GE 7FA.05 - Compressor Bleed Valves; Compressor Discharge Pressure Transmitters; Case Temperature Management; Starting System

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Inspection and Maintenance Instructions for 7FA.05 Gas Onl

and Dual Fuel Gas Turbine

GEK 116862

C. Compressor Bleed Valves

These valves should operate freely with no evidence of sticking. Where sticking is evident, contact

the vendor and GE engineering.

WARNING

DO NOT ATTEMPT TO PERFORM ANY IN-FIELD SERVICING OF

THE BLEED VALVES WITHOUT PROPER AUTHORIZATION AND

INSTRUCTION FROM THE VENDOR AND GE ENGINEERING.

IMPROPER SERVICING CAN DETRIMENTALLY AFFECT VALVE

PERFORMANCE.

D. Compressor Discharge Pressure Transmitters

Check that the transmitter is calibrated within the limits described in the Control Specification.

E. Case Temperature Management

Many CTM components will need to be removed during standard gas turbine maintenance. These

include the CTM Manifolds, On-Base Piping System and Embedded Casing Thermocouples and

associated conduit and wiring. It is critical that the following areas are addressed when re-assembling

the CTM system components following their removal:

1. CTM manifolds properly secured on the turbine casing with proper gaps maintained. All

integrated support/thermowell mounts shall be fully (thread engaged) in the casing and leveling

support nuts “snug” against the casing surface.

2. Embedded casing TC’s shall be inspected for damage prior to reinstallation. When inserted, it

shall be conﬁrmed that the ﬁttings are fully engaged in the support/thermowell mount. Loop

checks shall be performed on any TC’s removed and/or replaced.

3. The ﬂexible metal ducting shall be inspected for damage that could impact airﬂow. If damaged,

the ducting section shall be replaced with a new part. All T-bolt clamps used to connect ducting

to hard pipe interfaces (on manifolds an on piping) shall be inspected to insure they are tight.

XVIII. STARTING SYSTEM

A. Turning Gear Motor

See Vendor’s Preventive Maintenance Procedure in Starting System Section.

B. Gear Box

Check for sight glass for presence of oil. Reference Vendor Operation and Maintenance Manual for

other periodic maintenance procedures required for the gear box.

C. Flexible Coupling

Check flexible coupling for visible damage or wear. Check disk packs for allowable spacing

according to Vendor’s Operation and Maintenance Manual.