2020 Tech Report Jan-Feb

Task # 3.c.: Returning an Alternate Control Group Configuration to Service

ACTION

COMMENT

3.

Prepare a proper plan to return the equip- ment to service.

Prepare a detailed plan, including written iso- lation and pump out procedures. Review the equipment’s corresponding SOP. Items to include: Valve numbers, Lockout / Ta- gout isolation points, special test pressure re- quirements, order of isolation, etc. Identify and verify locations for purging / vent- ing, attachment of pump down hoses, pres- sure gauges, etc. Check the manufacturer’s Operation and Maintenance Manuals for information or spe- cial instructions to be followed for isolation, testing and evacuation where applicable. NOTE: When performing this procedure, the prevention of hydrostatic lock is of extreme im- portance. The Refrigeration Operator / Tech- nician in charge of this procedure must field verify piping to ensure shutdown will not cre- ate safety or operational issues.

4.

Field verify the isolation procedures and isolation points for affected piping or sys- tems. Ensure shutdown will not affect other equipment in the system before continuing. Confirm that the following valves are closed, tagged, and locked out: Upstream Hand Valve Downstream Hand Valve If automatic valves are located within the section of the Ammonia Refrigeration System being worked on, change the au- tomatic valve(s)’s manual operating stem to the “MANUAL OPEN” operating posi- tion for any automatic valve in the isolat- ed piping. Close or confirm the purge / drain valve within the section of the Ammonia Refrig- eration System being worked is closed and plugged.

5.

6.

7.

RETA TECHNICAL REPORT PAGE 24