18
Adjustment of Impeller Center Position
After completion of the assembly the
impeller must be in the centre of the pump volute. This position is achieved with the
aid of the sleeve nuts (part 921). After adjustment the sleeve nuts are firmely
tightened on both sides and secured with keys and circlips. Tthe radial clearances
between the impeller and casing wear ring (part 234 and 503) have to be checked.
Locating of the Pump Casing Upper Half ;
Prior to locating the pump casing
upper half (part 105.02) the casing gasket plate (part 400.01) must be checked. It
must be undamaged and clean, and its shape must conform to that of the pump
casing. Any gaps must be eliminated, particularly in the areas where the gasket
plate is in contact with other sealing areas, as gaps would lead to leakage within the
pump casing (casing wear rings and neck bushes).For the same reason and this
applies in particular to pumps with mechanical seal the front faces of the gasket
plates are cut to size after the pump casing upper half has been screwed on to
ensure that leakages are prevented on the gaskets of the mechanical seal covers.
Generally compressed asbestos fiber gasket of 1.0 mm thickness will be provided
as gasket plate.
Recommended Spare Parts
Spare parts should already be in stock at the client‟s
for the initial startup. In order to minimize down-time we recommend to obtain one
complete set of spare parts like rotor assembly, wear rings, bearings, mech. Seals
and Stuffing box packing for normal operation of several pumps of the same size
we recommend a minimum storage according to VDMA
– rule 24 296, sheet 1.The
following VDMA instructions have been based on a 2 years, continuous operation
Spare parts
Number of pumps
(include Stand-by pumps)
2
3
4
5
6 & 7
8 & 9
10 & more
Number of Spare Parts
Impeller
1
1
1
2
2
3
30%
Case Wear ring
2
2
2
3
3
4
50%
Impeller wear ring
2
2
2
3
3
4
50%
Shaft with key & shaft screws or
nuts
1
1
2
2
2
3
30%
Bearings
1
1
2
2
3
4
50%
Shaft Protecting sleeve
2
2
2
3
3
4
50%
Thrower
1
1
2
2
2
3
30%
Packing rings
16
16
24
24
24
32
40%
Gaskets for pump casing sets:
4
6
8
8
9
12
150%
Other gaskets sets:
4
6
8
8
9
10
100%
Содержание ZM 375/00
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