MIL-HDBK-1027/1B
allow for thermal expansion. Weathering steel (ASTM A588/A588M,
Standard Specification for High-Strength Low-Alloy Structural
Steel With 50 psi (345 MPa) Minimum Yield Point to 4 in. (100
mm) Thick or ASTM A242/A242M, Standard Specification for
High-Strength Low-Alloy Structural Steel should not be used
because the rust is not self-limiting in this application.
Steel liners protect the refractory coating from the effects of
the water spray and raise the training compartment temperature
by reflecting the heat back into space.
a) The refractory system should be a one-inch thick
calcium silicate board like "Westtemp" as manufactured by Fire
Facilities, Inc. of Antioch, IL.
3.8.2
Windows. Windows should be provided in training
compartment walls as shown on the floor plans in Appendix B,
Figures B-3 and B-4; Appendix C, Figures C-2 and C-3; Appendix
D, Figures D-1, D-2, and D-3. These windows provide a means for
spectator viewing. Windows should be 139 sq. m be made of heat
strengthened glass, and have hinged, sheet metal covers on the
outside.
3.8.3
Cool Down. Walls adjacent to fireplaces will probably
overheat, so a method to cool them down between training
exercises should be provided. The preferred method is a water
spray system consisting of nozzles and a motorized valve wired
back to the data terminal cabinet, which will have manual
control. The motorized valve should have a manual bypass which
will be used for the trickle cooling flow control. Nozzles
should be located so that water dripping from them will not
detract from the training. These nozzles and their piping will
require an adjustable flow rate of water to maintain a trickle
to protect them from the heat.
The main purpose of the cool-down system is to provide
cooling of the wall and ceiling steel plate liners after a
training scenario. The spray nozzles are controlled by a
solenoid valve via the DTC/device computer. There should also
be manual control by the hand/off/automatic switch. Dripping is
accomplished by a manual bypass globe or needle valve. This
valve bypasses the solenoid. The spray nozzle should be open
type, stainless steel (316 SS) with 125 degree spray pattern,
10 mm orifice. Install cooling nozzle in pendant position.
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