6EM Thru 18GM - 1100 Vertical Turbine Pumps 49
Outside Single Seal
Use the following general procedure to install this
type of seal.
A. Install the seal gland (431) containing the
stationary seat (456A) on the seal housing face
and secure with capscrews.
B. Install the rotating seat (456) and retainer (456B)
ring over the shaft or sleeve. Do not fasten the
retainer to the shaft (or shaft sleeve if present)
until impellers have been properly adjusted.
C. Install the motor. Install the drive shaft (19) if
VHS motor, and tighten the shaft coupling.
Install the flanged adjustable coupling if VSS
motor.
D. 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.
E. Compress the retainer (456B) and rotating
assembly (456) until the correct spring gap is
attained. The gap is stamped on the seal retainer
or may be included with the seal manufacturers
printed instructions.
F. Secure the retainer ring (456B) with setscrews.
G. Connect piping to seal gland (431).
Cartridge Seal
Use the following general procedure to install this
type of seal:
A. Install the complete seal assembly on the seal
housing. Do not secure with provided hardware
at this time.
B. For split cartridge seals, refer to the seal
manufacturer’s specific installation instructions.
Impeller adjustment is required prior to
installation.
C. Install the motor. Install the drive shaft (19) if
VHS motor, and tighten the shaft coupling.
Install the flanged adjustable coupling if VSS
motor.
D. 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.
E. Secure complete seal assembly with supplied
hardware.
F. Secure collar set screws.
G. Remove plastic tabs, setting devices, or pull cord
to set proper spring compression.
H. Connect piping to seal gland (431).
IMPORTANT
All seals, regardless of type or manufacturer,
must be piped to purge all air out of the seal
housing cavity. The appropriate API Piping Plan
for the installation should be employed.
Operation
Special operating techniques are involved
when using pumps equipped with
mechanical seals. Certain precautions
should be taken as follows:
Installation, Operation and Maintenance
A. The seal should never be operated dry, even to
check for rotation. A water source must be
provided to cool and lubricate the seal faces
during pump operation. The lubricating water can
be either the pumped media or an external water
source.
IMPORTANT
To prolong seal life, it is recommended
on all installations to lubricate the
mechanical seal prior to each motor
start.
B. If the pumped media is used for seal cooling and
lubrication, a vent line must be provided to
prevent air entrapment in the seal cavity, such as
demonstrated by API Plan 13.
C. Lubrication via the pumped media is not
recommended for vertical turbines in which 1)
the lift is in excess of 35 feet, or 2) they are to be
operated by a soft start or variable frequency
drive. The excessive time required for the
pumped media to reach the seal at each start will
result in premature seal failure. In these
situations, an external water source is required.
D. If an external water source is used, it must be
clean to within 100 microns and introduced to the
seal prior to each motor start.
E. If an external water source is used to flush the
seal during operation, adequate flow must be
provided to maintain 15 fps minimum velocity
between the throttle bushing and shaft.
Shaft or Sleeve Dia. Flow Rate (GPM)
1 ¾ to 1 ¼
1 ¼ 1 to 1 ½
1 ½ 1 ¼ to 1 ¾
1 11/16 1 ¼ to 1 ¾
1 15/16 1 ½ to 2 ¼
2 3/16 1 ¾ to 2 ½
2 7/16 2 to 2 ¾
2 11/16 2 to 3
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