Multitec
N.B.: The advantage of the deep-drawn discs is their hardness
at the sealing gap due the forming procedure during production.
Deep-drawn parts are much harder than machined parts, which
places the deep-drawn components at a considerable advantage
in the event of the impeller coming into rubbing contact during
pump operation. This feature is of particular importance for pumps
with stainless steel impellers.
Should repair method c) be applied, the clearance gaps have to
be increase by approx. 0.1 mm as against the original clearance
gaps.
Fig. 7.5-3
Installation and Re-commissioning
Please refer to the appropriate sections of these operating
instructions.
Clearance gaps between impeller 230 and diffuser :
a) Re-working the impellers at the sealing gaps of the hubs.
Re-working the diffusers and installing a casing wear ring to
ZN 140.
b) Should hub thickness be insufficient after re-working, replace
the impeller or install a spacer sleeve (see drawing below).
The spacer sleeve must be driven by the impeller key.
Attention should be given that the carrying key length in the
impeller is at least 2/3 of the total (carrying) key length.
Fig. 7.5-1
Fig. 7.5-2
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