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1.4.2 Pump Face Options
The NPSH Optimized Pump Face is designed to increase the efficiency of the pump face during either
suction or discharge. During suction, the product has to transition from the cross-sectional area of a 4"
OD tube (or smaller) to a cross-sectional area of the pump housing. By the mass flow rate equation and
Bernoulli's equation, respectively:
The above equations imply that:
That is, that as the product goes from the smaller inlet to the larger pump housing, the velocity decreases
thus the pressure increases. This increased pressure results in a higher NPSHa, thus increasing the pump's
capabilities. The NPSH Optimized Pump Face also comes with a G1" sanitary port to add a pressure sensor
to see the process in action.
Another factor considered in the NPSH design is smooth flow transition. Sudden changes in diameter
rapidly increase the Reynolds number of the flow, which can create turbulent flow that will both decrease
the pump efficiency and could damage sensitive product. The NPSH pump face addresses these concerns
by using a diverging nozzle to expand the flow evenly, avoiding sharp corners and sudden changes to the
flow characteristics.
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1. ABOUT VISCOTWIN SCREW PUMPS
is always on the lookout for new ways to innovate pro-
Processtec
ducts in our Industry, and so we are proud to announce the NPSH
Optimized Pump Face. It was designed to transition pumped product
more efficiently and gently between the pump face and the pump
housing. This design helps in many ways: it keeps the product whole
and intact, it eliminates cavitation, and gives the customer more op-
tions for piping configurations.
The Dual Port Pump Face uses the same principle as the NPSH
pump face. This configuration allows for two lines to conjoin at the
pump which reduces piping system complexity, while maintaining
the efficiency of the NPSH standard pump face.
PROCESSTEC INC. 2022
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