CO0053658 (2) - Laserfiche WebLink

Home Browse Search

WLineage- Stockton Maintenance Procedures Task flow diagram for this maintenance procedure is presented below: 1. Notify Affected Personnel 2. Set the Valve to The Back-Seat Position 3. Remove and Replace the Packing Seal 4. Packing Seal Leak Inspection 5. Clean Up and Notification Task Step Comment 1.1 Notify all affected personnel of the procedure being conducted. 1. Notify Affected 1.2 Ensure all essential materials,tools and PPE are Personnel available and in place prior to commencing work 2. Set the Valve To The 2.1 Don PPE Listed above p g This separates the O-ring and packing 2.2 Open the valve stem firmly to the back-seat Back-Seat Position from the system refrigerant. position 3.1. Remove the packing nut carefully and then use Take care not to scratch the stem or a wire hook or a small blade screwdriver to bonnet sealing surfaces. remove the packing and 0-ring. 3. Remove and Replace The 3.2. Carefully install the backup washer(1%"-18"or Packing Seal 13mm,450mm only),new lubricated stem 0- ring,stem washer,and stem packing. Tighten the packing nut only enough to 3.3. Tighten the packing nut only enough to give the give the handwheel slight turning handwheel slight turning friction friction. 4.1 Slowly start turn the valve off the back-seated (fully open)position to subject the gland seal to Seals should be inspected for leakage 4. Packing Seal Leak refrigerant pressure. after replacing. Inspection 4.2 With a sulfur stick,verify that no leaks are It may be required to re-tighten the present,and the new packing is sealing packing nut if leaks exist. properly. 5. Clean Up and Notification 5.1 Notify all affected personnel that the procedure has been completed. Document#: Valve Packing Seal Replacement Procedure Page 3 of 4 Revision#: 1.0. Revision date: 04/26/2021