Turbine Package Operators Manual
Chapter 1
Turbine Package System Overview
1-31
Ventilation Dampers
Dampers (YV1 and YV2), located in the enclosure vent inlet and outlet respectively, are
automatically opened during turbine operation by instrument air pressure. When the turbine is
shutdown, the controlling solenoids (SOL162 and SOL161) are de-energized and the dampers will
close under spring pressure. In the event of a fire, the dampers will therefore be closed to retain
the fire extinguishant.
Extinguishant Bottles
Four fire extinguishant bottles, two initial (XX16 and XX17) and two reserve (XX19 and XX20),
are positioned on a skid outside the turbine acoustic enclosure with connecting pipework to
nozzles within the enclosure. The bottles are suspended from automatic bottle weighing devices,
if either of the initial or reserve bottles indicates low contents a warning is annunciated on the
turbine control module. If BOTH sets of bottles indicate low contents then a warning will be
annunciated followed 15 minutes later by a turbine shutdown.
The fire extinguishant is released by either a signal from the turbine control module or by manual
actuation from the breakglass units located on corners of the turbine enclosure package
(optional) and one located on the turbine control module. The bottles give the capacity for an
initial automatic or manual release of extinguishant followed by the option of another automatic
or manual reserve release. Both sets of bottles may be manually fired by operating the manual
lever actuator located on top of the bottles.
A valve is provided adjacent to the extinguishant bottle skid for manual isolation. The valve is
fitted with limit switches to indicate when the valve is fully open or closed. When the valve is
closed the enclosure vent system trip is inhibited.
An integral safety feature of the extinguishant bottle skid is the provision of five bursting discs to
safeguard against system overpressure. The discs are positioned on the ‘initial’ first bottle (PSE4),
‘initial’ second bottle (PSE5), ‘reserve’ first bottle (PSE6), ‘reserve’ second bottle (PSE7) and
upstream of the manual shut off valve (PSE3).
Instrumentation
Pressure Monitoring
Pressure monitoring is provided as follows:
Fire Extinguishant Bottles
Pressure switches (PS8 and PS73) provide the unit control panel with a C0
2
Gas Gone warning for
both Initial and Reserve cylinders respectively.
