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7 Servicing/Maintenance
7.6.6 Fitting the bellmouth
7.6.6.1 Fitting the bellmouth for pressure class A
112
502
Fig. 43: Impeller of pressure class A
ü Bellmouth 138 has been positioned on wooden supports on a level and solid
surface.
ü Suitable lifting equipment is provided.
ü The pump set has been completely pre-assembled.
ü A new casing wear ring 502 has been fitted in bellmouth 138.
1. Attach the lifting tackle to bail 571 and carefully pull the pump set upright.
2. Centre the pump set above bellmouth 138.
Note: Make sure that the pin of bail 571 for attaching the lifting tackle and the
baffles in bellmouth 138 are aligned in the same direction.
3. Slowly lower the pump set. While lowering the pump set, make sure that studs
920.01 are aligned with the drilled holes.
4. Then lower the pump set until it sits on bellmouth 138.
5. Fasten all studs 902.01 with corresponding nuts 920.01 and discs 550.01.
Observe the tightening torque! (ð Section 7.8, Page 75)
6. Close the threaded holes with screw plugs 903.05.
Table 22: Diameter of the casing wear ring [mm]
Size
500 - 270
600 - 350
7.6.6.2 Fitting the bellmouth for pressure class B
At impellers of pressure class B, the outer contour of the vanes and the inner contour
of the casing wear are spherical.
For this pressure class the clearance gap is adjusted axially with the impeller nut.
Amacan P
903.05
920.01
550.01
138
Nominal diameter
270 + 0,1
350 + 0,1
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