Flowserve ISC - Manual (Page 12)

to overstress these components, e.g. the max permitted
tightening torque must not be exceeded.
6.7 Assemble the pump. Avoid pipe strain. Align coupling properly.
6. With the impeller, shaft, coupling, and bearings in their final oper-
ating positions, tighten the ISC set screws 13 .
See Figure 5.
Inaccurate tightening of these screws can lead to unsafe
situation as mechanical seal may move out of the seal cham-
ber when pressure is applied.
Suggested minimum torque values for set screws are as follows:
Shaft sizes .000” – 2.500” 25 – 65 mm: 4.5 Nm
Shaft sizes 2.625 – 2.750” 70 mm: 13.5 Nm
6.9 Caution: Remove the centering tabs CT from the sleeve collar.
See Figure 6. Save the tabs and fasteners for future use when the
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If removed re-install
the bearing frame first.
6.6 Position the ISC with
the gland tight against
the seal chamber face.
If equipment condi-
tions allow, position
gland with the outlet
port or plugged flush
port as close to the
2:00 position as possible.
See Sections 7 and  for further piping considerations. Otherwise
turn the gland so that the vent tap is as close to the 2:00 o’clock
position as possible and so that the flush piping will clear the
bearing frame.
Caution: Centering Tabs should not be removed or loosened
before tightening the gland bolts and tightening the set screws to
the shaft.
!
Tighten the gland nuts evenly in a diagonal sequence.
Do not over tighten the gland nuts, as this can warp parts and
cause leakage. The suggested ISC minimum torque values are
as follows:
Shaft sizes .000” – .937” 25 – 4 mm: 20 Nm
Shaft sizes 2.000” – 2.750” 50 – 70 mm: 27 Nm
Components provided by the customer for installing the
MS, e.g. the pump cover or fastening screws, must exhibit
adequate properties and dimensions. It must not be possible
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Figure 6
Figure 5
Bearing Frame
Pump
Back
Plate
Figure 4