MIL-HDBK-1027/1B
diluted with water to a 3 to 6 percent solution. The foam
formed acts both as a barrier to exclude air or oxygen, and to
develop an aqueous film on the fuel surface capable of
suppressing the evolution of fuel vapors. The foam produced
with AFFF concentrate is dry chemical compatible and thus is
suitable for combined use with dry chemicals. At firefighting
training facilities, an AFFF surrogate is used in lieu of real
AFFF for cost and environmental reasons. The foam surrogate
concentrate, Calsoft, Ultrawet K, or equivalent, will be
delivered and stored in bulk form. Refer to par. 4.2 for
details on AFFF. It will be pumped to the utilities building
concentrate mixing tank where it will be diluted with potable
water to a strength equal to 100 percent AFFF concentrate. A
batch process should be used and provisions for mixing should be
included to prepare the solution. The method chosen for mixing
should consider the potential foaming problem. The 100-percent
solution will be pumped as required to each proportioner holding
tank on the fire field. It will also be used to fill 19 L foam
concentrate cans for use in the training structures. Carbon
steel cannot be used for piping and storage of AFFF surrogates.
Acceptable materials are stainless steel and copper piping.
AFFF concentrate piping tanks and appurtenances should be
painted green. All 6 percent and 3 percent AFFF piping should
be painted green and red striped. AFFF pumps should be positive
displacement type with internal relief and mechanical seals.
e) An electrical room should be provided in the
utilities building to house electric controls and utilities
related motor control centers, such as, water, fuel, chemicals,
waste pumps, and others.
f) Utility system information, such as pressures,
temperatures, liquid levels, run status, and flows should be
brought to a central annunciator panel. The fuel information
should be sensed indirectly so that no fuel is piped inside the
building. Tanks and reservoirs should have level indicator
devices.
2.3.2
Storage and Refill. Storage and refill facilities
should meet the following criteria:
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