MIL-HDBK-1027/1B
(1)
Waterbath vaporizers should be FM approved.
(2) Waterbath vaporizers should be located to
maintain the space clearances as required by FM.
(3) Provide emergency shutoff valves with fusible
links. Provide the following emergency shutoff valves in
accordance with NFPA 58 and FM Loss Prevention Data:
(a) Liquid propane supply from the truck
unloading station to the storage tank.
(b)
Liquid propane supply from the storage
tank to the vaporizer.
(c) Gas propane supply from the vaporizer.
Regardless of which type of propane vaporizer is used, the truck
unloading station should be located 23 m minimum from the tank
and vaporizer. Refer to Appendix J, Figure J-1.
t) Indirect-fired vaporizers can be located indoors
in specially designed vaporizer rooms. Refer to NFPA 58 for
requirements. If a vaporizer room is provided then provide a
separate propane alarm detection system for the room. This
alarm detection system should provide an alarm (sound and
flashing warning sign) in the instructor's station at the
24-hour duty desk, and locally at the vaporizer room entrance.
Provide a 24-hour battery backup.
In addition to the alarm detection system, for propane
vaporizers installed indoors, provide the following safety
features:
(1) The exhaust fan should be located near the
floor and should vent to the outside with high and low intakes
in the door. The exhaust fan should be energized by an on-off
switch located outside of the room.
(2)
Doors with panic hardware.
(3)
A leak detector readout with the readout
outside.
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