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Inspection and Maintenance
d. The use of taper gauges is not recommended because the pointed end of the gauge often "bot-
toms" on an internal curved surface before an accurate reading can be obtained. This gauge
should not be used to take radial clearances.
e. Never rotate the unit rotor when the unit is undergoing inspection and maintenance checks with-
out adhering to the below listed precautions.
(1) Thrust bearing must be fully assembled in unit.
(2) Lubricant from unit lube system should be applied to journals.
(3) Check close clearance areas for potential interference and foreign object damage.
(4) Warn personnel working on unit.
16. To properly tighten new Swagelock stop-collar fittings, snug the nut by hand after cleaning threads.
Then tighten the nut until the stop-collar just stops turning.
17. Anti-Seize Compound
a. Anti-seize compound shall be applied on all rotor and stator bolting threads, dowels, rabbets
and sliding fits (internal and external).
External bolting threads for mounting associated equipment, pipe flanges, ductwork etc. Also
apply on vertical flange faces of the top halves of outer casings that may be subject to removal
for maintenance.
Note: This usage must be restricted to a thin film such that the compound
is not forced into the inner gas path. Should this occur, it must where
possible, be carefully removed.
b. Do not apply anti-seize compound to pipe threads or bolting threads internal to oil or water tanks.
18. Sealing Compound
a. Loctite Pipe Sealant with Teflon should be used on all pipe thread joints. The pipe thread must
be clean and free of foreign material before applying the sealant. Follow instructions on container.
b. Loctite Pipe Sealant with Teflon is to be used on all threaded connections to cast iron castings,
after control filters, and in areas over 500 F.
Apply to the male threads so that the first thread is free of any compound.
When a fitting is removed, the female threads shall be cleaned to remove all loose particles of
compound.
19. Joint Compound
a. Joint compound shall not be used on machined joints except as follows:
(1) For compressor and turbine casings apply Perfect Seal only on the surface of horizontal joint
and only for a distance of one (1) inch on both sides of the four (4) way joint. The Perfect
Seal shall not be applied on the surface of the vertical joint.
Standard Practices
SP–3
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