Aux Steam
What is the primary function of the Aux Steam System?
to supply superheated steam to the gland seal system, deaerator, ACC collection tank, and SJAE
What type of seal is used for the steam seal system?
Labyrinth
What is the primary function of the Feedwater system?
to provide water to the HRSG for steam production and fuel gas performance heating
What is the source of spray water for the LP Bypass?
condensate system
What is the primary purpose of the fuel gas system?
to supply clean, dry, pressurized fuel gas to the turbine and duct burners
What two systems supply steam to the Aux Steam Header?
Main Steam System & Cold Reheat System
What is the normal operating pressure of the gland steam header?
4.06 psig
How many BOP systems interfaces with the feedwater system?
Nine
How many HP steam stop/control valves are there?
1
What is used to heat the main fuel gas heater?
IP Feedwater
Where is the water for the desuperheater supplied from?
Condensate System
What kind of heat exchanger is the gland steam condenser?
shell and tube heat exchanger
What does IAS provide in the feedwater system?
Dry compressed air for pneumatically operated valves
When is the steam turbine bypass system primarily used?
any time the CT is firing but the ST is not accepting steam
What is the supply pressure going to the duct burners?
50-55psig
When is the Aux Steam System placed in service and why?
during startups and at low turbine loads to provide superheated steam when Main steam and Cold reheat require attemperation
What controls the amount of vacuum on the gland steam condenser?
the gland steam condenser exhaust fans
What is the purpose of the nitrogen blanketing system?
to provide nitrogen gas for purging the pipeline downstream of the IP economizer
Where does the drains from the HP steam header go?
Atmospheric and HRSG Blowdown tank
How many pressure control valves are in the GT compartment?
5
What is the purpose of the Gland Seal System?
to provide sealing steam to the Steam Turbine Generator turbine (keep steam in, keep air out)
At what load does the steam turbine generator become self-sealing?
at 65%
During the filling of the feedwater system, what procedure must be followed?
all low point drains closed and high point vents open
What is the purpose of the non-return valves?
to prevent steam from back flowing into the turbine
What is the normal operating pressure at the GT fuel gas inlet?
715-740psig