8 Parts Listings and Cross-sectional
Drawings
8.1 Recommended spare parts
Select spare parts that will last for two years of continuous operation. If no other guidelines are applica-
ble, stock the number of parts listed in this table.
Spare part
Number of pumps (includes stand-by pumps)
2
3
4
5
6/7
8/9
10 or more
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%
Ball bearing
1
1
2
2
2
3
30%
Bearing shaft nut (2 for radial suction)
2
3
4
5
6
8
90%
Shaft sleeve
2
2
2
3
3
4
50%
O-rings for pump casing sets
4
6
8
8
9
12
150%
Other O-ring sets
4
6
8
8
9
10
100%
Mechanical seal (sets for radial suction) 2
3
4
5
6
7
90%
i = Number of stages
8 Parts Listings and Cross-sectional Drawings
Model 3355 Installation, Operation, and Maintenance Manual
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