse order to prevent introducing a hazard prior to the completion of the de-isolation. 6.6 Removal of Locks All locks placed shall be unlocked with the dedicated key for that lock. 6.6.1 Person or Key Missing Where the person or dedicated Personal or Isolation Lock key cannot be found and the Isolation Lock is required to be removed, the lock can only be removed by the Formal Leader once the following steps have been taken: all personnel protected by that lock are identified and notified. the environment protected by the lock is proved safe. the asset protected by the lock is proved safe. the missing person is notified and not expected to return to site. search for the dedicated key is unsuccessful.
HORIZON POWER SECTION 6 Page 6-7 6.6.2 Emergency Where an emergency requires the overriding of any lock, the relevant lock may only be removed by the Formal leader once the following steps have been taken: all personnel protected by that lock are identified and notified, and the environment protected by the lock is proved safe, and the asset protected by the lock is proved safe. In all cases where a lock is removed by force, the Emergency Lock Removal form shall be completed and filed with the PTW. 6.7 Isolation Tags The Isolation Officer shall place an Isolation Tag on all isolation and/or control points and identify and record the necessary PTW or Supplementary Permit details on the tag. As a minimum each Isolation Tag shall list the tag number, PTW number, equipment tag number and /or brief equipment description.
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HORIZON POWER SECTION 7 Page 7-1 7 PERMIT TO WORK This section describes how to prepare issue, accept, work under, transfer, suspend, relinquish cancellation and close a PTW and Supplementary Permits. The PTW flow diagram are shown in Appendix B. A Permit-to-Work is not required for: Routine testing, inspection or fault finding work that does not require Isolation and/or Control. People undertaking ground maintenance activities in a non-hazardous location of Horizon Power generation site. Some supplementary permit(s) may still be required to comply with the Safety and Health Management System. 7.1 General A PTW is an authorisation to do work. An integral function of the PTW process is to record all isolations and other controls that are required to perform the work safely. A PTW is required at all times where: isolation and/or control of a generation asset are required to carry out a work activity. operational work is carried near a generation asset, i.e. excavation work. where work is to be performed of a hazardous nature or in a hazardous location. when stipulated in any other Horizon Power document. (Safety Case, Safety Management Plan, JRA, Non-routine Procedure, etc.) A person working under the authority of a PTW shall be responsible to carry out that work under the conditions contained in the work permit. In addition to a PTW, Supplementary Permits are also required for specific high risk activities or specific activities in hazardous locations. Supplementary Permits are used for the following: Confined Space Entry. Hot Work in hazardous areas. Excavation and Trenching. Sanction-to-Test. HV Electrical Access. Operating Agreement (OA).
SECTION 7 Page 7-2 HORIZON POWER 7.2 Preparation of a Permit-to-Work A PTW including Supplementary Permits may only be completed and issued by a Permit Issuer. On request for a PTW, the Permit Issuer shall prepare the PTW, Supplementary Permits (where required) and organise for an Isolation Officer and/or HV Switching Officer to undertake the necessary isolations and provide any special controls. The generation asset(s) to be worked on and the scope of work are to be recorded on the PTW. No work outside of the defined PTW scope of work will be allowed. Identify the isolations required to safely perform the work in accordance with the Isolation requirements described in Section 6 of this procedure. Record the identified isolation and/or controls (with generation asset item description and tag number whenever possible), the number of the Lockouts used and the safe position of each point of isolation in section 3 of the Permit-to-Work. Where there is insufficient space an Isolation Continuation Sheet shall be completed and attached to the Permit-to-Work and indicate this on the PTW. (An Isolation Continuation Sheet is an extension of Section 3 of a Permit-to-Work). 7.3 Isolation The Isolation Officer or HV Switching Operator shall carry out the isolations and update the relevant column in section 3 of the Permit-to-Work for that isolation to indicate that it has been applied. Where HV isolations are required, a HV Switching Operator must complete a HV Switching Programme. These HV isolations shall be indicated in Section 3 of the PTW. A copy of the HV Switching Programme shall be attached to the PTW. Where Supplementary Permits are required to facilitate additional safe conditions, update Section 4 of the PTW as the circumstance requires, identifying the type of Supplementary Permit and its number. The Isolation Officer or HV Switching Operator shall apply the Blue Control lock with an Isolation Tag to the associated Lockbox. (Note: Except for a single person remote site the Isolation Officer and HV Switching Operator can also be the Permit Issuer) The Permit Issuer shall verify that all of the required isolation and/or control measure(s) have been established in the field and recorded on the specific permit. After the permit conditions have been verified the Permit-to-Work is ready for issue.
