maintenance manual:Work permits (security)
From MyCMMS WIKI
Work permits are any form of authorization/notification that all precautions/limitations have been addressed and the work area/condition/safety concern has been secured from a safety standpoint. Work permits take into account the scope of the Work Package/Task activity and the affected area/component and address specific areas of safety (i.e., fire protection, air quality, scaffold erection, system/component isolation, etc.). Work permits are first and foremost for the protection of personnel. In addition, work permits ensure the protection of company assets.
The Shift Foreman is responsible for the implementation of the Clearance Procedure. The Shift Foreman will control, issue and release all clearances. Operations personnel are responsible for the development of clearance boundaries/tags associated with safety securing a system or component(s).
Planners are responsible for identifying those Work Package/Tasks that require a clearance and requesting Operations to develop a clearance.
Craft personnel are responsible for assuring the clearance properly secures the system/component being worked and signing on and off the clearance.
Plant Management should assure that all personnel are adhering to the requirements established in the Clearance Procedure.
This guideline outlines the process and responsibilities associated with the initiation, development and control (issuance and release) of clearances. Clearances provide a method of physically and administratively securing plant systems and components to assure personnel safety while performing maintenance or other work activities.
During the maintenance planning process, the planner will determine the requirement or need for a clearance based upon:
- The RIT /WR initiated and reviewed by the Shift Foreman.
- The affected component/system associated with the Work Package/Task.
- The work activities to be performed.
Once the Work Package/Task is scheduled, the planner will request Operations to develop a clearance. Operations personnel will develop the clearance boundaries and generates the associated tags. Usually (depending upon the extent of tagging to be performed), the night before the Work Package/Task will be worked, Operations will tag-out the appropriate components. After the Work Package/Task assignment to the craft personnel, the craft personnel will walkdown the clearance boundary with an Operations individual and verify that the system and/or component(s) identified on the Work Package/Task is safely secured and the established clearance will protect them. The craft person will sign-on to the clearance book located in the Shift Foreman's office in the War Room and proceed with the work activities. Once the Work Package/Task is completed, the craft person will notify the Shift Foreman and sign-off the clearance. After all system/component testing (Trial Operation) is complete, the Shift Foreman/Scrubber Supervisor will release the clearance.
Thorough familiarization with the work process and any associated hazards that may be encountered within the confined space and the immediate work area. Develop the work instructions relative to potential hazards and accident prevention methods. Appropriate tagging, applying barrier tapes or barriers at all openings to the confined space and any surrounding controlled areas. Providing appropriate "Clearance Procedure" functions. Appropriately complete and post the "Confined Space - Safety Check Sheet" and collaborate with the Safety Supervisor as necessary with reference to hazard analysis, work rules, protective equipment/ or other/special worker safety applications.
Advise and counsel supervisors and workers concerning general safety and health matters pertaining to confined space work and activities. Conduct or assist in conducting atmospheric testing of confined space and associated work rules or applications. Determining or assistance in determining restrictions or applications for fire/explosion protection relating to confined space especially in cases of welding or open flame work where combustible dust of flammable vapors may be present. When deemed necessary, revisions or exception to standard procedures herein will be granted on a case by case basis with the approval of Management and Safety Supervisor.
All personnel will follow safe work practices and assist in control and protection of other workers in confined space operations. Apply appropriate warning tags and other means of safety notification for personal and co-worker safety.
Plant Management will assure that safe practices and rules are followed and that appropriate survey and protective equipment are provided for the safety of confined space work.
Confined space - A space that is sufficiently surrounded by confining spaces so as to:
- Permit either the accumulation of hazardous gases, mist, fumes, vapors, dust the combination of each or the possible deficiency of oxygen to exist.
- Restrained access of a worker to the degree that it would be difficult to escape in the event of an emergency.
- Examples of a confined space would be ovens, furnaces, degreaser tanks, tanks, tank cars, tank trucks, closing bins, silos, bunkers, hoppers, vaults, certain shafts, service tunnels, man-hole, certain pits, boilers, and other structures or cavities not normally entered or considered a routine work area.
- Clearance Procedure - The operations safety procedure and associated tagging system for shut-down of equipment and marking, tagging, or locking of energy controls to the equipment.
Clearance Tag - A shut-down or do not operate Red Tag denoting the equipment down, man working, etc. Man Inside Tag - A Yellow Tag indicating a worker is inside a confined space operation. Safety Check Sheet - A listing of confined space safety considerations, information, and acknowledgment associated with a confined space operation.
Requester - The work supervisor or individual responsible for initiating the clearance for the work or: operation associated with the confined space work or operation.
The initial tag requester and/or workers involved in confined space work will seek advice from the Safety Supervisor when there is any question regarding safe atmospheric conditions of the confined space and will inform and make arrangement for any needed testing or confined space examination. An atmospheric condition will be termed hazardous if such examination finds:
- Oxygen content is below 19.5% by volume.
- Combustible vapor or gas is greater than 20% of the lower explosive limit.
- Toxic material analysis is above the Threshold Limit Value (TLV)
- Where there is the presence of any flammable vapors, dust, or chemicals there will be no welding, burning, open flame, spark producing equipment or operations, general lighting equipment (other than atmospheric approved) allowed until such time as the conditions or atmosphere are positively removed or controlled.
- For any confined space 'With power driven internal equipment the power source for the equipment will be appropriately disconnected, locked out, and/or tagged per "Clearance Procedure".
