Name: Phil Langlois Position: Lead Electrical Engineer, Ontario Operations

Transcription

1 Page of 8 Training Code (N/A): Document Owner: Name: Phil Langlois Position: Lead Engineer, Ontario Operations Table of Contents.0 PURPOSE APPLICATION EXCEPTIONS REFERENCES DEFINITIONS FIELD EQUIPMENT BEING PERMANENTLY TAKEN OUT OF SERVICE EQUIPMENT REMOVALS - GUIDELINES EVALUATING EQUIPMENT AFTER LONG PERIODS OF DISUSE APPENDICES... 7 Appendix A: Revision Notes and Approvals... 8

2 Page 2 of 8.0 PURPOSE This procedure describes the process for dealing with electrically powered or electrically controlled equipment being placed out of service. It is meant to offer standardization from site to site and to bring existing practices to best practice levels. Where it makes sense to do so, guidelines have been offered for judging when removals should be considered. 2.0 APPLICATION This procedures is applicable to all Vale Ontario Operations. Over the course of a mining site s life, it is common for electrical equipment or electrically controlled equipment to be added, replaced or taken out of service and then sometimes removed. The site s ongoing day-to-day operation will dictate what new equipment is installed or which equipment needs replacing. These requirements are always changing and thus also dictate when the installed equipment is no longer required and can therefore be taken out of service permanently. There is sometimes a need or opportunity to remove this out of service equipment. This procedure does not identify requirements for Vale s Asset Disposal Process or requirements to update Vale s ERP (SAP). In all cases, the plant s Maintenance Divisional Support person must be notified to initiate the Asset Disposal Process and update the ERP (SAP) equipment registry as required. 2.. EXCEPTIONS None

3 Page 3 of REFERENCES The following references were used in the development of this document or are related to it. CSA-M42- Use of electricity in mines (section#4.2.4) CSA-Z463-3 Guideline on maintenance of electrical systems (section#7.7) OESC-2 Ontario Safety Code, Part I (section#2-4) Bulletin (OESC sections 2-26, 2-4 & ) NFPA-70B-0 Recommended Practice for Equipment Maintenance (section#2.3.6) Vale s West Mines Standard 999- Vale s Smelter Standard Job Procedures: 6RU206: Low Voltage Cable/Starter Removal Procedure 6RU4506: Protocol for Leaving Motor Leads Disconnected Vale s MGUID Maintenance Best Practice Guideline 4.0 DEFINITIONS Durable label: O.O.S.: White label which can withstand the environment it is subjected to. The writing on it will also be legible for the duration of the tag s existence. Out Of Service temporarily or permanently not required.

4 Page 4 of FIELD EQUIPMENT BEING PERMANENTLY TAKEN OUT OF SERVICE There are many examples which could satisfy this condition. Whole processes could be upgraded making the original equipment standby or contingent, inactive mine headings, equipment salvaged for re-sale, etc. When electrical equipment has been deemed as Out-of- Service (O.O.S.), the following process shall be followed: ) Safely de-energize the source following the ZES program from the substation, switch room or splitter. It is implied that proper voltage testing techniques will be used, that proper shock and arc flash PPE will be worn and that site specific safety precautions will be followed. 2) Update the switchgear s labeling to show the equipment is still connected but O.O.S./defective/removed/etc. Do not label the switchgear as spare if the previous equipment s cabling, etc. are still present. 3) If the switchgear contained power fuses, remove them. 4) Make those same updates to the switch room tagging book sheet. 5) Make those same updates to the drawings. 6) Power and control cables need not be removed at this stage. 7) Specifically In the case where the equipment is fed from 20/208/240vac distribution panels, the individual breakers shall be safely opened and status tagged following the ZES program. The panel schedule and associated drawings shall be updated to show that the equipment is still connected but that it is now O.O.S./defective/ removed/etc. Plans will be put in place to have this wiring removed from the panel enclosure and either cut short enough to prevent re-entry (and durable label attached) or removed in its entirety. In the case where the equipment is an overhead line, the source shall be safely deenergized and then status tagged following the ZES program. The insulated cable shall be disconnected from the overhead line, all phases shorted together and then fastened at the elevated position (and durable label attached). The overhead line shall be permanently grounded or removed. As soon as possible or during the next planned maintenance outage, the disconnected insulated cable shall be removed in its entirety. Drawings and tagging sheets shall be updated at every stage of the work. This work will require the assistance of the Power Department s Line Gang.

