GENERAL INFORMATION FOR WATERWASHDOWN SYSTEM (WWS)

TM 55-1905-243-24&P

1.11 FM-200 OPERATION INSTRUCTIONS. Operation instructions for each protected space are located in TM

55-1925-223-10, paragraph 2-63.

GENERAL INFORMATION FOR WATERWASHDOWN SYSTEM (WWS)

2.1 DESCRIPTION OF WWS. The WWS built of all stainless components are three (3) separate systems

installed in the Engine Room, Tunnel, and Bow Thruster Room. The WWS is a hydrogen fluoride (HF) gas

mitigation, water washdown system (WWS) which provides general overhead coverage to the protected spaces.

The WWS is a simple overhead sprinkler grid which is piped directly to the existing firemain. It receives seawater

from the Bow Thruster Emergency Fire Pump (Engine Room WWS) and two Engine Room Fire Pumps (Bow

Thruster Room and Tunnel WWS). The Bow Thruster Emergency Fire Pump is powered by the Bow Thruster

diesel engine and the two Engine Room Fire Pumps are powered electrically from the Ships Service Switchboard

240 V Distribution Panel.

2.2

PURPOSE OF WWS. The WWS, upon activation, serves to quickly reduce the temperature within the

protected space, minimize production of Hydrogen Fluoride (HF) Gas which is produced as a result of FM-200

agent decomposition in contact with hot surfaces and flame at temperatures above 1300o F, aid in scrubbing of any

HF Gas generated and expedite ventilation of the protected space.

WARNING

THE WWS IS NOT DESIGNED NOR INTENDED TO BE A STAND ALONE FIRE

EXTINGUISHING SYSTEM. IT IS DESIGNED TO BE USED IN CONJUNCTION

WITH THE INSTALLED FM-200 FIXED FIRE EXTINGUISHING SYSTEM.

FAILURE TO DO SO COULD RESULT IN EQUIPMENT DAMAGE,

DEATH OR SERIOUS INJURY.

2.3 INSTALLATION. Each WWS has been installed in accordance with the approved Technical Data Package

(TDP) which consists of the Detailed Design/Installation Drawings.

2.4 VESSEL SPECIFIC DESIGN CONFIGURATIONS. Due to the differences in vessel configuration within the

LCU-2000 Design, minor configuration changes to the Detailed Design/Installation Drawings were made during

each installation to accommodate the configuration of each vessel. The Detailed Design/Installation Drawings

have been revised to fully disclose the configuration of each WWS installed on your vessel. Drawings LCU-2000-

5231-1, US Army LCU-2000 Water Washdown System Piping Installation and Details and LCU-2000-5231-2, US

Army LCU-2034 Water Washdown System Label Plates and Placards, which are specific to your vessel, disclose

the LCU-2K class configuration of each WWS. Drawing LCU-2000-5231-1 and drawing LCU-2000-5231-2 are

provided at Appendix E.

2.5 OPERATION INSTRUCTIONS FOR WWS. Operation instructions for the WWS are contained in TM 55-

1925-223-10, paragraph 2-64.