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 TM 55-1905-223-10
Water Washdown Control Station, Main Deck Starboard Passageway (1-33-0-L), Frame
41. Testing for levels of HF gas shall be accomplished using the sampling pump which has
been issued at the time of FM-200 system installations. Maintenance instructions for the
sampling pump are contained in TM 55-1905-243-24&P. A minimum of three (3) samples
at two (2) minute intervals shall be taken.
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.
(2) Testing Prior to Re-Entering Tunnel. Prior to re-entry into the tunnel, 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 tunnel is located in the Water Washdown Control Station, Engine Room (0-25-0-E),
watertight bulkhead 25. Testing for levels of HF gas shall be accomplished using the sampling
pump which has been issued at the time of FM-200 system installations. Reference
maintenance instructions in TM 55-1905-243-24&P, Detector Tubes and Kwik-Draw Pumps.
A minimum of three (3) samples at two (2) minute intervals shall be taken.
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 observe these precautions could result
in death or serious injury.
(3) Testing Prior to Re-Entering Bow Thruster Room. Prior to re-entry into the Bow Thruster
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 Bow Thruster Room is located in the Water
Washdown Control Station, Tunnel (3-17-0-Q), Starboard side, watertight bulkhead 17.
Testing for levels of HF gas shall be accomplished using the Sampling Pump which has been
Change 10
2-737
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