Flowserve ISC2 Series - Manual (Page 13)

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overstress these components, e.g. the max permitted tightening
torque must not be exceeded.
6.8 Assemble the equipment per manufacturer specifications. Avoid
pipe strain. Align the coupling per manufacturer specifications.
6.9 With the impeller, shaft, coupling and bearings in their final oper-
ating position, tighten the drive collar set screws. See Figure .
Recommended ISC2 seal minimum set screw torque by size range:
Seal
inch 1.000 - 2.500 2.625 - 2.750 2.875 - 8.000 2.875 - 8.000
Size (mm) (25 - 60) (67 - 70) (75 - 203) (75 - 203)
Gland Size All All Standard Bore Enlarged Bore
Torque 0 in-lbs 120 in-lbs 150 in-lbs 20 in-lbs
(.5 N-m) (13.5 N-m) (16.9 N-m) (27.1 N-m)
Inaccurate tightening of these screws can lead to unsafe situa-
tion as mechanical seal may move out of the seal chamber when
pressure is applied.
Figure 5
Figure 4