HORIZON POWER SECTION 7 Page 7-3 7.4 Issuing a Permit to Work The Permit Issuer shall always ensure that Recipient-in-Charge acknowledges the PTW conditions and the isolation and/or control measure(s) before issuing the PTW. The Isolation officer/hv switching officer shall: Place the keys for all HV and/or Isolation Locks in the relevant Lock Box and lock the Lockbox with a Control Lock. And record the following in Section 5 of the PTW: the date and time the PTW was issued the date and time to which the PTW can remain valid Issuer Name, sign and date the PTW. The Permit Acceptor shall sign the Permit Acceptance section of the Permit to Work. Note: Without signatures in the Permit Issue and Permit Acceptance sections, the PTW is invalid. The PTW, Supplementary Permits and associated paperwork shall be handed over to the Recipient-in-Charge for ongoing control until relinquished for Cancellation back to a Permit Issuer. 7.5 Storage of a Permit to Work The Recipient-in-Charge shall place all documentation on the Permit Board located adjacent to the associated Lock Box. 7.6 Working Under a Permit to Work Where a single person signs as the Recipient-in-Charge of a PTW, they will accept responsibility for the PTW and will not work outside of the conditions and the isolation and/or control measure(s) of the PTW. Where a person signs as the Recipient-in-Charge of a PTW in a work group of Recipients, they accept the responsibility as the person in charge of the work.
SECTION 7 Page 7-4 HORIZON POWER The Recipient-in-Charge shall be responsible for: Ensuring that all Recipient(s) are fully aware of the conditions, the isolation and/or control measure(s) of the PTW, and All members sign onto the PTW. The Recipient-in-Charge shall actively monitor the Recipient(s) activities to manage overall safety. Additional isolations are permitted to be added to the PTW only after agreement between the Recipient-in-Charge, the Permit Issuer and Isolation Officer. Where additional isolations are agreed, the details of the additional isolations must be recorded on the PTW and any working copy. All Recipient(s) must be informed of the additional isolation(s). All Recipient(s) who have signed onto a PTW shall attach a Personal Lock to the Lockout Hasp on the Lockbox associated with their PTW. Personal Locks shall only be placed in accordance with the provisions of the PTW Isolation Procedure in Section 6 of this standard. Persons who are required to permanently leave the work site cannot do so without firstly signing off the PTW and removing their Personal Lock and Danger Tag from the Lockbox. This is to ensure that if the work is completed in their absence the PTW can be signed off as complete and cancelled. Any person, who leaves the site without signing off a PTW or without removing their Personal Lock, will be required to return to the site to do so. Where such persons cannot be found or brought back to site, the Emergency Lock Removal steps outlined in Section 6.6.1 of this standard are to be followed. 7.7 Relinquishing a PTW for a STT The STT shall be initiated by the Recipient-in-Charge and in conjunction with a Permit Issuer. Although the STT Recipient-in-Charge is generally in charge of the test, the Permit Issuer is responsible for ensuring the equipment being tested is in an adequate state prior to issuing a STT Permit. This adequate state prior to the issuing of the STT Permit, the Permit Issuer shall ensure that: All plant and equipment is clear of the Worksite, All supplementary permits have been relinquished. All person(s) working under the PTW have been withdrawn and signed off the PTW
HORIZON POWER SECTION 7 Page 7-5 All necessary guards and protective devices have been replaced where possible. The generation asset or part thereof is ready for testing or adjustment, and The Isolation Officer shall record all Isolation and/or Control measures that have been removed on the PTW. Permit Issuer issues the STT Permit to the Recipient-in-Charge. Note: If the test or adjustment involves HV isolations, then only an Authorised HV Switching Officer may perform the task under the STT Permit. If work under the PTW needs to continue on completion of the test(s) or adjustments, Section 8 of the STT Permit form shall be completed and the Permit Issuer shall arrange for the Isolating Officer to have all isolations re-instated, recorded on the PTW and verified to comply with the PTW. The Permit Issuer will reissue the PTW and all Recipient(s) are to re-sign the PTW. If the test or adjustment is completed and the job is complete, the STT Permit and the PTW may be signed off as cancelled and closed together, with the Generation Asset(s) being returned to service. 7.8 Cross Boundary Permit and Lockout Requirements Where an external operator has requested isolations within the generation boundary the following shall apply: The Permit Issuer shall prepare the Operating Agreement (OA) and arrange for an Isolation Officer or HV Switching Operator to undertake the isolations and/or controls. The Isolation Officer shall undertake the required isolations in accordance with the GPTWS standard. The Issuing Officer shall issue an OA to the external operator s Recipient-in- Charge. The external operator OA Acceptor shall check all isolations prior to accepting the OA. The external operator s OA Acceptor shall place their Personal Lock to the Lockbox to provide additional security and prevent access to the Isolation Keys.
