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P-015

Maintenance Procedure Non-Standard Oil Draining

Page 13 of 20

2.d. Oil Draining Alternate Configurations Not Listed Previously

STEP/ACTION

COMMENT

9. Install a vented self-closing (spring return) valve in the outlet of drain valve identified in the isolation procedure.

NOTE: It may be beneficial to leave this valve installed at the end of this procedure. A Management of Change Procedure will be required. Alternately, the use of a hose may be necessary.

10. Install a ¾” nipple, 90 deg elbow and additional nipple into the outlet of drain valve identified in the isolation procedure. 11. Isolate the inlet valves as identified in the plan developed above. Look for the flow arrows on the piping. Apply Lockout/Tagout per the Lockout/Tagout Program. 12. If automatic valves are located within the section of the Ammonia Refrigeration System being worked on, change the automatic valve(s)’s manual operating stem to the “MANUAL OPEN” operating position for any automatic valve in the isolated piping. 13. If possible, allow the section of the system / piping with the control valve to pump down by isolating the liquid feed while maintaining the refrigeration suction. 14. Lower the pressure in the isolated section of the piping to the lowest pressure available.

NOTE: If the automatic valve is a motorized valve, a special tool is required to change the position of the valve when it is de energized. Please see the Manufacturer’s Operation and Maintenance procedures for specific requirements. See the Operation and Maintenance Manuals in the PSM / RMP Program.

NOTE: Any frost on exposed portions of the pipe or valves should disappear with the liquid ammonia in the system. NOTE: If the isolated piping is in a vacuum, take precautions to prevent water being drawn in when purging the piping. NOTE: DO NOT ISOLATE SECTIONS OF LIQUID PIPING UNDER PRESSURE. THIS CAN CREATE A HYDROSTATIC LOCK, AND CAN RESULT IN RUPTURED PIPING AND A RELEASE OF AMMONIA!

15. Isolate the outlet valves, as identified in the plan above, of the section of the Ammonia Refrigeration System being worked on. Apply Lockout / Tagout per the Lockout / Tagout Program. 16. Place the oil recovery container below the outlet of drain valve identified in the isolation procedure.

Revision 1, November 1, 2023

This Copy Printed: November 1, 2023

MP-015 Non-Standard Oil Draining.doc Last Reviewed: October 30, 2023