MIL-HDBK-1022
Section 9:
PIPING SYSTEMS
9.1
INTRODUCTION. This section provides guidance for
the design of the piping portions of fueling systems, as
discussed in other sections of this handbook. The criteria
provided is intended to be general in scope except where
specific criteria is necessary for given situations.
9.1.1
Design Requirements. Ensure that piping design,
materials, fabrication, assembly, erection, inspection, and
pressure tests for fuel piping systems are in accordance with
ANSI/ASME B31.3 and/or ANSI/ASME B31.4, as applicable
according to the application. Follow appropriate guide
specifications for piping design and materials selection. Use
the following design criteria for piping systems:
a) Unless otherwise specified by Service
Headquarters, provide underground piping systems in and around
areas subject to aircraft ground movements. If approved by
Service Headquarters, install piping in concrete trenches.
When trenches are employed, comply with NFPA 415. The use of
common trenches for more than one utility is prohibited.
Fueling equipment may be aboveground where it does not
interfere with aircraft or service vehicle movements. Design
all clearances in accordance with MIL-HDBK-1021/1,
MIL-HDBK-1021/2, and Standard Design AW 78-24-28.
b) In other cases, aboveground piping is preferred
where it is not aesthetically objectionable or not exposed to
accidental damage, vandalism, blast damage, or sabotage.
c) The preferred method of routing aboveground
piping out of a diked area is over the top of the dike.
However, avoid creating an inverted "U" on the suction side of
a pump to avoid an air trap.
d) Hydrostatically test new piping systems in
accordance with API RP 1110. During testing, disconnect
system components such as storage tanks or equipment which
were not designed for the piping test pressure or protect them
against damage by over-pressure. Hydrostatically test systems
to the lesser of 1.5 times the operating pressure or 275 psig
(1900 kPa) maximum. Test hydrant and direct aircraft fueling
systems and installation fuel pipelines with fuel. For all
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