Flowserve L Worthington Simpson - Manual (Page 27)

L and U USER INSTRUCTIONS ENGLISH 85392721 07-12
Page 27 of 36 flowserve.com
6.10.2 Pre-assembly of casing gasket
a) Fit casing gasket to the bottom half horizontal
flange using a small amount of contact adhesive to
prevent movement when the top half is fitted. Do
not apply adhesive to the top surface of the gasket.
b) It is important that the external corner of the
casing gasket face and the stuffing box face is as
sharp as possible.
c) Ensure threads, gasket and O-ring mating faces
are clean. Apply thread sealant to non-face
sealing pipe thread fittings.
6.10.3 Bearing housing and rotating element
assembly
a) Ensure all gaskets and O-rings are renewed and
replaced in their correct position during assembly.
b) When re-assembling the impeller(s) on the shaft, it
is important to mount the impeller so that the vane
tips point away from the apparent flow direction.
The rotor always rotates toward expanding section
of the volute.
Discharge
Suction
c) On two stage pumps (U) fit the spacer sleeve and
interstage bushing [2410, 1610 - 6U18H only]
between the impellers.
d) When mechanical seals are fitted the rotating parts
can be slid onto the sleeves (following the seal
manufacturer's instructions) before the sleeves are
fitted onto the shaft. The seal locking collars
should be left loose. Fit the sleeves, sleeve nuts
[(loosely), packing seating rings, lantern rings,
impeller rings, glands or seal seat and covers,
water throwers and bearing covers.[4130,
1630,4134,1500, 4120, 2540 3260]
e) Press the bearings [3011] onto the shaft. [2100]
Note where double row bearings are fitted these
must be “back to back”.
f) Tighten the bearing shaft nut.[3712] It is
recommended that a locking compound is applied
to the threads (egg Loctite 222). Apply clean
grease to the bearings and fit the bearing
housings.[3200] Fit the coupling hub.
g) Place the complete rotating assembly into the
casing and bolt the bearing housings [3200] to the
casing.[1213]
h) Centralize the impeller(s) and then tighten up the
sleeve nuts after applying a locking compound to
the threads (e.g. Loctite 222).
i) Set the seals, if fitted, to the correct working length
and tighten the seal collar screws.
j) Fit the casing upper half [1214] ensuring that
impeller rings and anti-rotation pins [1500, 6810]
are in the correct position and the casing dowel
pins are located. Ensure the shaft rotates freely.
k) Push the seal covers into place and fasten to the
casing, where fitted.
l) Pack the gland in accordance with the required
arrangement. (See drawings.)
m) Loosely tighten the gland [4120], check coupling
alignment, fit coupling drive element(s) and fit
guards.
Pump sizes 4L13, 6L11 and 6L13 have 5 rings of packing.
All other units have 4 rings of packing.