2.14.7
Flexible Pipe Connections
Connection shall be a stainless steel, single-braided, close helical type
hose with ANSI Class 150 end connections. Connection shall have sufficient
length to absorb 3.20 mm 0.125 inch lateral movement. Hose shall have a
minimum working pressure of 1896 kPa (gage) at 38 degrees C 275 psig at 100
degrees F.
2.14.8
Temporary Conical Strainers
Provide steel pipe spool piece 300 mm 12 inches long with ANSI Class 150
welding neck flanges on each end of the spool piece, and of the same
diameter as the ANSI Class 150 flanges on the connecting piping. Strainers
shall be designed to be installed between flanges, with strainer body
within the spool piece. Strainer shall be constructed of stainless steel
with 6.35 mm 0.25 inch diameter holes, and lined with 60-mesh stainless
steel wire screen.
2.15
EQUIPMENT
Design pressure components of equipment for minimum working pressure of
ANSI Class 150. Metal contacting the fuel in aviation fuel systems shall
be stainless steel Types 304 or 316, or aluminum alloys 3003, 6061-T6, or
356-T6, except as modified in paragraph entitled "Special Requirements," in
this section.
2.15.1
Filter Separator Units
[MIL-F-27630 for up to 38 liters per second 600 gpm capacity] [and] [
MIL-F-83402 for up to 76 liters per second 1200 gpmcapacity], except as
modified herein. Unit shall be horizontal or vertical type as indicated.
Design units for use with fuels conforming to MIL-DTL-5624 and MIL-DTL-38219.
Filter water separator elements shall conform to MIL-PRF-52308. Provide
piston type direct-reading pressure differential gage wherein the piston
moves downward in a glass cylinder along a zero to 200 kPa 30 psi graduated
scale; permanent set of the spring (loss of calibration) must be clearly
visible by the position of the piston when there is no differential
pressure. Provide one complete set of elements for each unit. Furnish one
complete spare set of coalescer elements for each unit. Automatic water
sump drain valve may be copper alloy.
2.15.2
Fuel Quality Monitors
MIL-PRF-81380D, except as modified herein. Stainless steel Type 304 or 316
or aluminum alloys 3003 or 6061 fabricated housing with flanged inlet and
outlet, two gage taps, an air release tap complete with automatic air
eliminator, and a 20 mm 0.75 inch drain valve. The fuel quality monitor
elements shall also conform to MIL-PRF-81380D for test procedures and
performance requirements, except elements shall be of the slow-closing,
water-absorbing type. Provide piston type direct-reading pressure
differential gage wherein the piston moves downward in a glass cylinder
along a zero to 207 kPa 30 psi graduated scale; permanent set of the spring
must be clearly visible by the position of the piston when there is no
differential pressure. Provide one complete set of elements for each unit
and a calibrated tag showing differential pressure versus fuel flow for
clean and dirty elements. Furnish one complete spare set of elements for
each unit.
SECTION 15194N
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