SECTION 7 Page 7-6 HORIZON POWER On completion of the task the OA shall be cancelled in accordance with the GPTWS standard. The external operator s OA Acceptor shall remove their Personal Lock in accordance with the GPTWS standard. 7.9 Transferring Responsibility of a Permit to Work The PTW may be transferred to another Recipient-in-Charge by completing Section 10 of the PTW. The departing Recipient-in-Charge must notify the Permit Issuer of the change before transferring the PTW. The departing Recipient-in-Charge shall always ensure that the incoming Recipient-in-Charge acknowledges the PTW conditions and the isolation and/or control measure(s) before transferring the PTW. The departing Recipient-in-Charge must remove their Personal Lock and Danger Tag from the Lockbox. If the permit transfer section is not fully completed, the PTW is invalid. 7.10 Relinquishing a Permit to Work The Recipient-in-Charge is responsible for ensuring that all Recipient(s) have exited the work area, that the work has been completed and that the generation asset is ready to be placed back into service. All Recipient(s) are required to have signed off the PTW and any Supplementary Permits, and then remove their Personal Locks from the Lockbox. (This includes the Recipient-in-Charge removing their lock(s) if placed). The PTW and any Supplementary Permits may be relinquished by the Recipient-in- Charge by signing the appropriate section of the Supplementary Permit(s) and Section 7 of the PTW. The PTW and Supplementary Permits shall be removed from the Permit Board and returned to the Permit Issuer for closure and record keeping.
HORIZON POWER SECTION 7 Page 7-7 7.11 Cancelling a Permit to Work The Permit Issuer must ensure that the PTW and any Supplementary Permit(s) have been completed in accordance with this GPTWS standard. The Permit Issuer shall instruct an Isolating Officer to remove the isolation and/or control measure(s) placed in association with that PTW. The Isolating Officer shall initial/sign the Remove column in Section 3 of the PTW to confirm that the isolation and/or control measure(s) have been removed. The Isolating Officer shall return the PTW form and associated Supplementary Permits including all Isolation Tags to the Permit Issuer. The Permit Issuer may then sign the permit cancellation section of the PTW, and file all documentation for record keeping and auditing.
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HORIZON POWER SECTION 8 Page 8-1 8 SUPPLEMENTARY PERMITS 8.1 General Supplementary Permits (7.2 7.7) are an authorisation to do specific activities and are used to record the additional controls specific to the high risk tasks they are associated with. Refer to other Horizon Power procedures for additional instruction for the high risk activity the Supplementary Permits are provided for. Where Supplementary Permits are required they shall be issued, accepted, relinquished and cancelled using the same process as a PTW. Supplementary Permits shall only be issued in conjunction with and referenced on the PTW. If a PTW is cancelled in accordance with 6.10, the Supplementary Permit must be cancelled at the same time. 8.2 Hot Work Permit A Hot Work Permit is required where hot work is to be carried out on or near any generation asset(s) in hazardous zones or where identified by the Permit Issuer. Hot work may include but is not limited to: Use of mobile phone, cameras, power tools and other non-intrinsically safe equipment. Use of all forms of electric/gas welding and cutting processes. Operating plant and machinery driven by a combustion engine. Use of tools that generate a spark during impact or use. Any vehicle and equipment that may generate an ignition source. 8.3 Confined-Space Entry Permit A Confined-Space Entry Permit is required where persons are required to enter into any declared Confined Space. The definition of a Confined Space in AS 2865 is any enclosed or partially enclosed space that is not intended or designed primarily for human occupancy, within which there is a risk of one or more of the following: An oxygen concentration outside the safe oxygen range. A concentration of airborne contaminant that may cause impairment, loss of consciousness or asphyxiation. A concentration of flammable airborne contaminant that may cause injury from fire or explosion. Engulfment in a stored free-flowing solid or rising level of liquid that may cause suffocation or drowning.
