CAT Titan 250 - Manual (Page 49)

Turbomachinery Package Specification Titan 250 Generator Set
The enclosure is also equipped with two gas detectors: one at the gas turbine enclosure
ventilation air inlet and the other at the ventilation exhaust to provide continuous
monitoring of combustible gases. The detectors consist of IR hydrocarbon sensors that
provide input to the logical operating network (LON) module. The gas turbine start signal
is interlocked with the combustible gas monitoring system to ensure the atmosphere is
safe prior to initiating a turbine engine start. An alarm is initiated if the gas monitor fails.
OPERATOR PANEL
EQP
DCIO
MIR MIR
MIR MIR
IR IR
TD TD
TD TD
Turbotronic 4
Control
Processor
Turbotronic 4
Back-up
Shutdown
System
Turbomachinery Package
To / From Customer
Supervisory System
STROBES / HORN
FIRE
SUPPRESSION
SYSTEM
AUTO
INHIBIT
DISCHARGED
AUTO / INHIBIT
MANUAL RELEASE
LON
DCIO
MIR = Multi-spectrum IR Flame Detector
TD = Thermal Detector
IR = IR Gas Detector
LON = Local Operating Network
ControlNet
Figure 22. Typical Fire and Gas System
11.3.9 CO
2
Fire Suppression System
The enclosure can be equipped with a CO
2
fire suppression system consisting of a
primary total flooding distribution system and a secondary metered distribution system to
extend the design concentration of 37% CO
2
for 20 minutes.
On fire detection by the optional fire and gas detection system, the detectors transmit an
electrical signal via the fire control panel to activate the fire suppression system release
solenoids located in the CO
2
fire suppression cylinder cabinets (Figure 23). On receipt of
this signal, the solenoid actuated control heads activate the CO
2
cylinders, releasing CO
2
into the enclosure. CO
2
pressure actuates the pressure trip operated dampers that close
all vent openings. CO
2
release control heads are also provided with manual release
levers.
11.3.10 Water Mist Fire Suppression System
The enclosure can be equipped with a water mist (fine water spray) fire suppression
system consisting of a high-pressure distribution system to provide approximately 10
minutes continuous water discharge. The typical water mist fire suppression cylinder
cabinet (Figure 24) consists of two high-pressure nitrogen cylinders used as a propellant
and five water bottles.
© 2008 Solar Turbines Incorporated. All rights reserved. TPS250GS/908 - Preliminary
48