CSF Inox CN 2, Instructions For Installation, Operation And Maintenance, Page: 9 / 16

pag. 9
10 SPARE PARTS
NUMBER OF PUMPS
(including reserve)
MECHANICAL SEAL
1
1
2
2
4
4
6
6
Denomination
RECOMMENDED SPARE PART FOR TWO YEARS OF OPERATION ACCORDING TO THE
NUMBER OF PUMPS INSTALLED - VDMA STANDARD
3
3
5
5
5
4
7
7
PUMP COVER O-RING SEAL
IMPELLER NUT " O-RING SEAL
2
2
3
3
C.S.F. Inox declines all responsibility for damage or injury resulting from the use of non-original
spare parts.
11 WORKING IRREGULARITIES
We are herewith listing some of the possible working irregularities which may occur using the pumps, with
a table helping to find out the possible causes and how to solve the problem.
Trouble:
A) The pump does not run
B) The delivery is not sufficient
C) The pressure is not sufficient
D) The pump stops priming
E) Power absorption too higher
F) Leakages from the mechanical seal
G) Short life of the mechanical seal
H) Failure of the mechanical seal
I) Anomalous vribarions and/or noise
L) Short life of bearings
Possible causes and necessary operations to solve them:
1) The pump is not properly primed.
- Repeat the priming.
2) Air entering from suction connections.
- Check the lock.
3) Air entering from the mechanical seal.
- Replace the mechanical seal or arrange a solution with a vacuum spring in case of vacuum suction
operation.
4) Obstructions present along suction pipes or valves closed along pipes.
- Verify and remove all foreign matters from pipes and finally verify valves status (if closed, open them).
5) NPSH available in the plant is lower than NPSH needed by the pump.
- Reduce the friction loss or adjust the pump at a lower delivery point.
6) Defective operation of the standing valve (not flooded pumps).
- Restore the proper operation of the valve or replace it with a perfect one.
7) Plant friction losses higher than pump performances.
- Reduce friction losses or replace the pump with a most suitable one for requested performances.
8) Opposite direction of rotation o too low velocity (in case of a pump operated by an inverter).
- Restore the correct sense of rotation; increase the motor speed.
9) The impeller is clogged by foreign matters (in case of pump with closed-impeller).
- Remove foreign matters from the impeller.
10) Weared mechanical seals.
- Replace weared parts.
11) Weared or partially clogged impeller.
- Replace the impeller or remove foreign matters.
12) Product viscosity higher than forseen one.
- Verify the pump size.
13) Presence of too much gas in the fluid.
- Fit an air relief valve.