5.5 Mechanical seal leaks
Occasional leaks
If the seal leaks slightly at start-up, allow a reasonable amount of time for the seal to adjust itself. Fluids
with good lubricating qualities normally take longer to adjust than fluids with lesser lubricating qualities.
When a seal starts out with a slight leak and the leak decreases while running, it indicates leaks across
the seal faces. Run the pump continuously in order to eliminate this issue.
Continuous leaks
When immediate leaks occur and remain constant, even during operation, it usually indicates either sec-
ondary seal damage, or seal faces that are warped or cracked. See Troubleshooting for probable caus-
es.
5.6 Shut down the pump
WARNING:
Precautions must be taken to prevent physical injury. The pump may handle hazardous and/or
toxic fluids. Proper personal protective equipment should be worn. Pumpage must be handled
and disposed of in conformance with applicable environmental regulations.
1.
Slowly close the discharge valve.
2.
Shut down and lock out the driver to prevent accidental rotation.
3.
If the driver is not equipped with a non-reverse ratchet (NRR), be certain that the unit is completely
stopped before you restart the pump.
4.
On pump sets with double mechanical seal, apply the required pressure specified in the mechanical
seal documentation to the mechanical seal chamber also during standstill.
5.
Ensure quench liquid supply is on during pump standstill.
5.7 Lubricate the thrust pot during a shutdown period
1.
Completely immerse the bearings in oil.
This helps to avoid oxidation of the anti-friction bearings during shutdown periods lasting longer
than one week.
2.
Fill the oil reservoir until the oil runs over the oil retainer tube and down the shaft.
Before startup, drain the oil to its required level.
5.5 Mechanical seal leaks
Model VICR Installation, Operation, and Maintenance Manual
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