MIL-HDBK-1022
feature must not be included on pipeline and barge receipt
lines. In those cases, use a differential pressure alarm and
a differential pressure-actuated bypass valve.)
(4) Only at barge-receiving locations or where
large quantities of water are expected, automatic water drain
valve connected to the bottom of the water sump. Automatic
water drain valves are permitted on API Publ 1581 Class A
applications only.
(5)
Manual water drain valve from the bottom of
the water sump.
(6)
Pressure-relief valve.
(7)
Automatic air release with check valve.
(8) Strainers upstream of filter/separators when
the filter/separator is upstream of operating storage tanks.
(9) Connect automatic water drains, manual
drains, pressure-relief valves, and air releases to a
permanently installed fuel recovery system.
(10) Visual sight gauges (sight flow indicators)
on drain piping and pressure relief valve where there is
closed piping.
(11) Fuel sample points upstream and downstream.
c) Provide a means to slow-fill the vessel. This is
necessary to avoid static buildup during the filling of the
filter/separator. Standard Design AW 78-24-28 gives details
for this design feature.
4.7.6.2
Arrangement. Arrange the system piping so that fuel
from the discharge side of the fueling system transfer pumps
can be recirculated back through the inlet filter/separators
into the operating storage tank. Inlet filter/separators may
serve more than one operating storage tank. In aircraft
direct fueling systems on the downstream side of operating
storage tanks, arrange the piping so that the fuel can be
circulated from the operating storage tanks, through the
filter/separators, to each aircraft fixed fueling station and
back through the inlet filter/separators to the operating
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