Xylem IM157 Model MPVN - Manual (Page 10)

10
29. Relief fittings insufficient
• clean balance in impeller
• replace worn parts (impeller, split rings)
• adjust in line with the system pressure/intake
pressure given on ordering
30. System-related vibrations (resonance)
• seek assistance
31. Flow indicator wrong
• check flowmeter
• get rid of blockages
• put flowmeter in suitable place (no flow distortion
or burbling)
8. REPAIRS
Repairs to the pump or pump system may only
be carried out by authorized skilled personnel
or by the distributor’s specialist staff.
Trained Customer Service engineers are available to
assist with installation and repair work on request. When
removing the pump, you must comply with Point 1.4
“Safety Instructions”, Point 3.1 “Transport, Handling”
and Point 4.8 “Dismantling”.
9. SPARE PARTS, SPARE PUMPS
9.1 Spare Parts
Spare parts should be selected to last for two-years
continuous operation. If no other guidelines are
applicable, we recommend that you stock the number of
parts listed below.
Number of Pumps (including stand-by pumps)
2 3 4 5 6/7 8/9 10+
Spare Part Number of Spare Parts
Impeller i i i 2i 2i 3i 30%
Diffuser i/2 i/2 i/2 i i 3i/2 15%
Shaft with key and shaft screws/nuts 1 1 2 2 2 3 30%
Bearing (roller bearing) 1 1 2 2 2 3 30%
Shaft sleeve 2 2 2 3 3 4 50%
Joints for Pump Casing – sets 4 6 8 8 9 12 150%
Other joints†– sets 4 6 8 8 9 10 100%
Mechanical seal 2 3 4 5 6 7 90%
i = no. of stages
ATTENTION: TO ENSURE OPTIMUM
AVAILABILITY, WE RECOMMEND
THAT SUITABLE QUANTITIES OF
SPARE PARTS ARE HELD IN STOCK,
ESPECIALLY IF THESE ARE MADE
FROM SPECIAL MATERIALS AND IN
THE CASE OF MECHANICAL SEALS,
BECAUSE OF THE LONGER
DELIVERY TIMES.
Ordering Spare Parts
When ordering spare parts, please supply the following
information:
Pump Type:
Pump Order No.
Part Designation in sectional drawing
All the information is given in the Data Sheet and the
relevant sectional drawing.
9.2 Stand-By Pumps
It is essential that a sufficient number of stand-
by pumps are kept ready for use in plants where
failure of a pump could endanger human life or
cause damage to property or high costs. Regular
checks should be carried out to ensure that such pumps are
always ready for use (see Point 6.2).