Flowserve GTS Series - Manual (Page 8)

screws evenly to insure uniform compression of the sleeve gasket. Rotate
the rotor assembly to access screws below the split line. The #10-32 HHCS
should be tightened to about 5.65 N-m (50 in-lbf). As a practical matter, this
torque is frequently difficult to measure. Use the following guideline as an
alternative. As the gasket is compressed the torque required to tighten the
screws will steadily increase. When the gasket is almost solid, the torque
will begin to climb much more rapidly. In practice this is very near the
5.65 N-m (50 in-lbf) guideline.
5.19 Tighten the drive collar set screws 57 to secure the seal assemblies to the
shaft. Use a torque of 17.6 N-m (156 in-lbf).
5.20 Remove the remaining setting plate screws 40-2 and remove the setting
plates. Store the 40-1 and 40-2 screws in the setting plate storage holes.
Keep the setting plates and screws for future use.
5.21 Install the top half of the turbine casing. Refer to the turbine manufacturer’s
recommendation for use of split-line sealant and torque values for case
bolts. Ensure that split line sealants do not come in contact with the seal
faces.
Important note: Be very careful if using any sort of flat gasket or “string”
gasket to seal the case split line. Either of these gaskets will create a gap
between the turbine cover and the case. Unless the flat gasket is flush with
the bore of the turbine, the GTS flange gasket 18 will not seal this gap and
will leak.
5.22 Tighten the spanner nuts 9 using the notches on the OD. An adjustable
OD spanner wrench is recommended. Tighten using the spanner wrench
until you cannot turn the nuts.
5.23 Proceed to warm up the turbine slowly. The flange gaskets may begin
to leak as the turbine casing expands. Tighten the spanner nuts until all
leakage stops.
5.24 Start the turbine. Usually, there should not be any visible leakage past the
seals during normal operation. In a cold climate, some steam leakage may
be visible.
6 Installation of Seal (Method 2)
An alternate method can be used to install internally mounted seals that may
make installation easier in some cases. This method can work very well to
remove and reinstall a set of seals that are already on the machine.
6.1 Slide the seal assemblies into place on the shaft as described in Method 1
above.
6.2 Install the thrust bearing. Do not install the other rotor components.
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