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Page Title: OPERATING PROCEDURES. - continued
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TM 10-3835-231-13 2-6.  OPERATING PROCEDURES.  - continued v. Depressurizing and Draining System.  After the TPT is commissioned and placed in operation it will be necessary from time to time to depressurize and drain various parts of the system for maintenance or disassembly.  Throughout the operating and maintenance instructions of the manual, the reader is warned to depressurize the system before breaking (opening)  flanges,  couplings,  and  other  closures.    This  is  to  avoid  spills  or  sprays  of  fuel  that  can  injure  personnel  or cause a fire hazard.  The following describes procedures recommended for depressurization and draining. WARNING PRESSURIZED SYSTEM Do   not   break   (open)   any   flanges   or   open   any   couplings   until   the   system   is depressurized at that location.  Injury can result. (1) A system is generally depressurized by opening the valves in the line of flow leading to a fabric collapsible tank.  The valves upstream of the section to be depressurized are left closed. (2) Individual pieces of equipment such as the strainer in the meter skid assembly, the filter separators, and the hose line pumps have individual vents and drains.  After the system has been depressurized, or that piece of  equipment  blocked  in,  the  vents  and  drains  on  the  equipment  should  be  opened  before  that  particular item is worked on.  This will assure depressurizing of the particular item. (3) The  fuel  dispensing  assembly  or  the  optional  tanker-truck  unloading  system   can   be   depressurized   by opening the valves in the flow path to the tanker-truck after the associated pump has been shut down and blocked in. (4) Close  valves  in  the  applicable  flow  line  that  is  furthest  upstream  (closest  to  the  source  of  fuel  under pressure) be closed first and sequentially followed by the closing of the valves downstream.  This will avoid the  block  in  of  fuel  under  pressure  and  thus  enhance  the  safety  of  the  system.    A  line  closed  off  in  this manner will be depressurized. (5) When a system, or a portion of a system, must be drained for maintenance, it must be depressurized first. Obtain appropriate containers to hold the drained fuel for disposal.  The Closure at the lowest point should be opened first and the hose drained into the container(s).  A closure at the highest point should be opened to allow complete drainage. 2-66

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