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 TM 55-1905-223-10
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 observe these precautions could result in death
or serious injury.
(4) Testing Prior to Re-entering Paint Locker. Prior to re-entry into the Paint Locker, 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 paint locker is located on the aft, exterior bulkhead of the paint
locker, frame 13. 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 observe these precautions could result in death
or serious injury.
(5) Testing Prior to Re-entering, A/C and Emergency Generator Room. Prior to re-entry into
the A/C and emergency generator 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 A/C
and emergency generator room transverse bulkhead, Frame 46. Testing for levels of HF
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Change 10
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