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 TM 55-1905-223-10
on LCU-2K consists of five (5) manually actuated systems.
a. Engine Room. This manually actuated system is designed and installed to protect the Engine
Room and bilge (3-25-0-E), Frames 25 to 44. The physical location of this system, less
FM-200 distribution piping and nozzles, Electric Horn/Strobe and Warning Lights (Amber
Strobe), is installed outside of the protected space. Two (2) each 600 pound cylinders and
supporting components, installed on the forward bulkhead, Frame 42 , A/C and Emergency
Generator Room (1-43-0-E), provide protection for the Engine Room and bilge. One (1) each
350 pound cylinder and supporting components, installed on the 7'0" off centerline longitudinal
bulkhead, Starboard side, Frames 23 to 24, Tunnel (3-17-0-Q), provide protection for the
Forward Engine Room (MCC/Storeroom/Machine shop areas) and bilges.
b. Tunnel. This manually actuated system is designed and installed to protect the Tunnel and
bilge (3-17-0-Q), Frame 17 to 25. The physical location of this system, less FM-200
distribution piping and nozzles, Electric Horn/Strobe, and Warning Light (Amber Strobe), is
installed outside of the protected space. One (1) each 350 pound FM-200 cylinder and
supporting components, installed on the 7'0" off centerline longitudinal bulkhead, Port side,
Frames 19 to 20, Tunnel (3-17-0-Q), provides protection for Bow Thruster Room and bilge.
c.
Bow Thruster Room. This manually actuated system is designed and installed to protect the
Bow Thruster Room and bilge (3-5-0-E), Frames 5 to 17. The physical location of this system,
less FM-200 distribution piping and nozzles, Electric Horn/Strobe, and Warning Light (Amber
Strobe), is installed outside of the protected space. One (1) each 350 pound FM-200 cylinder
and supporting components, installed on the 7'0" off centerline longitudinal bulkhead, Port side
Frames 19 to 20, Tunnel (3-17-0-Q), provides protection for Bow Thruster Room and bilge.
d. Paint Locker. This manually actuated system is designed and installed to protect the Paint
Locker (1-0-2-Q), Frames 0 to 13. The physical location of this system, less FM-200
distribution piping and nozzle and FM-200 Siren, is installed outside the protected space. One
(1) each 125 pound FM-200 cylinder and supporting components, installed on the 7'0" off
centerline longitudinal bulkhead, Port side, Frame 10, Bow Thruster Room (3-5-0-E), provide
protection for the Paint Locker.
e. A/C and Emergency Generator Room. This manually activated system is designed and
installed to protect the A/C and Emergency Generator Room (1-43-0-E), Frames 42 to 52.
The physical location of this system, less FM-200 distribution piping and nozzles, Electric Horn/
Strobe, and Warning Light (Amber Strobe), is installed outside of the protected space. One (1)
each 125 pound FM-200 cylinder and supporting components, installed in the Stowage Locker
(1-43-1-Q), Frames 43 to 44, provides protection for A/C and Emergency Generator Room.
f.
Related Installations. The Engine Room, Tunnel and Bow Thruster Room FM-200 installations
are supplemented by the installation of a Water Washdown System (WWS). This manually
activated system serves to quickly reduce compartment temperature prior to discharge of FM-
200 agent, minimizes production of Hydrogen Fluoride (HF) Gas generated as a result of FM-
200 agent decomposition from contact with hot surfaces and flame at temperatures above
1300F, aids in scrubbing of any HF Gas generated and expedites ventilation of the
compartment. Operation instructions for the WWS are contained in paragraph 2-47. For
maintenance and installation of the Water Washdown System (WWS) components reference
TM 55-1905-243-24&P.
Change 10
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