Turbine Package Operators Manual
Chapter 1
Turbine Package System Overview
1-15
Fuel System
The fuel system is designed to deliver fuel to the combustion system at the correct pressure and
flow required for the applicable power demand.
General Description
The schematic diagrams of the
Fuel System
can be found in this Manual Volume.
The fuel system comprises:
Off-skid Components
•
block and vent valve assembly (XV30, XV31)
•
demister (if applicable)
•
filter/coalescer (if applicable)
On-skid components
•
gas fuel supply strainer (XF94)
•
two block valves (XV6, XV7)
•
vent valve (XV212)
•
main fuel control valve/actuator assembly (XV150, XM26)
•
pilot fuel control valve/actuator assembly (XV149, XM27)
•
electronic control unit
•
system monitoring and control instrumentation
•
pipeline trace heating (if applicable).
Gas Fuel System Components
Off-Skid Block and Vent Valve
The block and vent valve assembly is located in the customers gas supply line. The assembly
comprises of a block valve (XV30) and a vent valve (XV31). Both valves are controlled by
pneumatically operated rotary actuators. Air is directed to the actuators by solenoid valves
(SOL12 and SOL11) respectively. When the situation demands, the block valve closes to prevent
gas entering the on-skid fuel system and the vent valve opens to vent the interconnecting
pipework.
The block valve is spring loaded to fail in the ‘closed’ position. The vent valve is spring loaded to
fail in the ‘open’ position.
