GE Frame 5 Service Manual

GE Power & Water
Heavy-Duty Gas Turbine  
Operating and Maintenance 
ConsiderationsGER-3620M (02/15
)
Jamison Janawitz
James Masso
Christopher Childs
GE Power & Water
Atlanta, GA 

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Contents
Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
 . . . . . . . . . . . . 1
Maintenance Planning   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
 . . . 1
Gas Turbine Design Maintenance Features   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

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Appendix  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
 . . . . . . . . . . . . .  .36
A .1) Example 1 – Hot Gas Path Maintenance Interval Calculation   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
A
 .2
 ) Example 2 – Hot Gas Path Factored Starts Calculation
 
  . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

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Introduction
Maintenance costs and machine availability are two of the most 
important concerns to a heavy-duty gas turbine equipment 
owner. Therefore, a well thought out maintenance program that 
reduces the owner’s costs while increasing equipment availability 
should be instituted. For this maintenance program to be effective, 
owners should develop a general understanding of the relationship 
between the operating plans and priorities for the plant, the skill 
level of operating and maintenance...

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and maintenance of the turbine. (See Figure 2.) Many of the TILs 
contain advisory technical recommendations to help resolve 
issues and improve the operation, maintenance, safety, reliability, 
or availability of the turbine. The recommendations contained in 
TILs should be reviewed and factored into the overall maintenance 
planning program.
•	 O&M Manual
–
T

urbine-specific manual provided to customer
–
I

ncludes outline of recommended Inspection and
Repair requirements
–
H

elps customers to...

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•	All turbine buckets are moment-weighed and computer charted
in sets for rotor spool assembly so that they may be replaced
without the need to remove or rebalance the rotor assembly.
•	 All bearing housings and liners are split on the horizontal
centerline so that they may be inspected and replaced when
necessary. The lower half of the bearing liner can be removed
without removing the rotor.
•	 All seals and shaft packings are separate from the main
bearing housings and casing structures and may be...

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Borescope inspection access locations for F-class gas turbines 
can be found in Appendix E.
Figure 4  provides a recommended interval for a planned   
borescope inspection program following initial baseline 
inspections. It should be recognized that these borescope 
inspection intervals are based on average unit operating modes. 
Adjustment of these borescope intervals may be made based 
on operating experience, mode of operation, fuels used, and the 
results of previous borescope inspections.
In...

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Major Factors Influencing 
Maintenance and Equipment Life
There are many factors that can influence equipment life, 
and these must be understood and accounted for in the 
owner’s maintenance planning. Starting cycle (hours per start), 
power setting, fuel, level of steam or water injection, and 
site environmental conditions are some of the key factors in 
determining maintenance interval requirements, as these factors 
directly influence the life of replaceable gas turbine parts.
Non-consumable...

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Figure 7 . Hot gas path maintenance interval comparisons. GE method vs. EOH method
GE vs. Equivalent Operating Hours (EOH) Approach
1400
1200
1000 800
600
400
200
0 0  4  8 12  16 20  24  28
Thousands of Fir ed Hours
StartsCase 2
8,000 Hrs/Y r
160 Star ts/Yr
GE Every 3 Yr
EOH Every 2.1 Yr
Case 1
4,000 Hrs/Y r
GE Method 300 Star
ts/Yr
GE Every 4 Yr
EOH Every 2.4 Yr
Continuous
Unit
Figure 6 . GE bases gas turbine maintenance requirements on independent counts of starts and hours