Abstract
According to the Bernoulli equation, it is possible to determine the total relative head at the pump inlet by measuring the total relative head at another point in the system, upstream from the pump, and by deducting the total head losses between this point and the pump inlet. System designers make the determination of available net positive suction head (NPSHA). It must be carefully calculated and communicated to the pump manufacturer in order to select the most suitable pump. This chapter lists the points that can be misinterpreted during the process: atmospheric pressure, reference level, temperature and vapor pressure, and velocity head. Since net positive suction head (NPSH) is the margin or the difference between the actual static pressure and the vapor pressure, these must be brought to the same form if an incorrect—usually unnecessarily low—value of NPSHA is to be avoided. Because NPSHA is usually referred to the level of the inlet connection, which may be different from that of the NPSH reference plane, an eventual correction of the level must be applied when comparing NPSHA and NPSHR, or when correcting for rotational speed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Net Positive Suction Head for Rotodynamic Pumps: A Reference Guide
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
