What is NPSH? - Pumps & Systems
Dec 17, 2011 · NPSH stands for Net Positive Suction Head, the margin of pressure over vapor pressure at the pump suction nozzle. Learn how to calculate NPSH for centrifugal and displacement pumps, and how it affects pump performance and cavitation.
NPSH Calculation: A Step-by-Step Guide - Pumps & Systems
Jul 11, 2018 · Learn the definition and formula of NPSH (net positive suction head), NPSHa (available NPSH) and NPSHr (required NPSH) for centrifugal pumps. See examples of how to calculate NPSHa for different suction system configurations and conditions.
Learn how to calculate and optimize net positive suction head (NPSH) for centrifugal and displacement pumps, and how to avoid cavitation damage. This e-book from Pumps & Systems magazine covers NPSH definitions, formulas, units, instruments, and examples.
Performance Curves and NPSH Tests - Pumps & Systems
Dec 17, 2011 · Figure 3 shows all parameters in the same fashion except for NPSH. Instead of a single curve that applies to all impeller diameters, lines of "iso‑NPSH" are shown. Note that for the same capacity, smaller diameter impellers require more NPSH. Figure 3. Typical published performance curve. NPSH values increase as impeller diameter decreases.
Net Positive Suction Head: NPSHR and NPSHA | Pumps & Systems
Dec 17, 2011 · Learn how to calculate the net positive suction head available (NPSHA) and required (NPSHR) for centrifugal pumps and avoid cavitation. The web page explains the factors that affect NPSHA, such as atmospheric pressure, water temperature, supply elevation, friction and vapor pressure.
Calculate NPSHa for a Closed & Pressurized System
Oct 31, 2018 · In the first three parts of this five-part series, we covered the calculation of net positive suction head available (NPSHa) for a flooded suction, a lift condition and a third scenario where the water was hot (212 F) on a flooded suction example.
NPSH Pipe Fittings - McMaster-Carr
Male NPSH (National Pipe Straight Hose) threads are compatible with female NPSH threads. Female NPSH threads are compatible with male NPSH, NPT, NPTF, and NPSM threads. For technical drawings and 3-D models, click on a part number.
Calculate NPSHa for a Suction Lift Condition | Pumps & Systems
Aug 20, 2018 · Learn how to use the formula for net positive suction head available (NPSHa) for a suction lift situation, where the liquid surface is below the pump impeller. See an example with water at 68 F and compare it with a flooded suction condition.
10 Things You Need to Know about NPSH - Pumps & Systems
Aug 5, 2015 · NPSH stands for net positive suction head, which is the pressure available to a pump to limit cavitation. Learn about the different forms of NPSH, how to calculate and test them, and how to choose the right materials and methods to prevent cavitation damage.
NPSHR, NPSH3 & Booster Pumps | Pumps & Systems
May 19, 2014 · Q. What is NPSH3, and how does it relate to the NPSHR for a rotodynamic pump? A. The Hydraulic Institute defines the required net positive suction head (NPSHR) of a pump as the net positive suction head available (NPSHA) that will cause the total head (first-stage head of multistage pumps) to be reduced by 3 percent because of flow blockage from …