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4.4 Inspect the areas of all sealing surfaces. This includes the areas
near the flange gaskets 18 and sleeve gaskets 19 . See Figure 2.
These areas must be free from any large pits, corrosion, or steam
erosion. Any damage in these areas must be repaired to insure
proper sealing of the static gaskets.
4.5 Mismatch on the face of the turbine at the split line should be less
than 0.0127 mm (0.0005 inch). If not the surface should be stoned
or machined to bring it into specification.
4.6 Hand polish the shaft to remove any burrs or buildup of deposits.
Any damage in the seal areas should be repaired or the shaft re-
placed prior to seal installation.
5
Installation of Seal
5.1 Remove the seal assemblies from the box. Inspect for any
obvious signs of mishandling or damage.
5.2 Set aside the sleeve gaskets 19 and flange gaskets 18 for
installation at step 5.4.
5.3 Develop the piping or tubing for the steam traps. Take a seal as-
sembly, minus gaskets, and place it in the lower half of the turbine
case on the exhaust / coupling side. This side usually has the least
space available between the case and bearing bracket. Hold the
seal in place with two of the SHCS 40-2 . The pipe or tubing exiting
the drain must not hit the case or bearing bracket. Tubing can be
bent and cut with simple tools and provides a great deal of flexibility.
Tube fittings make it easy to connect and disconnect the drain dur-
ing installation. Check to make sure the configuration developed for
the exhaust / coupling end will also work for the inlet / governor end.
5.4 Install the flange gaskets 18 into the grooves on the flanges. Apply
a small dab of silicone grease to the gasket to hold it in the groove
during assembly. Wipe off any excess grease so that it will not
get into the seals. Grease contamination in the seal may compro-
mise performance.
5.5 If the turbine has a sealant groove at the split line and on the turbine
face it may interfere with the function of the flexible graphite gasket
normally used. In this case, seal metal to metal, gland to turbine,
with the same sealant used on the split line. Only use a very light
coat of sealant on the turbine face. Be careful not to get the
sealant on the seal faces.
7
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