5 Page 5 of 8 In the case where the equipment is a damaged cable that is no longer fit for duty, it shall be safely de-energized, disconnected from its supply, removed from the supply source enclosure and cut short to prevent re-entry. The source breaker cell, starter or switch identification shall be changed to show that it is a spare if not used to re-feed the same equipment. The wiring left in place shall be identified as (O.O.S.-defectiveshorted or grounded, etc.) with durable labels at both ends indicating also the old power supply source and the previous usage. The cable s conductors shall be shorted, taped together or enclosed in an approved boot/cover at an equivalent insulating value to that of the original cable insulation. In the case where the equipment is a Mine Power Center (MPC) located underground (or any humid location negatively impacting air-cooled coils), the incoming switch shall be status tagged following the ZES program to indicate that the MPC cannot be reenergized without cleaning it, drying the transformer coils and commissioning the low voltage breakers and their phase & ground fault relays. The fused switch feeding this O.O.S. MPC shall also be opened, fuses removed and tagged following the ZES program. The site should avoid using the MPC incomer as junction box. In the case where the equipment is an electrical motor connected to a machine such as a pump, fan, conveyor, etc., the field disconnect switch shall not be used to isolate the field equipment. The main supply shall be safely de-energized following the ZES program, the fuses removed and the power/control cables disconnected. Status tag the supply to show that the fuses have been removed and that the equipment is now O.O.S. Update the tagging book and drawings. Where the supply uses a molded case circuit breaker, power fuses are not present. 6.0 EQUIPMENT REMOVALS - GUIDELINES When equipment removals are being contemplated, consider the following guidelines: ) 20/208/240 panels: old Push-Matic Bulldog panels should not be re-energized once taken O.O.S. Newer brands which have been de-energized should not be energized if their enclosures are in poor condition or if their doors cannot be closed. 2) Low voltage breakers (<750volts) which contain dashpot protection relays should not be placed back into service. Consider converting them to solid state protection relays capable of being tested using secondary injection. During this conversion process, consider eliminating as much of the asbestos as possible from them. Alternatively, new breakers can be purchased.

6 Page 6 of 8 3) Low voltage starters (<750volts) which contain two overloads shall not be placed back into service. Older style starters containing asbestos (e.g. CCL) should not be placed back into service either. Old equipment conveniently located on energized racks should not be used if its condition cannot be ascertained. During switch room inspections, a yearly list can be made of old O.O.S. starters and fused switches which need to be removed or replaced by new equipment during annual shutdowns. 4) High voltage breakers (>750volts) which are air circuit breakers are typically heavy and ergonomically unfriendly. They may also contain asbestos. Consider having them retrofitted to vacuum technology before placing them back into service. 5) High voltage starters (>750volts) which contain air contactors shall not be placed back into service. These older style starters containing asbestos should be retrofitted to vacuum technology. 6) Power and control cables: In order to keep tray loading or messenger loading to a minimum, consider removing cables which are no longer required. Removing the congestions inside trays and allowing space between cables may allow reducing the de-rating factor. 7.0 EVALUATING EQUIPMENT AFTER LONG PERIODS OF DISUSE equipment that has been O.O.S., stored and not used or maintained for a period of time exceeding 3 years should be thoroughly tested before being placed back into service. The testing should be documented and filed.

7 Page 7 of APPENDICES Appendix A: Revision Notes and Approvals

8 Page 8 of 8 Appendix A: Revision Notes and Approvals The Revision Notes and Approvals table only displays the latest revision number and a list of the last revisions made to the document. For details on previous revisions contact the document owner. Rev Revision Notes Last Revised by: Phil Langlois, June 207 New standard Approvals Name and Position Date Document Owner Phil Langlois, Ontario Operations Lead Engineer June 30, 207 Ontario Maintenance Leadership Group Glen O Neill, Manager Maintenance Engineering (Surface) Dave Duczeminski, Manager Maintenance Engineering (Mines) June 30, 207 Ontario Operations Bruce Bichel, Manager Production Services & Support June 30, 207