KSB HPK-L, Installation & Operating Manual

Page: 17 / 74

4 Description of the Pump (Set)
17 of 74
HPK-L
1136.8/15-EN
4.5 Design details
Design
▪
Volute casing pump
▪ Horizontal installation
▪ Back pull-out design
▪ Single-stage
▪
Technical requirements to ISO 5199
▪ Dimensions and ratings to ISO 2858
complemented by pumps of nominal diameters DN 25, DN 200, DN 250 and
nominal impeller diameter 500 mm
Pump casing
Fig. 6: Pump feet, bottom
▪
Single or double volute, depending on the pump size
▪ Radially split volute casing
▪ Volute casing (with casing wear ring, if applicable) and casing cover
Impeller type
▪ Closed radial impeller with multiply curved vanes
▪ Back vanes reduce axial thrust.
Shaft seal
▪
Single, balanced standardised mechanical seal
– The seal chamber is located between the product-lubricated pump-end plain
bearing and the external, drive-end rolling element bearing.
Mechanical seal in "dead end" arrangement
1. Never use mechanical seals which have not been approved by KSB.
2. Due to the complex conditions which need to be fulfilled for heat transfer fluid
pumps, the use of mechanical seals not approved by KSB shall not be covered by
KSB's scope of warranty.
Fig. 7: Mechanical seal in "dead end" arrangement
The seal chamber is cooled by cooling fins and ambient cooling air.