16
Impeller type
. Closed radial impeller with multiply curved vanes
. Back vanes reduce axial thrust
Shaft seal
. Stuffing box packing
. Commercial single and double acting mechanical seals
Preferable:
. Standardised mechanical seals to EN 12756 variant K
Possible:
. Commercial cartridge seals
Alternative:
. Version without shaft protecting sleeve with
,,
wet shaft
,,
Table 6: Seal chamber with different shaft seals (examples)
Bearings
Motor-end bearing:
. Fixed bearing
. Paired angular contact ball bearing
. Axial movement of the rotor limited to maximum 0.5 mm
. Oil lubrication
.
Optional: grease lubrication
Conversion from stuffing box packing to mechanical seal and vice versa is possible without any
rework on the casing cover by using the relevant replacement parts.
I
ll
ustration
Type of seal
Cylindrical seal chamber
Standardised mechanical seal
Double-acting mechanical seal
(back-to-back)
both sides unbalanced
4 Description of the Pump (Set)
Design specifications