THEORY OF OPERATION - TM-55-1925-292-14-P0051

TM 55-1925-292-14&P

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OPERATOR, UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE

FIREFIGHTING, FIRE ALARM, AND FIRE SUPPRESSION SYSTEMS FOR

INLAND AND COASTAL LARGE TUG (LT)

THEORY OF OPERATION

GENERAL

FIRE ALARM SYSTEM

The purpose of the fire alarm system is to automatically alert the crew by sounding an alarm when sensors

detect smoke or fire. The crew can manually activate the fire alarm system by means of 11 fire alarm pull

stations (figure 1) located throughout the vessel. When one of the various sensors detects an alarm condition

or a fire alarm pull station is actuated, a signal is sent to the fire and smoke detection panel in the Enclosed

Operating Station (EOS). The fire and smoke detection panel activates the alarm, determines in what zone the

alarm condition exists, illuminates the appropriate alarm Light Emitting Diode (LED), and sends the appropriate

signal to the fire alarm system remote indicating panel in the pilothouse. The remote indicating panel in the

pilothouse displays the zone in which the alarm condition exists.

DOWN

PULL

Figure 1. Fire Alarm Pull Station

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