CPK pumps are horizontal, radially split single stage, single entry , back pullout type, volute casing process pumps with radial flow impeller, to EN 22858 / ISO 2858 / ISO 5199. Complemented by pumps of DN 200 and above.
CPK pumps are used for pumping hot water and organic and inorganic fluids in chemical, food and other branches of industries. The application areas are Chemical, Refinery, Paper & Pulp Industries, Food Industries, Sugar Industries etc.
Material of wetted parts can be :
Additional designations can be :
Suffix can be :
1. Capacity and total head
2. Differential head
The NPSH values given in the individual performance curves are the minimum values which corresponds to the cavitation limits. They are valid for water without gases. As a safety margin, committed NPSHr values must therefore be higher than that on the curve by atleast 0.5m.
In general (NPSHa-NPSHr) should be > 0.5m, and for hot water should be >1m.
The values given in the individual curves are measured values based on 3% pressure drop.
For Q< 0.3Qopt. (where Qopt. corresponds to flow at the best efficiency point) measurement of NPSH is difficult. The values given in the NPSH curves can be fully considered. NPSH testing for Q < Qopt. Is however is not possible.
Selection of Pump
Fig. 1 shows the family curves for nominal speed at 50Hz of supply frequency. Initial selection of the pump is to be done from these curves. If the required operating speed is different from the nominal speed, then the operating parameters should be converted to the nominal speed and then the selection is to be done. The pump models shown in dotted lines are not yet developed in KSB India.