Turbine Package Operators Manual
Chapter 1
Turbine Package System Overview
1-29
Fire & Gas Protection System
The turbine acoustic enclosure is provided with a fire and gas monitoring system and a fire
extinguishant system to protect the installation should a gas leak or fire be detected. A
schematic diagram of the Fire System is located this Manual Volume.
General Description
The system comprises gas detectors, infrared flame detectors and heat detectors mounted in the
turbine enclosure. Fire extinguishant cylinders are mounted external to the enclosure with an
associated release mechanism, which delivers the extinguishant through pipework to nozzles
located inside the enclosure. The system is automatically controlled by the fire and gas
monitoring module located within the unit control panel. A manual extinguishant release button,
on the turbine extinguishant release control panel located on the unit control panel, enables
manual operation of the system. Audible and visual alarm units are fitted to the turbine
enclosure roof.
Ventilation dampers, which are situated in the enclosure ventilation inlet and outlet ducts, are
used to prevent the loss of extinguishant to atmosphere if a fire occurs.
System Control and Operation
A twin shot system provides initial and reserve extinguishant charges. If a fire is detected either
via the heat detector(s) or via infrared flame detectors then the turbine, all AC power supplies
and fuel is shut down and isolated. After a short time delay, the initial charge of extinguishant is
released and the DC motor driven emergency lubricating oil pump automatically starts.
If the extinguishant release is not detected by the in-line pressure switch, the reserve shot will be
released. After a successful release is detected, then any further automatic releases are inhibited
for 20 minutes. The emergency lubricating oil pump will continue to run.
Note: If a fire is considered to be due to a lubricating oil leak and being
potentially fed by the emergency lubricating oil pump, then it is the
responsibility of the operator to decide whether to switch off the pump or allow it
to continue running.
The CO
2
extinguisher cylinders must be isolated from the engine package during maintenance. A
signal from the isolation valve inhibits a gas turbine start attempt when the valve is in the
isolated position.
System Components
Heat Detectors
Heat detectors (TD2A (TD2B, TD13, TD21 - optional)) are mounted in the turbine enclosure. If a
heat detector detects a fire, a fire shutdown will immediately be initiated, and the fire
extinguishant released after a predetermined time delay.
