Xylem MPAI - Manual (Page 99)

Installation, Operating and Maintenance Instruction
Model MP, MPA, MPAI
MP 100-english page 95 Revision 04
Article No 771074011 Issue 11/2011
9.3 Model MP (bearings on both sides)
See "Appendix" in Operating Instructions for sectional
drawing.
All parts must be cleaned, free of grease and prepared
in accordance with Point 9.1.
Clamp the shaft in a vertical position (24) (use soft
protective wedges), with coupling stub pointing
upwards.
Other assembly work depends on the type of shaft
seal, see Points 4.1 to 4.3, Section Assembly.
Attention: In contrast to the description in Points
4.1 to 4.3, the casing of the shaft seal is exposed.
Proceed carefully in order to avoid damage to the
mechanical seal (GLRD).
Preheat bearing (K1) (max. 80°C) and slide onto
the shaft (24).
Variants: MP, MPA 40 and 65 ........roller bearing
(K1) – double row angular ball bearings
(single bearings)
MP, MPA 100 and 125 ....roller bearing
(K1) – paired angular ball bearings in X
arrangement
Paired angular ball bearings in X arrangement
Tighten shaft nut (50) while the bearing is still hot.
Fill approx. 60% of the space in the roller bearing
(K1) with grease (when the bearing has cooled
down)
Mount bearing flange (10), at the same time insert
shaft seal casing (18 and 19).
Screw bearing cap (12) to bearing flange (10).
Grease the counter contact surface of the splash
ring packing on the bearing cap (12).
Bring the splash ring (73) into position (groove in
the spacer sleeve) (72).
Lay pressure casing (4) horizontally so that the
shaft can be inserted (24) (mounting plate with
borehole or assembling trestle)
Place pre-mounted unit on the pressure casing (4)
and tighten nuts (M2) (see Supplementary Sheet
for torque)
Rotate shaft (24) to see that it runs smoothly.
The pump must be turned around for further
assembly work (free shaft pointing upwards
vertically)
Assembly as for dismantling.
Lubricate shaft (24)
Check position of the impeller: Insert diffuser
(2/E), slide impeller (1) until impact.
The impeller is in the correct position when the
impeller outlet channel lies within the diffuser
intake channel
(avoids impact losses). Corrections can be carried
out by adding compensation disks or by turning off
the impeller hub on the rear side. This check must
be carried out at every stage.
If a pump is assembled with new impellers, care
must be taken that the first and last stage is
always provided with an impeller with the full blade
diameter. If only one impeller is available with the
full blade diameter it must be used as the first
stage.
Please note that assembly work always starts
with the final stage.
Remove impeller and diffuser once more, insert
O-ring (OR2), re-insert diffuser (2/E).
Insert feather key (PF1 or PF2) for the impeller
that is to be mounted.
Mount impeller (1) (as the O-ring (OR2) presses
on the diffuser (2/E) the setting will not be correct
at first.
Generously grease O-ring (OR1) with silicon
grease and stage casing (60). Do not twist O-ring.
Place stage casing (60) on level and force down
sharply. Hit with a plastic hammer until it impacts.
Assemble pump down to the suction casing (3)
Slide on sleeve (38), mount suction casing (3) with
O-ring (OR1), take care that the lines are in the
correct position.
Further assembly work depends on the type of the
shaft seal. See Point 4.1 to 4.3 Section Assembly
"Assemble" bearings according to Point 3 (Replacing
Roller Bearings).
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).
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.
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%