Flowserve MSS Series - Manual (Page 10)

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Note: Do not attempt to remove sealing face mismatch with the
gland joint shoulder screws 414.1 fully tightened. Doing so
may damage the stationary face.
3.10 Insert the plastic centering device 92 between the insert ID
and the shaft.
3.11 Carefully fasten the gland to the seal chamber by tightening the
gland fasteners to a 3.4 N-m (30 lb-in) maximum torque while feeling
for seal face mismatch at stationary face joints. If any mismatch
exists, loosen gland fastenings and shoulder screws 414.1 , repeat
step 3.9 and 3.10. Then proceed with tightening gland fasteners
while again checking for sealing face mismatch.
Important: Do not overtighten the gland fastening nuts or bolts
as overtightening on some equipment may cause the stationary
face to distort which may result in leakage at the sealing faces. It is
not necessary for the gland to have metal-to-metal contact with the
seal chamber face for the inner stationary face mounting O-ring to
form a seal. The stationary seal face must, however, be square with
the axis of the shaft to within 0.020 inch FIM.
3.12 Remove the centering device 92 . Retain it for re-use with the
spare parts kit.
3.13 Mount the rotating seal face halves 15 around the shaft and fasten
them together using the cap screws 40 provided, tighten to a 3.4 N-m
(30 lb-in) torque maximum. Check for seal face joint mismatch. If any
mismatch exists, loosen the cap screws and shift the rotating face
halves until no mismatch is felt. Retighten the cap screws.
Note: There are threads on both halves of the rotating seal face.
Align halves carefully; do not allow a gap between halves
during tightening.
3.14 Clean the rubbing faces of the rotating and stationary face with
alcohol and place the rotating face so that its rubbing face is against
the stationary rubbing face. See Step 2.7.
3.15 Position the split shaft packing O-ring 76 around the shaft and
bond the joint ends together as in Step 3.1. Lubricate the O-ring
with the silicone lubricant provided and push the O-ring into the seal
ring bore. See Step 2.8.
3.16 Install the white split backing ring 44 into the seal ring bore next
to the O-ring. Install the two black elastomer backing rings 44.1.
Be sure to stagger the backing ring joints by 120°.
Do not bond the backing ring joints together .