UFC 4-211-01N
25 October 2004
Including change 1, 1 October 2006
CHAPTER 5
FIRE PROTECTION
5-1
GENERAL. Design fire protection, including water supplies, in
accordance with UFC-3-600-01, Design: Fire Protection Engineering For
Facilities and
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\ NAVFAC ITG FY05-01, Design Criteria for Fire Protection of
Navy and Marine Corps Hangars. /1/
5-2
FIRE SUPPRESSION SYSTEM. The fire suppression system for
all aircraft maintenance hangars containing fueled aircraft, as defined by NFPA
409, must consist of an overhead wet pipe sprinkler system with 79C (175F)
temperature, quick response sprinklers, and a low-level AFFF system designed
in accordance with
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\ ITG FY05-01. /1/ The overhead system must be closed
head, water only sprinklers. A pre-action system can be used where the
sprinkler pipes are subject to freezing. The system must activate automatically.
The low-level system must consist of a system of nozzles located in the floor
trench drains. Activation of the low-level system must be manual and automatic.
Actuation of a manual releasing station or optical detector must release the low-
level AFFF system.
5-3
accordance with NFPA 409. Floor drains in aircraft storage and service areas
must be trench-type drains designed with sufficient capacity to prevent buildup of
flammable/combustible liquids and water over the drain inlet when all fire
protection systems and hose streams are discharging at the design rate.
Maximum trench spacing is 15 m (50 ft) on center. The structural engineer must
coordinate with the fire protection engineer; confirm the size of the piping that will
be used and design the trench to accommodate. In addition, the trench drains
should have sufficient room to accommodate mounting the floor-level AFFF
solution system piping and nozzles where provided. Floor drains should be in
accordance with appropriate facility plates (Figures 3-1 through 3-17); typical
trench configurations are shown in Figures 5-1, 5-2, 5-3, 5-4 and 5-5.
5-4
DRAFT CURTAINS. Provide non-combustible draft curtains to
separate the hangar bay roof area into individual sections not exceeding 690 m2
(7,500 ft2) in area. Draft curtains should be constructed and installed in
accordance with NFPA 409 and
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\ ITG FY05-01. /1/
5-5
O1/O2 LEVEL SPACES. Provide automatic, wet-pipe sprinkler
system.
5-6
FIRE ALARM SYSTEMS. Provide manual and automatic building
fire alarm system reporting to the base-wide system.
5-6.1
Hangar Bay Flame Detection. Provide triple-IR optical flame
detectors in the Aircraft Hangar Bays.
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