KSB Vitastage, Инструкция по установке и эксплуатации

Страница: 36 / 44

8 Trouble-shooting
36 of 44
Vitastage
8 Trouble-shooting
WARNING
Improper work to remedy faults
Risk of injury!
▷ For any work performed to remedy faults, observe the relevant information
given in this operating manual and/or in the product literature provided by the
accessories manufacturer.
If problems occur that are not described in the following table, consultation with the
KSB
customer service is required.
A
Pump is running, but does not deliver
B
Insufficient flow rate
C
Discharge pressure below specified value
D
Pump does not withdraw any fluid (pump takes in air)
E
Excessive power input
F
Leakage at mechanical seal.
G
Mechanical seal life too short
H
Mechanical seal damaged
I
Unusual vibrations and/or noises
J
Motor is overloaded
Table 16: Trouble-shooting
A B C D E F G H I J Possible cause Remedy 4)
✘ ✘ - - - - - - - - Pump not primed sufficiently Prime pump and check suction-side
conditions. Repeat pump start-up.
✘ ✘ - ✘ - - - - - - Pump takes in air. Check entire piping. Seal it if required.
✘ ✘
-
✘
- - - - - - In suction lift operation, air enters via
mechanical seal.
Replace mechanical seal or use seal with
reinforced spring.
✘ ✘
-
✘
- - - - - - Clogged suction line or valves in piping
closed/not opened enough
Check suction line, remove any foreign
matter and check all valves.
✘ ✘
-
✘
- - - - - - NPSHavailable smaller than pump's
NPSHrequired.
Improve suction and flow conditions.
Reduce flow rate with discharge-side
control valve.
✘ ✘
- - - - - - - - Suction-side foot valve does not close
properly and liquid column drops.
Repair or replace foot valve.
✘ ✘ ✘
- - - - - - - Flow losses in system exceed specified
discharge head of pump.
Reduce pipe friction losses, fit larger
impeller (observe motor rating) or select
different pump which is suitable for the
new duty point.
✘ ✘ ✘ - - - - - - - Wrong direction of rotation or speed
too low (operation on a frequency
inverter)
Check and correct the direction of
rotation or increase speed (observe
motor rating).
✘ ✘ ✘ - ✘ - - - - - Impeller clogged by foreign matter (on
pumps with closed impeller).
Remove foreign matter, clean impeller
if required.
- ✘ ✘ - - ✘ - - - - Excessive wear of mechanical seal Replace complete mechanical seal.
- ✘ ✘ - - - - - ✘ - Excessive wear of impeller or clogged
impeller
Replace impeller or remove foreign
matter.
- ✘ ✘ - - - - - - ✘ Fluid viscosity higher than expected Verify suitability of pump selected.
- -
✘ ✘
- - - - - - Excessive gas content in fluid Use vent valve.
- - - ✘ - - - - - - Flow losses in system lower than
specified discharge head of pump
Reduce flow rate with discharge-side
control valve, reduce impeller diameter
or fit orifice plate.
4)
Pump pressure must be released before attempting to remedy faults on parts which are subjected to pressure.