MIL-HDBK-1027/1B
2.2
Utility Design
2.2.1
General
2.2.1.1
Service. The various services, water, fuel, 100
percent foam (surrogate) concentrate, and, possibly, compressed
air should be routed to each training structure by underground
pipe. Each service should include a manual shutoff valve for
maintenance purposes. The valves to a given structure should be
grouped together in a valve pit with a cover small and light
enough to be lifted by two men. No cover should weigh more than
57 kg and each cover should have lifting handles. The propane
valve should be in a separate pit.
2.2.1.2
Design for Simultaneous Operation. Design and size
utilities for the firefighting training school to allow for
training structures to operate simultaneously.
2.2.1.3
Freeze Protection and Snow. Firefighting facilities
should be protected against freeze damage. Because training
structures are not usually heated, interior and exterior
water-based utilities located aboveground should be protected.
Large valve pits with many valves should also include protection
for freezable utilities. Refer also to pars. 3.2.3 and 3.11.8
for additional requirements. Methods of freeze protection
include drain-down, heat tracing, and air purge. The following
criteria applies to this handbook:
a) When a drain-down system employs some method of
automatically sensing ambient temperature and controlling a
valve, install a manual valve in parallel with the automatic
valve. The manual valve will provide an added measure of
protection.
b) Provide freeze protection at any location where
there is the possibility of freezing temperatures. Sites as far
south as Mayport, Florida, should have freeze protection.
c) In those locations subjected to regular snow
accumulations, ensure that the design will not impede the
operation of exterior equipment. Design facilities to
accommodate snow removal procedures.
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