CHAPTER 4 SMOKE DETECTOR SYSTEM
Section I. General
4-1 General. The smoke detector system provides a means of detecting smoke in any or all of the barge's eight voids.
When smoke is detected, an alarm sounds to alert crewmembers. Flashing light(s) on the detector panel identifies in
which void or voids the smoke is being generated. Barge firefighting equipment consists of a Halon 1301 system, 2 CO2
hose reel units, 17 portable CO2 and 5 dry-chemical fire extinguishers, 5 self-contained breathing devices, and a portable,
engine-driven firefighting water pump. Details about barge firefighting equipment are in TM 55-1930-204-14&P-17.
4-2 Description. The smoke detector system has a cabinet with display panel (Figure 4-1) on the ROWPU space
forward bulkhead. A suction blower cabinet is located on the deckhouse top and alarm bells are mounted in the detector
cabinet and in the dayroom. Air sampling accumulators are located in each void and are connected to the smoke detector
cabinet by associated pipes and tubing.
4-3 Capabilities. This system has the capability of simultaneously detecting smoke in one or more voids.
4-4 Special limitations. The smoke detector system samples the air in the voids for smoke only. The system cannot
detect flame or heat. It does not sample air in the ROWPU space, workshop, or dayroom. This system operates on 115
Vac from the void lighting panel. It does NOT activate any firefighting equipment.
Section II. Description of operation
4-5 General. In operation, the smoke detector system's suction blower assembly on the deckhouse top pulls air through
air accumulators in the voids to the smoke detector cabinet. As air passes through the cabinet, it passes through a
lightbeam. If smoke is in the air, it scatters this lightbeam, triggering a photo-electric cell which activates the system.
Alarms sound in the ROWPU space and dayroom. Lights on front of the smoke detector cabinet indicate the space(s) in
which smoke is being produced. In addition, an olfactory (sniffer) valve near the smoke detector cabinet provides a
crewmember with a sample of the smoke. Smelling the smoke may permit crewmembers to determine type of fire or
cause for the smoke.
Section III. Operating instructions
4-6 Controls and Indicators. Operator controls and indicators are at the smoke detector cabinet in the ROWPU space
(Figure 4-1). An olfactory (sniffer) valve is near the smoke detector cabinet. The sniffer valve allows a crewmember to
determine the type of fire by smelling the smoke.
4-7 Prestart procedures.
Make sure smoke detector cabinets in ROWPU space and blower assembly cabinet on deckhouse top
are not damaged and air hose and electrical connections are tight and secure.
Close (ON) power panel 3 circuit breaker 3P13 to supply power to void lighting panel.
Close (ON) void lighting panel 3 circuit breaker 3P13-9 to supply power to smoke detector system.
Operate blower no. 1 on odd-numbered days and blower no. 2 on even days.
Supply power to smoke detector system (Figure 4-1) by setting BLOWER SELECT toggle switch to M1 or
M2. Make sure green POWER ON indicator light on cabinet panel comes on.
Set DAY/NITE toggle switch to DAY. If dark in ROWPU space, switch to NITE.