Mechanical Seals - Goulds Pumps JC Installation, Operation And Maintenance Instructions

9. Follow pump start-up procedure. Turn on stuffing box lubricating liquid and start pump.
10. A significant amount of lubricating liquid should leak from gland side of stuffing box.
11. Periodic maintenance is absolutely required for all packed pumps.

Mechanical seals

WARNING:
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Most mechanical seals are installed and adjusted at the factory. Due to size and design, some
installed mechanical seals are supplied with shipping retainers. Shipping retainers hold the
sealing faces apart to avoid damage during transport. Shipping retainers must be removed
before shaft is to be rotated. Pumps with retained seal faces will be specially marked and
instructions from the seal manufacturer for retainer removal will be provided.
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 and stationary sealing elements. Do not replace
only one component.
To ensure the life and sealing characteristics of the mechanical seal, lubricating liquid must be
circulated through the stuffing box. Clear, grit free liquid is necessary.
Special seal information and replacement seal elements should be provided by the seal
manufacturer. Goulds strongly recommends the stocking of replacement sealing elements.
CAUTION: Do not make shaft adjustments on mechanical seal installations without consulting
seal instructions and pump assembly drawing.
Model JC Installation, Operation and Maintenance Instructions
NOTICE:
Do not over tighten gland nuts. Packing may set permanently and require removal. Over
tightened packing causes excessive friction between packing and sleeve, and will result in
damaged components. A noticeable temperature increase in stuffing box would indicate
insufficient lubrication.
Operate pump for at least 15 minutes before tightening gland nuts. Make small, even gland
nut adjustments to reduce leakage. Allow adequate run-in time between adjustments.
Acceptable leakage is 30-50 drops per minute.
Normal shaft run-out should be under 0.127mm | .005" to avoid pounding of stuffing box
packing. With excessive shaft run-out, shaft straightening or replacement is necessary.
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.
Operation
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