Page 71 - Machinery Component Maintenance
P. 71
56 Machinery Component Maintenance and Repair
STAGE 1 LARGE
STAGE 2 LARGE
STAGE 2 SMALL
STAGE 3 LARGE
STAGE 3 SMALL
STAGE 5 LARGE
STAGE 5 SMALL
STAGE 6 LARGE
STAGE 6 SMALL
STAGE 7 LARGE
STAGE 7 SMALL
BALANCE PISTON
FINAL MID
SPAN RUN OUT
NOTE: CLEARANCES ARE DIAMETRAL
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SPECIAL NOTES OR PRECAUTIONS:
Figure 2-17. Clearance tabulation.
charge of the overhaul will normally delegate this task to the instrument
group after collaborating on the list with this group and the operating de-
partment to pinpoint any troublesome items. Key shutdown instruments
such as low oil pressure and high discharge temperature should, of
course, receive as accurate a test as practical.
The Factory Serviceperson
Most machinery manufacturers’ manuals recommend the use of a fac-
tory serviceperson. It is most important to know whom you are getting
and what his qualifications are. One maintenance manager had the unset-
tling experience of shaking the hand of a serviceman from a major sup-
plier of gas turbines who then mentioned that he normally worked on
steam turbines and this would be his first gas turbine. The point is, after
several years in the field, assuming continuity of plant personnel, the
user many times will know more about the machine than its manufac-
