MIL-HDBK-1022A
10.2.5.6
Controls.
Provide the following controls.
a) Use pumps and/or compressors that can be started
and stopped by manual pushbutton.
b) Provide automatic limit switches as follows:
(1) Pressure switches on storage tanks set 5 psig
(35 kPa) below relief valve settings.
(2) Liquid level switches on storage tanks set at
maximum filling levels.
(3) Liquid level switches on knock-out drums set
to shut off compressor at high liquid levels.
(4) High pressure switches in compressor
discharges to shut off compressor at safe pressure levels.
c) Provide manually operated throttle valves in
liquid off-loading lines to adjust flow rates below excess
flow valve settings on delivery tanks.
d) Provide a sight flow indicator in liquid lines
near throttle valves.
e) Provide automatic temperature, pressure, and
limit controls on vaporizers in accordance with NFPA 58.
10.2.6
Air Mixing Facilities
10.2.6.1 Pressure Controls. Provide pressure control valves
in both air and gas lines to air mixing equipment. Provide a
low pressure alarm in both lines to shut-off air and gas in
the event of low pressure.
10.2.6.2 Volumetric Controls. Provide volumetric controls at
all distribution facilities as follows:
a) Provide displacement-type or flow-type meters in
both air and gas lines to maintain a proportional flow of air
and gas.
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