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|  MIL-T-21578A
3.4.3.1,4
Reservoir evacuation - When required to maintain
pressures less than atmospheric, the reservoir shall withstand a pressure of
l/2-inch of mercury absolute, without permanent distortion or leakage, A
suitable valve shall be provided below the flame arrestor to permit evacuation.
Reservoir drain lines - Reservoir drain lines shall
3.4.3.1.5
be at least: 1 inch ID for reservoirs up to 100 gallons capacity, 1-1/2 inch I D
for reservoirs between 100 and 150 gallons,. and 2 inch ID for reservoirs over
150 gallons capacity. Drain lines shall terminate with a standard pipe-coupling
flush with the rear of the stand, extending a minimum of 8 inches above the floor,
and shall be sealed with a pipe plug for protection during shipment.
3.4.3.1.6
Vents - All reservoir vents shall terminate at the
top of the test equipment with a female pipe coupling provided for connection
to the facility common venting system, Vent lines shall be a minimum of 1 inch
ID. Vent lines shall be sealed with a pipe plug for protection during shipment,
Provisions shall be made to maintain a positive pressure of not more than 2 inches
of water in the reservoirs of test equipment using any volatile fluid.
Pressurized filling - A l-inch fill pipe provided with a
3.4.3.1.7
shut-off valve shall be connected to the reservoir and extended to the outside rear
of each unit of test equipment, for connection to the pressurized filling system.
A valve shall be located close to the liquid-level gage to permit the operator to
observe the gage during the filling operation, The pressurized filI-valve and
liquid-level gage may be located at the rear or end of the stand. Pressurized
filling shall be required only for reservoirs designed to utilize test fluids with
a flash point below 170 F.
Line termination - All drain lines, fill lines (except
3,4.3.1.8
manual fill line), heating, and cooling lines shall terminate flush at the outside
rear of the cabinet and shall be provided with standard female couplings. Drain
lines shall be provided with a shut-off valve located inside the cabinet. All lines
shall be sealed with a pipe plug for protection during shipment.
Location of service connections - Service couplings
3.4.3.1.9
shall be located in horizontal or diagonal relative positions with a minimum of
6 inches between each coupling to facilitate any interconnection to the facilities
services.
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