KSB CHTRa, Инструкция по установке и эксплуатации

Страница: 92 / 116

7 Servicing/Maintenance
92 of 116
CHTRa
To facilitate the shrink fitting of the impeller wear rings onto the impeller neck or
impeller hub, lead-in chamfers have been machined into the inner edges of the
impeller wear rings 503.
Heating the impeller wear
ring
Heat the impeller wear ring to 150 °C in an oven to allow for uniform heating. Do
not use a torch as this may cause local re-tempering of the material.
ü Ensure that the ring seat on the impeller is free of nicks and burrs.
1. Heat impeller wear rings 503.01/503.02/503.11 as described.
2. Fit impeller wear rings 503.01/503.02/503.11 on the impeller landings and ensure
that the chamfer faces the impeller’s inner edge (the chamfer is not visible when
the rings are mounted). The impeller wear rings should abut the impeller
landing (axial impeller seat) without any clearance.
3. Allow the impeller wear rings to cool down.
4. Drill 3 safety threads M5×10 offset at 120° between wear ring and impeller
neck.
5. Secure impeller wear rings 503.01/503.02/503.11 using grub screws 904.
6. Secure the grub screws’ seat using punch marks.
7.4.3 Installing the impellers on the rotor
Heating the impellers for the assembly
Impellers must be heated for assembly.
When heating the impellers observe the following:
▪
A heat source providing constant heat transfer (e.g. oven or induction heat) must
be used for impeller heating.
▪
Heat the impeller until the temperature reaches approx. 190 °C to approx. 210 °C.
▪ Heat the impeller until the temperature reaches approx. 374 °F to approx. 410 °F.
ü It is recommended that the shaft’s run-out be checked.
ü
The dimensions of all impeller hub holes and outer shaft diameters have been
checked.
1. Insert impeller key 940 into the keyway of the shaft.
2. Heat impeller 230 as described.
3. Slide impeller 230 onto shaft 210 so that it sits behind the shaft groove viewed
from the shaft end.
CAUTION
Improper assembly/dismantling
Damage to thrust ring!
▷ Use a suitable tool to bend open the thrust ring until it can be pulled from the
shaft.
▷ Never bend the thrust ring excessively.
4. Slide thrust ring 501 onto shaft 210, ensuring that thrust ring 501 sits firmly in
the shaft groove without any clearance.
5. Pull impeller 230 towards the shaft end until it abuts thrust ring 501 without
any clearance.
6. Allow impeller 230 to cool down.
7. Slide casing wear ring 502 onto impeller 230.
8. Heat bearing sleeve 529.01 and slide onto shaft 210 from the drive end.
9. Slide interstage bush 541 onto shaft 210 from the non-drive end.
10. Repeat the assembly process for all further impellers.