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TM 10-3835-231-13
4-8. SWITCHING MANIFOLD ASSEMBLY.
The switching manifold (figure 4-7) controls the flow of fuel into the fuel units or the contaminated fuel module from the
pipeline. Fuel may be directed into any of the three fuel units within the TPT. Fuel cannot be transferred from a fuel unit
to the contaminated fuel module or to a tanker-truck receipt manifold. A single switching manifold may connect two or
more TPT's under some conditions. In the case of systems involving the installation of multiple TPT's, fuel can be
transferred from one TPT to another TPT through the pipeline and switching manifold. Ideally, the switching manifold
should be as compact as possible.
a.
Position containers containing 6-inch aluminum tees, 6-inch gate valves, 6-inch sampling assembly, 6-inch
ball valves, hose assemblies, meter skid assemblies, and pressure regulating valve assembly near their
respective installation sites as indicated.
b.
Remove tees, valves, hoseline, pressure regulating valve assembly, sampling assembly, meter skid
assemblies, adapters, coupling clamps, and coupling gaskets from containers.
c.
Inspect all items for damage, cleanliness, and quantities required.
NOTE
Liberally apply petrolatum to the gasket and the inside surface of coupling clamp to
prevent pinching during installation. Then, pull the coupling gasket over one
grooved end of each mating joint. Ensure gasket is properly positioned over full
circumference of sealing surfaces. Position coupling clamp over gasket. While
maintaining alignment of mating parts, lock coupling clamp securely.
d.
Connect 6-inch tees (2) together to form the configuration shown using coupling clamps (1).
e.
Connect gate valves (3) and ball valve assemblies (4) to tees (2) using coupling clamps (1).
f.
Connect discharge hoses (5) between ball valves (4) and meter strainer assemblies (6). Also, between the
tee (2) and meter strainer on the return manifold using coupling clamps (1).
g.
Connect fuel sampling assembly (7) to tee (2) using coupling clamps (1). In some cases hose may be in
between the sampling assembly and the switching manifold.
h.
Install pressure regulating valve assembly (8) in the pipeline using coupling clamps (1) to the switching
manifold, upstream of the fuel sampling assembly or as directed by the operating authority. Six-inch IPDS
single groove pipe is supplied by the associated pipeline. If the system does not involve an associated
pipeline, the feed line (hose or pipe) can be tied directly into the pressure regulator (8) and all downstream
conduit can be hoseline.
4-21
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