GE MS6001B, Maintenance Instructions Manual

Page: 98 / 370

Auxiliary and Controls Systems Maintenance Inspection and Maintenance
ACSM–8
Inspection
Document
or Page
Reference Inspection
Frequency and
Turbine Status
What to Inspect for
FUEL GAS SYSTEM (if applicable)
Gas Control Valve
Gas Leakage at Stem, Packing Leak
Off or Vent
Hydraulic Cylinder Rod Seal Leakage
Rough Operation
Improper Operation of Trip Relay
Damage Control Surfaces of Valve
Plug and Seat
Trip Action with Loss of Hydraulic
Trip Oil
M — O
M — O
SA — S
SA — S
Maj — S
SA — S
IMP–13
SPEEDTRONIC
Control Loop
Valve Unstable, Slow Movement,
Stroke Out of Specification, P2 in Error
Calibration, FCR Versus Stroke, Gas
Control Valve
Speed Versus P2 Speed Ratio Valve, P2
Transducer Calibration, LVDTs
Calibration
Electronic Trip action of 20FG
and 20 HD
Check 20FG for Proper Null Bias
D — O
A — S
A — S
SA — S
SA — S
Control
Specification,
Control
Specification–
Operating
Instructions and
Sequences and
Control
Specification–
Control System
Adjustments
HIGH PRESSURE CONTROL OIL SYSTEM HYDRAULIC SUPPLY
Main Hydraulic Supply
Pump
Excessive Vibration or Unusual Noise
Improper Discharge Pressure
Relief Valve Leaking
Leakage at Shaft and Mounting
Flanges
M — O
D — O
A — O
M — O
IMP–13
Auxiliary Hydraulic Supply
Pump
Low Discharge Pressure
Leakage Around Shaft and Mounting
Flanges
Excessive Vibration or Unusual Noise
A — S
M — O
M — O
IMP–13
Hydraulic Supply Manifold
Connections Loose or Leaking
A — S
IMP–13
Air Bleed Valves
Improper Air Bleed Valve Operation
A — S
IMP–14