Goulds Pumps VIT - IOM - Manual (Page 69)

Symptom Cause Remedy
The mechanical seal leaks. The seal faces are not flat due to the gland
bolts being too tight, causing warpage of
the gland and insert.
Remove the gland bolts and then reinstall them
properly.
The shaft packing has been chipped during
installation.
Replace the packing.
One of these conditions exists:
• The carbon insert is cracked.
• The insert face or seal ring was chipped
during installation.
Remove the mechanical seal, inspect, and
replace as necessary.
The seal faces are scored from foreign
particles between the faces.
Install a strainer, and then filter or cyclone the
separator as required to filter out any foreign
particles.
The seal squeals during operation. There is an inadequate amount of liquid at
the seal faces.
A bypass flush line is necessary. If a bypass line
is already in use, then enlarge it to produce
more flow.
Carbon dust is accumulating on the
outside of the gland ring.
There is an inadequate amount of liquid at
the seal faces.
Bypass the flush line. If a bypass line is already
in use, then enlarge it to produce more flow.
Liquid film is flashing and evaporating
between the seal faces and leaving residue,
which is grinding away the carbon.
Consult an ITT representative.
The seal leaks but nothing appears
to be wrong.
The seal faces are not flat. Relap or replace the seal faces.
The seal is wearing out too quickly. Product is abrasive, causing excessive seal
face wear.
Determine the source of the abrasives and
install a bypass flushing to prevent abrasives
from accumulating in the seal area. Install a
cyclone separator as necessary.
Abrasives are forming due to the process
liquid cooling and crystallizing or partially
solidifying in the seal area.
Install a bypass flush line to hold the liquid
temperature around the seal above the
crystallization point.
The seal is running too hot. Check for possible rubbing of the seal
components. Recirculation or a bypass line
may be necessary.
The wrong kind of seal was used. Consult an ITT representative.
Troubleshooting (Continued)
Model VIT Installation, Operation, and Maintenance 67