MIL-HDBK-1027/1B
used for power and control wiring. Spare conduits for the
device contractor's use are identified under the respective
trainer's requirement.
2.3
Supporting Facilities. Firefighting facilities should
have a utilities building and a bulk storage building with an
agent bottle refill.
2.3.1
Utilities Building. The utilities building design
should conform to the following criteria:
a) The utilities building should have a minimum floor
area of 232 sq. m.
b) The utilities building should include water pumps,
foam concentrate mixing station, motor control centers,
wastewater treatment monitoring equipment, central utility
annunciator panel, and a maintenance area.
c) Provide a minimum of two pumps piped in parallel
to supply 965 kPa water to the farthest hose. For submarine
trainers, provide one full-sized pump for standby when existing
potable water pressure is sufficient; when potable water
pressure is low, provide two full-sized booster pumps in
parallel. Design the pumping system as an industrial process
system and not to meet normal fire protection requirements.
Provide a flow sensor to turn on the second pump, based on
demand. The second pump should be protected from short cycling
with a timer which keeps the pump running for at least 10
minutes, regardless of demand. Each pump should be rated for
continuous duty and should include a non-slam check valve. The
design of the water system should be such that the pumps are
protected from "dead head" during erratic demand variations
experienced at a firefighting training facility. The method of
relieving "dead head" pressure should ensure that the pump
cannot overheat during this condition. The pressure relief
should be by diaphragm relief valve. Provide a manual lead pump
select switch and the lead pump should be started manually.
Process water piping serving the hose stations should be painted
red. Provide pumps with mechanical seals.
d) Aqueous film-forming foam (AFFF) are concentrates,
based on fluorinated surfactants plus foam stabilizers, usually
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