6.3 Shaft-seal maintenance
6.3.1 Mechanical-seal maintenance
WARNING:
The mechanical seal used in an Ex-classified environment must be properly certified.
CAUTION:
Running a mechanical seal dry, even for a few seconds, can cause seal failure and physical
injury. Never operate the pump without liquid supplied to the mechanical seal.
Cartridge-type mechanical seals
Cartridge-type mechanical seals are commonly used. Cartridge seals are preset by the seal manufactur-
er and require no field settings. Cartridge seals installed by the user require disengagement of the hold-
ing clips prior to operation, allowing the seal to slide into place. If the seal has been installed in the pump
by ITT, these clips have already been disengaged.
Other mechanical seal types
For other types of mechanical seals, refer to the instructions provided by the seal manufacturer for instal-
lation and setting.
Reference drawing
The manufacturer supplies a reference drawing with the data package. Keep this drawing for future use
when you perform maintenance and seal adjustments. The seal drawing specifies the required flush fluid
and attachment points.
Before you start the pump
Check the seal and all flush piping.
Mechanical seal life
The life of a mechanical seal depends on the cleanliness of the pumped fluid. Due to the diversity of op-
erating conditions, it is not possible to give definite indications as to the life of a mechanical seal.
6.3.2 Packed stuffing-box maintenance
WARNING:
•
Failure to disconnect and lock out driver power may result in serious physical injury. Nev-
er attempt to replace the packing until the driver is properly locked out.
Accepted leakage rate
It is not necessary to shut down or disassemble the pump to inspect the packing operation. During nor-
mal operation, the packing should leak approximately one drop per second.
Adjustment of gland
Adjust the gland if the leakage rate is greater than or less than the specified rate.
6.3 Shaft-seal maintenance
Models 3180, 3181, 3185, and 3186 Installation, Operation, and Maintenance Manual
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