Symptom
Cause
Remedy
The wrong grade of packing was used. Consult an ITT representative.
The stuffing box was improperly
packed.
Repack the stuffing box.
The packing wears out too fast. The shaft or shaft sleeve is worn or
scored.
Remachine or replace any parts as nec-
essary.
There is insufficient leakage across the
packing.
Repack the stuffing box and make sure
that the packing is loose enough to allow
some leakage.
The stuffing box was improperly
packed.
Repack the stuffing box properly, making
sure that all old packing is removed and
the stuffing box is clean.
The wrong grade of packing was used. Consult an ITT representative.
The seal leaks.
The seal faces are not flat because the
gland bolts are too tight. This causes
the gland and insert to warp.
Remove the gland bolts and then reinstall
them properly.
The gasket 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 in order to filter
out any foreign particles.
The seal squeals during opera-
tion.
There is an inadequate amount of liq-
uid at the seal faces.
A bypass flush line is necessary. If a by-
pass line is already in use, then enlarge it
in order to produce more flow.
Carbon dust is accumulating on
the outside of the gland ring.
There is an inadequate amount of liq-
uid 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 ap-
pears to be wrong.
The seal faces are not flat.
Relap or replace the seal faces.
The seal is wearing out too
quickly.
This product is abrasive. This causes
excessive seal face wear.
Determine the source of the abrasives
and install a bypass flushing in order to
prevent abrasives from accumulating in
the seal area. Install a cyclone separator
as necessary.
Abrasives are forming due to the proc-
ess liquid cooling and crystallizing or
partially solidifying in the seal area.
Install a bypass flush line in order 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.
7.1 Operation troubleshooting
62
Model VCW Installation, Operation, and Maintenance
Summary of Contents for Goulds Pumps VCW
Page 1: ...Installation Operation and Maintenance Model VCW ...
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