2020 Tech Report Jan-Feb

Task # 2.c.: Cleaning a Strainer in an Alternate Control Group Configuration: No Drain Valves

ACTION

COMMENT

NOTE: If a Management of Change (MOC) form has been initiated to permanently add a purge / drain valve (Valve “B”) to the strainer (Strainer “A”), continue. Otherwise, skip to Step 24. It may be necessary to use a bushing or re- ducer.

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Carefully remove the plug from the bot- tom of the strainer.

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Install a ¾” nipple into the outlet of the Strainer “A.” Install Valve “B” Drain Valve into the ¾” nipple extending from the outlet of the strainer. Install a ¾” nipple, 90 Deg. elbow and ad- ditional nipple into the outlet of Valve “B.” Slowly close the purge / drain valve iden- tified in the isolation procedure In some instances, the pump down may be required in multiple locations. Dispose of the water in the bucket. Log “Isolation, Pumpout, and Strainer Cleaning of Control Valve _____” ( in- sert the appropriate valve number ) in the Master Maintenance Log (or facility equivalent). Repeat this Maintenance Procedure for each strainer to be cleaned, starting with Task # 1 “Preparing for Refrigeration Sys- tem Strainer Cleaning.” If this is the last strainer to be cleaned, cleanup the work area, and secure all equipment.

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Refer to the equipment’s SOP and/or refrig- eration system P&ID’s. Repeat this procedure for each section. NOTE: Water containing ammonia drained from an Ammonia Refrigeration System may be considered hazardous. If you have any questions, consult your supervisor or facility contact on how to properly dispose of the wa- ter. NOTE: Log entries must contain the name of the person making the entry, as well as the time, date, and pertinent details. Be specific! If there is not an established Master Mainte- nance Log (or facility equivalent), log the infor- mation on your work order. See Task # 1 of this Maintenance Procedure.

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RETA TECHNICAL REPORT PAGE 17