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 TM 55-1905-223-10
MSDS
LOCATION
Hydrogen Fluoride (HF) Gas
TM 55-1905-243-24&P
FM-200
TM 55-1905-243-24&P
TM 55-1905-243-24&P
Carbon Dioxide (CO) Gas
TM 55-1905-243-24&P
(5) Combating HF Gas. In order to combat HF Gas, the below main deck machinery
spaces (engine room, tunnel and bow thruster room) have been fitted with individual
Water Washdown Systems (WWS). Reference paragraph 2-64 for WWS operation
The design and maintenance requirements for the WWS are contained in
TM 55-1905-243-24&P. The purpose of the WWS is to:
- Quickly reduce temperature in the protected space.
- Minimize production of HF Gas generated as a result of FM-200 agent
decomposition from contact with hot surfaces and flame at temperatures above
1300F.
- Aid in scrubbing of any HF Gas generated.
- Expedite ventilation of the protected space.
(6) Oxygen Breathing Apparatus (OBA) and Fire Fighting Equipment. HF Gas damages
aluminum, kevlar and metal components. OBA and Fire Fighting Equipment, when
exposed to HF Gas, shall be taken out of service until affected components are
replaced.
h. Post Fire Re-Entry.
Authorization to re-enter the engine room, tunnel, bow thruster room, paint locker or A/C and
emergency generator room, after discharge of the FM-200 fixed fire extinguishing system and
WWS, shall be issued by the person in charge at the scene.
i.
Re-Entry Testing Requirements.
WARNING
Dependent upon the temperature of the fire within the protected
space prior to extinguishment, the protected space may contain
a level of HF Gas which is dangerous to humans. Testing to verify
that the level of HF Gas is safe for re-entry must be performed and
followed to the full extent of the re-entry testing procedures for HF
Gas contained in manufacturer's operation and maintenance
instructions. The protected space shall not be entered unprotected
when the level of HF Gas has a threshold limit value (TLV) of three
(3) parts per million (PPM) or greater.
If HF Gas reading is above 3 PPM, continue to operate the water
washdown system and follow testing procedures until level is safe
for re-entry. For those spaces without an installed water washdown
system, the natural decay (drop out) rate for HF gas is approximately
15 minutes after the fire is extinguished. Failure to follow these
procedures could result in death or serious injury.
(1) Testing Prior To Re-Entering Engine Room. Prior to re-entry into the Engine Room, after
discharge of the FM-200 fixed fire extinguishing system, the protected space shall be
tested for levels of HF gas. An HF Gas Sampling Port has been installed to facilitate
testing. The HF Gas Sampling Port for the Engine Room is located in the
2-736
Change 10
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