Goulds Pumps AF (Axial Flow) (6"-36) MXR Bearings" - Manual (Page 35)

AF (6-36) IOM 33
6. Install the second and third coil as required by
assembly drawing, staggering the cut 90
 to 120.
7. Insert lantern ring into stuffing box, carefully noting
its proper position on the assembly drawing.
Failure to property locate the lantern ring will result
in insufficient packing lubrication. Packing and
shaft sleeve damage may result.
8. After packing and lantern ring are properly
installed, insert gland into stuffing box. Tighten
gland nuts finger tight only. The shaft should turn
freely.
9. Turn lubricant supply on, start pump, and adjust
the gland as described in Section III-E Stuffing Box
Adjustment.
10. Periodic maintenance is absolutely required for all
packed pumps. Normal shaft run-out should be
under .005” to avoid pounding of stuffing box
packing. With excessive shaft run-out, shaft
straightening or replacement is necessary.
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.
STARTING PUMP
PRIMING PUMP
Pumps that are not self-priming must be
fully primed at all times during operation.
Start up Precautions
1 All equipment and personal safety related devices
and controls must be installed and operating
properly.
2 To prevent premature pump failure at initial start
up due to dirt or debris in the pipe system, ensure
the system has been adequately cleaned and
flushed.
3 Variable speed drivers should be brought to rated
speed as quickly as possible.
4 Variable speed drivers should not be adjusted or
checked for speed governor or overspeed trip
settings while coupled to the pump at initial start
up If settings have not been verified, uncouple the
4
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