Chapter 1
Turbine Package System Overview
1-30
Infra Red (IR) Flame Detectors
IR flame detectors (YD5, YD7, and YD8) are provided, suitably located to detect a fire at any
location within the enclosure.
If a detector detects a fire, a turbine shutdown will be initiated and the initial fire extinguishant
charge will be released.
Fault conditions in the infrared detection system are monitored. If a fault is detected in a
detector, a fault warning will be annunciated; if the fault is not rectified within 15 minutes the
turbine will be shutdown (not a fire shutdown).
Gas Detectors
Enclosure ventilation outlet
Two gas detectors (GD1, GD2) are provided, suitably located to detect gas exiting the enclosure
vent outlet.
The detection of gas by any single gas detector in an area will provide fault and low/high alarm
level signals. Operation of the low-level alarm will give an audible warning. Operation of the high-
level alarm will initiate a turbine shutdown, but keep the turbine enclosure ventilation fan(s)
running.
Enclosure ventilation inlet (if applicable)
Two gas detectors (GD3, GD4) are provided, suitably located to detect gas entering the enclosure
vent inlet.
The detection of gas by any single gas detector will provide fault and low/high alarm level
signals. Operation of the low-level alarm will give an audible warning. Operation of the high-level
alarm will initiate a turbine and turbine enclosure ventilation fan shutdown.
Combustion air inlet (if applicable)
Two gas detectors (GD6, GD11) are provided, suitably located to detect gas entering the
combustion air inlet.
The detection of gas by any single gas detector will provide fault and low/high alarm level
signals. Operation of the low-level alarm will give an audible warning. Operation of the high-level
alarm will initiate a turbine shutdown, but keep the turbine enclosure ventilation fan(s) running.
General
If gas is detected at ‘warning’ level then a warning will be annunciated followed 15 minutes later
by a turbine shutdown.
Prior to engine start, if gas is detected at the warning level, purging of the enclosure will take
place and a subsequent recheck. If gas continues to be present at the warning level the start
attempt will be aborted after 15 minutes. If gas is detected at the ‘shutdown’ level, purging of
the enclosure will take place, followed by a subsequent recheck. If gas continues to be present at
the ‘shutdown’ level, a start will not be permitted and should not be attempted.