SECTION 8 Page 8-2 HORIZON POWER 8.4 High Voltage (HV) Electrical Access Permit The HV Electrical Access Permit is designed to be used by personnel who are required to access HV Electrical Generation Assets. No Horizon Power employee or authorised contractor shall work on HV electrical apparatus which is energised or is capable of being energised. Access is permitted only after the electrical generation assets have been isolated, proved de-energised, earthed by approved methods, locked where practicable and danger or isolation labels fitted. 8.5 Excavation and Trenching Permit The Excavation Permit is designed to be used by personnel who are required to carry out excavations or trenching where there is a risk of damage to underground generation assets. A site survey must be undertaken to identify if there are any buried services prior to any excavation work being undertaken. All buried generation asset(s) shall be identified, located, proved and where possible isolated. Where generation asset(s) have been identified an Excavation and Trenching Permit will be required. All buried Generation Asset(s) and their controls shall be recorded on the Excavation and Trenching Permit. An excavation or trench by virtue of other hazards may also be classified as a Confined Space. This is generally as a result of atmospheric contamination, engulfment, flooding etc. Where the excavation or trench is classified as a confined space, a Confined Space Entry Permit will be required by personnel required to enter these excavations. 8.6 Sanction-to-Test (STT) Permit The STT Permit is designed to be used by personnel who are required to test new, reconditioned or existing generation assets on which tests are to be conducted. A STT is required when, in order to complete the work described in the PTW, the release of one or more isolation and/or control measures by an Isolating Officer is required so that energy supplies can be used to complete the test or adjustment. The STT allows access to generation assets for the fitting, operating and removal of test devices.
HORIZON POWER SECTION 8 Page 8-3 Any alterations to the manner in which the generation assets have been isolated are permitted only with the knowledge and approval of the Permit Issuer, who may give written instructions on the STT. The STT cannot be issued in conjunction with an HV Electrical Access Permit for the same apparatus, as the testing procedure may require a voltage to be applied. Note: Only the minimum number of Isolation Locks and / or HV Isolation Locks shall be removed to conduct the required test or adjustment. 8.7 Operating Agreement An Operating Agreement (OA) is an agreement between two Operating Authorities, for example, Horizon Power as a generator and Horizon Power as a network operator or an Independent Power Producer (IPP) as a generator and Horizon Power as a network operator. It is used to confirm that an electrical apparatus operational state will be held in an agreed state until the OA is cancelled. An OA is used when one party needs to work on an item of plant or electrical apparatus which requires isolation and/or earthing from an adjacent Operating Authority. The Operating Agreement recipient shall verify the isolations and earthing points stated on the Agreement, and may apply additional locks and tags. An OA is not a work permit. It does not authorise work to be undertaken. A work permit must be issued to allow work to take place. The conditions stated on the work permit must reference the OA. An OA is issued by a switching operator. For standard outages, the outage requestor will write the associated switching program, unless otherwise agreed. For the commissioning of other Operating Authority apparatus, Horizon Power will usually write the switching program. The issue and relinquishment of Operating Agreement must be recorded as steps in the switching program.
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HORIZON POWER SECTION 9 Page 9-1 9 REMOTE SITE PERMIT TO WORK REQUIREMENTS 9.1 General Typically Horizon Powers generation assets at remote sites are maintained by single person operators thus making the issue and receipt of Permits difficult. To cater for sites that are operated and maintained by a single person, the PTW will be issued and authorised from a Horizon Power representative. The Horizon Power representative issuing a PTW from the District (not at Generation site) shall be a Permit Issuer. A PTW can be issued and authorised by phone (refer to Section 5 of the PTW form). All isolations at the remote sites are to be carried out in accordance with this GPTW standard. Persons accepting a PTW, preparing equipment and undertaking isolations and/or control measures at remote sites shall be trained and authorised to undertake isolations and HV switching operations. 9.2 Preparation of Permit to Work The remote site operator shall complete Sections 1, 2 and 4 of the PTW form listing all the required isolations as identified in the site specific standard isolation procedures. Note: The remote site operator may also be required to undertake non-standard isolations by completing Sections 1 to 4 of the PTW. Once the PTW has been prepared, the remote site operator is required to contact the Horizon Power representative by telephone, fax or email to have the PTW checked and approved by a Permit Issuer. Prior to approving a PTW the Horizon Power representative Permit Issuer shall verify the accuracy of the proposed isolations or controls to be applied by checking the information against the current drawings, and isolation procedures for the nominated remote site. If the Horizon Power representative Permit Issuer is of the opinion the remote site operator has identified the appropriate isolations and controls to complete the works, the Horizon Power representative Permit Issuer shall log the scope of work & date in the Permit to Work Register and issue a permit number for the remote site operator to use on the PTW form.