MIL-HDBK-1027/1B
a) The design ventilation for the 21C12 and 21C12A
should be based on the simultaneous operation of all three
fireplaces or 34 456 L/s "air out."
b) The training compartment should have a 330.2 mm
diameter ventilation duct which should be used for training
purposes. This duct should run above the main walkway and
terminate with a cap above the ceiling in staging area 1. The
other end should lead to the fan room above staging area 2.
There should be a bulkhead flapper at both staging area wall
penetrations. A 200 mm branch leading to the fire area should
be fitted with a 200 mm female blower adapter to allow the
trainees to connect a Red Devil blower. The blower should be
used to aid in evacuating smoke from the space during the
training exercise. Bulkhead flappers and blower adapter should
be provided by the device contractor. The horizontal run and
the elbow in staging area 2 should have access panels for
cleanout. Device contractor should provide the Red Devil blower
and adapter.
c) In the fan room, the trainee vent duct should
connect to the main compartment exhaust system through a
motorized damper and a manual damper. During a training
scenario when the trainee secures the mockup compartment
ventilation, the motor damper should close automatically,
stopping the flow of smoke into the branch duct. Note the
actual compartment ventilation should be unaffected. The fan
should run continuously. When the trainee attaches the Red
Devil blower to the branch duct and reactivates the trainer
ventilation, the motor damper should reopen, discharging into
the main exhaust duct.
d) The main ventilation system for the fireplace
compartment should have intakes above the ceiling level at the
bilge and hull fireplaces, above the entrance to the emergency
corridor at the ceiling level at the bilge and hull fireplaces,
above the entrance to the emergency corridor at the ceiling
level, and at the roof level above the emergency corridor door
leading to staging area 2. Each of the intake ducts should have
manual dampers for volume control. The main ventilation system
should be provided with a floating point damper in the main
exhaust duct run serving the fireplace compartment.
74
Previous Page
