7 Servicing/Maintenance
53 of 80
HPK
1121.8/06-EN
NOTE
After commissioning, increased temperatures may occur at grease-lubricated rolling
element bearings due to the running-in process. The final bearing temperature is
only reached after a certain period of operation (up to 48 hours depending on the
conditions).
7.2.2 Inspection work
DANGER
Excessive temperatures caused by friction, impact or frictional sparks
Explosion hazard!
Fire hazard!
Damage to the pump set!
▷ Regularly check the coupling guard, plastic components and other guards of
rotating parts for deformation and sufficient distance from rotating parts.
DANGER
Electrostatic charging due to insufficient potential equalisation
Explosion hazard!
▷ Make sure that the connection between pump and baseplate is electrically
conductive.
7.2.2.1 Checking the coupling
Check the flexible elements of the coupling. Replace the relevant parts in due time if
there is any sign of wear and check the alignment.
7.2.2.2 Checking the clearances
To check the clearance gaps, remove the back pull-out unit.
(ðSection7.4.4,Page57)
If the clearance gap is larger than permitted (see the following table), fit a new
casing wear ring 502.01.
The clearance gaps specified refer to the diameter.
Table21: Clearances between impeller and casing/between impeller and casing wear
ring
HPKS/SX/SY HPKE/EX/EY
Up to and including DN 65 0.40 mm + 0.1 0.60 mm + 0.1
DN 80 to DN 200 0.50 mm + 0.1 0.60 mm + 0.1
DN 250 and above 0.65 mm + 0.1 0.75 mm + 0.1
These values are valid for temperatures up to 250°C; for temperatures higher than
250°C the clearance is increased by 0.1 to 0.2 mm.
HPKS/SY models are always fitted with casing wear rings.
For HPKE/EY models, casing wear rings are only available as a variant.
NOTE
If the clearances given are exceeded by more than 1 mm (referring to the diameter)
replace the affected components or restore the original clearance by means of a
casing wear ring.
Contact KSB.
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