43
7.2.2.1 Checking the coupling
Check the flexible elements of the coupling. Replace these parts in due time if there is any
sign of wear.
7.2.2.2 Checking the clearance gaps
Remove the back pull-out unit to be able to check the clearance gaps. ( Section 7.4.4 Page
48)
If the clearance gap is larger than permitted (see the following table), replace casing wear
ring 502 with a new one.
The clearances given refer to the diameter.
7.2.2.3 Cleaning filters
These values are valid for temperatures up to 250 °C; for temperatures higher than 250 ° the
clearance is increased by 0.1 to 0.2 mm
7.2.2 Inspection work
DANG E R
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.
Nominal diameter of the
discharge nozzle
up to DN 65
0.40 mm
+ 0.1
0.60 mm
+ 0.1
DN 80 to DN 200
0.5 mm
+ 0.1
0.60 mm
+ 0.1
DN 250 and above
0.65 mm
+ 0.1
0.75 mm
+ 0.1
Material 1 *
*
Material 2
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 PUMPIRAN.
NOTE
C AUTION
Insufficient inlet pressure due to clogged filter in the suction line
Damage to the pump!
Monitor contamination of filter with suitable means (e.g. differential pressure
gauge).
Clean filter in appropriate intervals.
7 Servicing/Maintenance
Table 19: Clearances between impeller and casing / between impeller and casing wear ring
*) Please contact PUMPIRAN.
