Goulds Pumps AF (Axial Flow) (42"/1200mm/54/60"/66") LM/LMR Bearings - IOM" - Manual (Page 34)

34 AF (42-66) IOM
GLAND ADJUSTMENT
Adjust the stuffing box if packing is used. When the
pump is first started, there should be considerable
leakage by the gland to cool the packing. Gradually
tighten the gland nuts on flat at a time while observing
the leakage and stuffing box temperature. Packing
requires time to “run-in” and extra coolant (leakage)
while it is being “run-in”. If the leakage is reduced too
quickly, the packing will overheat and may be destroyed.
The shaft sleeve may also be damaged.
LEAKAGE
Normal leakage for a properly adjusted box,
depending on shaft size and speed, varies
from a few drops a second to a small trickle
out of the gland.
MECHANICAL SEAL
The mechanical seal used in an ATEX
classified environment must be properly
certified.
The mechanical seal must always be properly
flushed. Failure to do so will result in excess
heat generation and seal failure.
Most mechanical seals are installed and adjusted at the
factory. A common seal type used on the AF pump is
the cartridge type. Cartridge seals are preset at the seal
manufacturer’s facility and require no field settings. Due
to size and design, some installed mechanical seals are
supplied with holding clips. These clips keep the sealing
faces apart to avoid damage during transport. The clips
must be removed before the shaft is to be rotated.
Pumps with retained seal faces will be specifically
marked and instructions from the seal manufacturer for
clip removal will be provided.
If the seal has been installed in the pump at the Goulds
factory, these clips have already been removed. For
other types of mechanical seals, refer to the seal
manufacturer’s instructions for installation and setting.
Mechanical seals have a stationary and a rotating
sealing face. Commonly, these sealing rings are of
carbon and ceramic material, brittle in nature, and easily
damaged. As the sealing rings seat with the operation of
the pump, a compatible wear pattern develops between
the mating surfaces.
To disassemble the mechanical seal after the wear
pattern is established would necessitate the replacement
of the rotating element and stationary sealing elements.
Do not replace only one component.
To insure the life and sealing characteristics of the
mechanical seal, lubricating liquid must be circulated
through the seal gland. Clear, grit-free liquid is
necessary. Goulds Pumps strongly recommends the
stocking of replacement sealing elements.
WARNING
Do not make shaft adjustments on mechanical seal
installations without consulting seal instructions and the
pump assembly drawing. Damage to the mechanical
seal may result.
Dynamic seals are not allowed in an ATEX
classified environment.
!