Selection and sizing
CR, CRN 95-155
4
15
As the pump is sized on the basis of the highest
possible flow rate, it is important always to have the
duty point to the right on the efficiency curve (eta) in
order to keep the efficiency high when the flow rate
drops.
Fig. 9 Best efficiency
Fig. 10 Sizing data
Pump material
Select the material variant on the basis of the liquid to
be pumped.
The product range covers the following three basic
types.
•CR
Use CR, CRI pumps for clean, non-aggressive
liquids, such as potable water and oils.
• CRN
Use CRN pumps for industrial liquids and acids.
See List of pumped liquids on page 31, or contact
Grundfos.
Pump connections
Selection of pump connection depends on the rated
pressure and the pipes. To meet any requirement, the
CR, CRN pumps offer a wide range of flexible
connections, such as:
• ANSI flange
• DIN flange
• PJE coupling (Victaulic type)
• other connections on request.
Shaft seal
Fig. 11 Shaft seal (cartridge type)
As standard, the CR range is fitted with a Grundfos
shaft seal (cartridge type) suitable for the most
common applications.
These key parameters must be taken into account
when selecting the shaft seal:
• type of pumped liquid
• liquid temperature
• maximum pressure.
We offer a wide range of shaft seal variants to meet
specific demands. See List of pumped liquids, page
31.
Servicing shaft seals
Replacement shaft seals are available as complete
service kits*.
Shaft seals fitted on CR, CRN 95-155 pumps with ∅28
mm or ∅36 mm shaft ends are serviceable. This
means that the wear parts in these shaft seals are
available as service kits* and can be replaced without
having to renew the complete shaft seal.
* All service kits include detailed instructions on how to carry out the
replacement.
TM00 9190 1303
TM02 6711 1403
NPSH
H
geo
H
f
Required flow, required
pressure
GR7386
To Next Page
Loading...
