MIL-STD-1518E
5. DETAILED REQUIREMENTS
5.1 Fuel equipment.
5.1.1 Storage and handling system. Each type and grade of product shall be received, stored, and issued in a segregated system. Defueled/reclaimed product that meets the definition of paragraph
3.6.6 shall be placed in its own segregated system. (EXCEPTION, if the defueled/reclaimed product meets the specification requirements of a specific grade of fuel then it may be returned to that storage system with the approval of the appropriate Government representative.) Systems and components used for receiving, storing and refueling aircraft shall be approved commercial systems designed specifically for aviation fuel use. Fuel system design guidance and restrictions on use of certain metals for components
exposed to the fuel are detailed in ATA SPEC 103 and NFPA 407. Metals such as zinc and copper are
limited primarily to protect the thermal stability property of fuel.
5.1.2 Receipt strainers. Strainers with various size openings are used as required in United
Facilities Criteria (UFC) 3-460-03. Clean and inspect fixed equipment strainers in accordance with UFC
3-460-03 and TO 428-1-1.
5.1.3 Receipt filtration. Where fuel is received directly from the supplier by pipeline, tanker/barge, or tanker, fuel must be filtered.
5.1.4 Storage tanks. Storage tanks shall be inspected and cleaned in accordance with UFC 3-
460-03 and T.O. 37-1-1.
5.1.5 Refueling truck product tank. The refueling truck product tank shall be constructed in accordance with SAE ARP5818.
5.1.6 Filtration. Aviation fuel must pass through two separate filter separator vessels downstream of storage. In the event a system is used that has operating tanks (hydrant system) then at least one filtration must be downstream of operating tanks (TO 428-1-1). A filter separator shall be provided on the fueling equipment that connects to the aircraft. (The intent is that the final filtration should be as close to the point of entering the aircraft as possible.) The filters shall meet the performance requirements of EI 1581 or MIL-PRF-52308. Filtration equipment shall be rated equal to or greater than the pumping capacity of the system. Filtration equipment shall be designed so that bypass is not
possible.
5.1.6.1 Fuel Absorption Filters/Monitors Fuel absorption filters/monitors (EI 1583) shall never be used with fuels containing anti-icing additives such as FSII, PRIST and Di-Egme. This includes pre-mixed and military fuels containing these additives. The use of monitor cartridges with fuels containing anti-icing additives may result in a failure of the monitor cartridge and/or migration of filtration media into the fuel stream, either of which could potentially cause damage to or sudden failure of the corresponding engine(s).
5.1.6.2 Filtration element replacement. Replacement of elements in filtration equipment is required as follows:
a. In accordance with manufacturer's requirement, not to exceed in service time requirements of TO 37-1-1 and UFC 3-460-03. Date of filter element change shall be stenciled on the filter housing or imprinted on a metal tag permanently attached to the housing. (Note, it is recommended to change filtration elements on a 12 month cycle)
b. When differential pressure reaches the maximum recommended by the element manufacturer or 15 psi, whichever is lower.
c. When solids and/or water test on samples taken downstream of the filter fail.
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