Flowserve MSS - Manual (Page 10)

10
!
Be careful not to let O-ring fall in to the bore.
6.4 Install the stationary face halves  around the shaft with the lapped face outward
(non-lapped face is identififed with a groove or part marking) away from the seal
chamber face. Hold the stationary face up
and place the bonded O-ring over the sta-
tionary face shoulder closest to the seal
chamber face. Pilot the inner stationary face
shoulder into the seal chamber bore.
6.5 Bond and lubricate the second statio-
nary face seat gasket O-ring 6 around
the shaft and place it over the outer sta-
tionary face shoulder.
6.6 Position the gland ring halves 1
around the shaft with the counterbore
facing the stationary face. Place the
gland halves around the stationary face
and fas-ten them together using the
shoulder screws
K provided.
!
Be sure the gland ring joints are in line with the stationary face joints and
the two bolt holes are in line with the bolt holes or studs in the seal chamber
face.
!
It is imperative that the centering of the mechanical seal type MSS components
in the mixer vessel’s assembly flange without force. Under no circumstances may
the given fit tolerances be exceeded.
6.7 Carefully fasten the gland to the seal cham-
ber by tightening the nuts or bolts to a 30
lb-in (3.4 Nm) maximum torque while feeling
for sealing face mismatch at the stationary
face joints. If any mismatch exists, loosen
the nuts or bolts and shift the stationary face
halves until no mismatch is felt. Retighten the
nuts or bolts.
!
Do not overtighten the gland nuts or
bolts as overtightening on some equip-
ment 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
O-ring over the stationary face outer shoulder
Reference 6.5
Fasten the gland ring to the seal
housing
Reference 6.7