A B C D E
F
G H I
J
Possible cause
Remedy
4)
X X X
Fluid or fluid temperature unsuitable for
mechanical seal materials used
Select type and material of mechanical seal
as required.
X X X
Pump not cleaned sufficiently after it was
used for fluids that tend to crystallise
Drain fluid immediately after pump
operation and perform several cleaning
cycles.
X X
Mechanical seal installed incorrectly
Re-install mechanical seal correctly.
X
Incorrect direction of rotation of pump with
non-reversible mechanical seal
Reverse direction of rotation
X X
Dry running of pump
Monitor pump and system (flow meter,
pressure gauge) to prevent dry running.
X
Fluid contains solids.
Select type and material of mechanical seal
as required.
X
Excessive fluid temperature or thermal shock Observe permissible temperature limits,
increase fluid temperature slowly and
prevent abrupt temperature changes.
X
Impeller out of balance
Foreign matter in the impeller, replace
impeller (if required).
X
Flow rate too low
Open discharge-side control valve further to
reduce flow losses in discharge line.
X
Pump and piping system secured
insufficiently
Check anchoring of pump or pump set.
Support and fasten piping sufficiently, use
expansion joints, if required.
X Speed is too high.
Reduce speed.
X
X X Motor running on two phases only.
Replace the defective fuse.
Check electrical connections.
4)
Pump pressure must be released before attempting to remedy faults on parts which are subjected to pressure.
8 Trouble-shooting
36 of 44
Vitastage