- Whenever a work is required to enter a confined space where there is endangerment of slip, trip or fall to a different level of more than four feet, an approved life belt and line will be used with a life line of strength of at least 1/2" manila rope-except:
- When the concentration of structure members are such that fall would be prevented or obstructions to free travel within would be such to make the life line useless
- Where concentration of workers is such to cause entanglement and would impede rescue; and
- Where there are catwalks, decking or other secure and adequate footing to prevent fall
- The user prior to use will inspect lifelines and belts for rips, tears, wear or damage. Faulty belts or line will not be used and will be immediately reported to the worker's. Supervisor.
- Faulty life belts or lines will be removed from service and destroyed beyond use. Lifelines or belts will not be repaired.
Safety Check Sheet
- A Safety Check Sheet will be prepared for each confined space operation. Instructions are on the reverse side of the Safety Check Sheet form.
- The Safety Check Sheet will be prepared and signed by the tag or operation initiator (work supervisor) and acknowledged by all workers who are assigned to or work in the confined space.
- The Safety Check Sheet will be conspicuously posted at or near to the confined space entry point or immediate work site for review, information, and work identification.
- All workers assigned to the confined space work will sign-in/ out on the Safety Check sheet at start and completion of their work assignment and shall post their "Man Inside" tag(s) at the entry point(s) of the confined space. Any other person entering the confined space will likewise sign-in/ out and display the tag appropriately when in the confined space.
Closing Confined Space
- When work on or in a confined space is completed with responsible tag requester (work supervisor) concluding the worker will inspect the space for tools, equipment, materials, and personnel prior to dosing or securing.
- No confined space will be closed while a "Man Inside" tag is displayed and/or the worker not signed off the Safety Check Sheet.
- In the event a signed-on worker or a Clearance Tag or “Man Inside” Tag remains active at the time for confined space closing the worker will be contacted to appropriately remove the tags and sign-off. In the event the worker is unavailable, the worker tags and sign-off may be accomplished by a secondary means. For example:
- All reasonable efforts must be made to contact the worker to return to the site to remove the “Man Inside" tag and sign-off the Safety Check Sheet.
- In the event a worker can not be contacted or can not return to the site, then the Shift Foreman with the initial tag requester may authorize a Superintendent, Plant Engineer or Plant Manager to remove the tags and sign-off for the absent party only after walking the system down, seeing that it would be safe to operate and positively assuring that the confined space is fully clear of any workers or personnel.
All completed Safety Check Sheets will be forwarded to the Safety Supervisor for record and file. “Man Inside” Tags and Safety Check Sheets are available in the Shift Foreman's office located in the War Room.
All tagging will be performed by Utility Power Plant Designated Scaffold Competent individuals. Three (3) tags will be used:
- Hold Tag- Yellow (for testing or rework)
- Okay Tag - Green (approved for use)
- Reject Tag -- Orange (Do not use)
During the erection of scaffolding, the Hold (yellow) tag will be attached to the scaffolding at all points of access. When erection is complete, the designated scaffold component person will inspect the scaffolding and, if it meets OSHA Guidelines (29 CFR 1926.451, Subpart L) will hang an Okay (green) tag at all points of access. If the scaffold does not meet the OSHA Guidelines, the competent person will attach the Reject (orange) tag at all points of access.
When the scaffold erection crew returns to make the appropriate corrections, the competent person will change the tag to the Hold (yellow) tag. The only personnel allowed on the scaffold with a Hold tag are scaffold competent persons and the erection crew.
As long as a tag is attached to the scaffold, the bottom perforated section of the tag (matching numbers) with the location of the scaffold on the back of the tag will be hung on a designated board in the War Room. When a tag is removed from the scaffold for any reason, the bottom portion of the tag will be removed from the board.
As long as the scaffold is erected or in any phase of erection, a tag or tags will be in place at all points of access. No personnel shall access any scaffold unless a tag is hanging at the point of access.
Cutting & Welding
The Maintenance Foremen, Maintenance Supervisors, Superintendent of Maintenance, Construction Supervisor, and Safety Supervisor are authorized to issue cutting and welding permits.
Craft personnel will assure all work practices are in accordance with the requirements outlined in the Cutting & Welding permit.
Plant management will assure that work associated with cutting and/or welding is controlled in accordance with this guideline.
This guideline outlines those activities developed to prevent fire and other hazards from occurring due to the use of cutting or welding equipment. Areas especially susceptible to fire are the coal handling systems, pulverizes, fuel oil system, lube oil systems, hydrogen system and any area containing a flammable or combustible substances.
Whenever a need for welding or cutting in a hazardous area has been identified, one of the authorized personnel will be contacted for inspection of the proposed cutting and welding area and issuance of the cutting and welding permit.
Precautions at the work area will include a swept floor clear of combustibles, combustible floor wet down, covered with damp sand or fire resistant sheets.
Flammable liquids will be removed and other combustibles will be protected with fire resistive blankets or metal shields.
A Fire Watch will be provided during the performance of work activities and for thirty (30) minutes after the work is completed. The Fire Watch will be supplied with a fire extinguisher and trained in its operation as well as in sounding an alarm.
Once a cutting and welding permit has been issued, the yellow tag is to be hung in a clearly visible location at the cutting and welding work location. A cutting and welding expose checklist will be filled out and retained by the person issuing the permit. When work is completed, the tags and exposure checklist are to be forwarded to the Safety Department.