48 6EM Thru 18GM - 1100 Vertical Turbine Pumps
Mechanical Seals
The mechanical seal covered by these
instructions, when properly installed, will
give satisfactory performance. To ensure
the proper installation these instructions
should be read carefully.
Description
Several types of mechanical seals can be
used. The most common types are the
single inside seal, single outside seal and
the outside cartridge type seal. Since seals
supplied by different vendors may vary in
design, these instructions are general in
nature. Refer to the seal manufacturer’s
specific installation instructions supplied
with your pump or contact the factory.
General Application
The seals described in these instructions
are acceptable for use in pumps handling
water. They are not recommended for
handling fluids which are highly acidic,
highly alkaline, or contain abrasives or
dissolved substances that tend to
crystallize.
Seal Housing
If replacement is required, use the following
procedure to install the seal housing prior to
installing the mechanical seal.
A. Remove the capscrews (431A) which hold the
seal housing (17B) to the discharge head (or the
driver pedestal).
B. Remove the original throttle bushing (17A) and
seal housing gasket (11). Thoroughly clean the
mating surfaces of the seal housing and
discharge head.
C. If a single inside seal, remove the old stationary
seat (456A) from the seal gland (431).
D. Install the throttle bushing (17A) into the seal box
housing (17B).
E. Install the seal housing gasket (11) onto the seal
housing (17B).
F. Install the seal housing with gasket (17B & 11) on
to the discharge head (or driver pedestal), and
secure with capscrews (431A)
G. If a single inside seal, install the new stationary
seat (456A) into the seal gland (431) using an o-
ring lubricant or liquid soap on the o-ring.
Seal Installation
Prior to installation, inspect the seal, seal
housing and gland.
IMPORTANT
Seal faces are lapped and polished to a
mirror finish. It is imperative that sealing
faces be handled with care and kept
perfectly clean. DO NOT touch the sealing
faces.
CAUTION
When installing a seal over a headshaft
without a sleeve, care must be taken so as
to not damage the seal O-ring when passing
over the shaft threads. Ensure shaft
threads are clean and free from burrs. It
may be necessary to lubricate the shaft
threads with an o-ring lubricant or wrap with
plumbers tape prior to installing the seal.
Inside Single Seal
Use the following general procedure to
install this type of seal:
A. Install the stationary seat (456A) into the seal
gland (431) using an o-ring lubricant or liquid
soap on the o-ring.
B. Install the motor. Install the drive shaft (19) if
VHS motor, and tighten the shaft coupling.
Install the flanged adjustable coupling if VSS
motor.
C. Adjust the impellers per instructions in this
manual. Refer to the technical data page in the
drawing section of this manual for the correct
impeller setting.
D. With scribe or marker, place a mark on the shaft
(or shaft sleeve if present) that is level with the
seal housing (17B) face.
E. Position the end of the rotating seal (456) flush
with the mark on the shaft (or shaft sleeve if
present) and tighten the locking screw.
F. Pull the seal gland (431) down and secure with
capscrews (431A).
G. Connect piping to seal gland (431).
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