Xylem MPV - Manual (Page 97)

Installation, Operating and Maintenance Instruction
Model MPB, MPV
MPB 100-english page 93 Revision 02
Article No 771074115 Issue 01/2010
Lubricate the shaft (24)
Inspecting the impeller setting: Insert the diffuser
(2/E), slide on the impeller (1) up to the stop.
The impeller setting is correct if the impeller
discharge channel lies within the diffuser intake
channel
(Avoids loss due to impacts). A correction can be
performed by adding compensating washers or by
turning the impeller hub on the rear side to move it
outward. This inspection must be performed for
every stage.
If a pump is assembled with new impellers, it is
important that the first and last stage always
receive an impeller with a complete blade
diameter. If only one impeller with a complete
blade diameter is available, this should be used as
the first stage.
Please note that assembly work always starts
with the final stage.
Remove the impeller and diffuser again, insert the
O-ring (OR2), insert the diffuser again (2/E).
Insert the key (PF1 or PF2) for the impeller to be
installed.
Install the impeller (1) (because the O-ring (OR2)
presses against the diffuser (2/E), the setting will
initially be incorrect).
Lubricate the O-ring (OR1) well with silicone
grease and slide it onto the stage casing (60).
While doing so, do not twist the O-ring into itself.
Lay on the stage casing (60) flat and press it down
in jolts. Pound it down to the stop with a plastic
hammer.
Assemble the pump down to the inner bearing
casing (54).
Slide on the bearing sleeve (23), coat the running
surface with a lubricant
Mount the inner bearing casing (54) with the
bearing bush (21) like the stage casing
Mount the first stage of the pump, secure the
impeller (1) with washer (23) and nuts (28).
Tighten the first nut (28), then turn it back approx.
1/4 turn, secure with the locknut.
Mount the suction casing (3) with O-ring (OR1),
lightly press together the pump with casing anchor
(25) using the nuts (M1).
Align the resting surface of the pump feet (place
the pump on a flat surface).
Tighten the nuts (M1), see the table in the
appendix for the tightening torque.
Turn the shaft (24) and check for easy motion.
10. Spare Parts, Spare Pumps
10.1 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 (in accordance with DIN 24296).
Number of pumps (incl. stand-by pumps)
2 3 4 5 6/7 8/9 10/+
Spare Parts Number of spare parts
Impeller i i i 2i 2i 3i 30%
Diffuser i/2 i/2 i/2 i i 3i/2 15%
Wear ring-casing 2i 2i 2i 4i 4i 6i 30%
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%
Packing rings 16 16 24 24 24 32 40%
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 = number of stages
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:
Type:
______________________________________________________________________
S/N (Order No.):
_ ___________________________________________________
Part name:
_____________________________________________________________
Sectional Drawing
__________________________________________________
All the information is given in the data sheet and the
relevant sectional drawing.
Store spare parts in dry and clean rooms!
10.2 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
chapter 6.8).
Store stand-by pumps according to chapter 6.8.
11. Faults - Causes and Solutions
The following notes on causes of faults and how to
repair them are intended as an aid to recognising the problem. The manufacturer's Customer Service
Department is available to help repair faults that the