GE 7FA.05 - Fire Detectors; Ventilation Dampers

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GEK 116862 Inspection and Maintenance Instructions for 7FA.05 Gas Only and Dual Fuel Gas Turbines

6. When the system starts to discharge, relay 45FTX should pick up to trip the turbine. The

fire alarm bell in the accessory compartment should also ring, and the fire flag on the

annunciator should drop.

7. After CO

discharge has stopped, re-set pressure switch 63FP. When the compartments are

clear of CO

, also inspect to see that all ventilation dampers have operated properly.

At the completion of testing, refill the storage unit to capacity, as required. Bubble test the

packing glands of the tank shutoff valve and vapor supply valve for bubble tightness. Leave both

locked in the full-open position. The system is now ready for operation.

NOTE

Puff test does not substitute full concentration test required to fully validate the

effectiveness of the system.

G. Fire Detectors

CAUTION

For CO

systems, if the fire detectors are checked in place, without removal from the

system, the discharge heads must be removed from the medium cylinders to disarm the

high pressure system. The isolation valve must be closed in the low pressure control

cabinet to disable the low pressure system.

The temperature setting of the detector is stamped on its identification plate. It is not possible to

accurately check the calibration of the detector. If it is suspected that a detector is out of calibration, it

should be replaced.

CAUTION

Any physical damage to fire detectors such as but not limited to distortion, dents,

twisting will cause the fire detectors to lose their calibration and serviceability. If any

physical damage is found on the fire detectors they should be replaced.

Open flames such as propane or acetylene torches are not to be used under any circumstances to

check the operation of detectors. The use of propane or acetylene torches causes severe drifting or

destruction of the detectors internals.

H. Ventilation Dampers

CAUTION

Ventilation dampers, automatically closed by a signal from the fire protection system,

must be re-opened before re-starting the turbine. Failure to do so will shorten the service

life of the starting motor and reduce generator performance.