The minimum pressure required at the suction port of the pump to keep the pump from cavitating. Here we can calculate for net positive suction head and cavitation. The absolute pressure at the suction port of the pump. The npsh name itself, an acronym, confuses most pump neophytes. Net positive suction head by defining, identifying, and quantifying the concept. Npsh net positive suction head engineering toolbox. Net positive suction head calculator npsh calculator. Npsh required npshr is the amount of fluid that a pump will require at a certain operating point. Available npsh calculation npsha is important for deciding the line sizes on suction side of a centrifugal pump. Npsh available npsha is the amount of fluid that a system can deliver to the pump. Calculate the npsh available and check with respect to the npsh required. Npsh of pump units and pumping systems i n f o r m a t i o n information npsh e 08 2010 all details as stated in this document comply with the technical standard that is applicable at the date of printing. Npsh a is a function of your system and must be calculated, whereas npsh.
Cameron included in this example or you can calculate the loss using the darcyweisbach equation with the moody diagram or the colebrook or swameejain equation. Npsh net positive suction head m, in available npsh npsh a or npsha. The subject and required calculations confounds people who are new to the industry, those on the periphery operators or administrators and professionals who incorrectly believe they fully understand the subject even after 25 years in the business. The net positive suction head available from the application to the suction side of a pump is often named npsh a. I n f o r m a t i o n npsh of pump units and pumping systems. Net positive suction head npsh npsh can be defined as two parts.
Code to add this calci to your website just copy and paste the below code to your webpage where you want to display this calculator. Net positive suction head and cavitation calculator. Sample problem npsha calculation for pumps enggcyclopedia. These details are subject to technical innovations and modifications at any time.