Goulds Pumps 3420 - IOM - Manual (Page 41)

MAINTENANCE OF SHAFT SEALS
MECHANICAL SEALS
When mechanical seals are furnished, a manufacturers
reference drawing is supplied with the data package. This
drawing should be kept for future use when performing
maintenance and adjusting the seal. The seal drawing will
also specify required flush liquid and tapped connections.
The seal and all the flush piping must be checked and
installed as needed, prior to starting the pump.
The life of a mechanical seal depends on various factors
such as cleanliness of the liquid handled and its lubricating
properties. Due to the diversity of the operating conditions
it is, however, not possible to give definite indications as to
its life.
s
! WARNING
Never operate the pump without liquid supplied to the
mechanical seal. Running a mechanical seal dry, even
for a few seconds, can cause seal damage and must be
avoided. Physical injury can occur if the mechanical
seal fails.
!
The mechanical seal used in an ATEX classified
environment must be properly certified.
!
The mechanical seal must have an appropriate seal
flush system. Failure to do so will result in excess
heat generation and seal failure.
!
Leakage of process liquid may result in creating an
explosive atmosphere. Follow all pump and seal
assembly procedures.
!
Sealing systems that are not self purging or self
venting, such as plan 23, require manual venting
prior to operation. Failure to do so will result in
excess heat generation and seal failure.
PACKED STUFFING BOX
s
! WARNING
Lock out driver power to prevent accidental start-up
and physical injury.
The stuffing box is not packed at the factory and must be
packed properly before operating the pump. The packing is
furnished in the box of fittings which accompanies the
pump. The packing used must be suitable for the pumpage.
Make sure the stuffing box is clean. Examine the shaft
sleeve for wear or scoring, replace if necessary. Refer to
Preparation for Start-up (p. 25) for packing installation
instructions.
3420 IOM 8/09
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