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Page Title: Fuel Transfers - Cont'd
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4-16  Fuel Transfers- Cont'd. 1. Open valves V6J, V71, VI J, V121, V14J, V18J, V321, V31) and V21J. 2. Although the drawings and the P&ID in this manual show one possible hook-up, numerous combinations can be made, depending on hoseline availability and the service required. 4-17  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. 4-17.1    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, of course, left dosed.  For example; (referring to P&ID Fig. 2-1) if it is necessary to depressurize the hose system leading from the switching manifold to tank T1I in the secondary module of the jet fuel unit to work on or replace valve V2D, the procedure is to leave the following valves closed: VJ, VI51, V116, V81, V 19J.  The following valves are opened: V2J, V31, V4J, V5J.  The system will then depressurize into tank T1J. 4-17.2   Individual pieces of equipment such as the strainer in the meter strainer 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. 4-17.3   The fuel dispensing assembly or the optional tanker-truck unloading system can be depressurized by opening the valves in the flow path to the vehicle after the associated pump has been shut down an blocked in. 4-17.4   As a standard practice it is recommended that when a fuel transfer has been completed that the valve 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. 4-17.5   When a system, or a portion of a system, must be drained for maintenance the system must be depressurized first.    Arrangements  should  be  made  for  containers  to  hold  the  drained  fuel  for  subsequent  disposal.    The  closure(s) (flanges or couplings) at the lowest point(s) should then be opened first and the hose drained into the container(s).  A closure at the highest point should then be opened to allow complete drainage. SECTION IV - OPERATIONS UNDER UNUSUAL CONDITIONS 4-18  General Operating under severe environmental conditions such as unusually cold weather, unusually hot weather, or in blowing sand and dust requires special precautions.  These precautions are outlined below. 4-46

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