The cavitation allowance (NPSHr) of horizontal foam pump is a key parameter, which directly affects the performance and life of the pump. However, as horizontal foam pumps may have different designs and applications, their specific cavitation allowance may vary.

Generally speaking, cavitation allowance refers to the excess energy per unit weight of liquid at the pump inlet that exceeds the vaporization pressure, usually expressed in meters (water column). In horizontal centrifugal pumps, cavitation allowance is one of the key factors affecting their performance, as cavitation may lead to a decrease in pump efficiency, shortened lifespan, and even pump failure in severe cases.

For the horizontal foam pump, the specific value of its cavitation allowance needs to be determined according to the pump design, service conditions and the characteristics of the transmission medium. Usually, manufacturers will provide necessary NPSHr information on the product sample or characteristic curve of the pump for user reference.