Net positive suction head Calculator

✖The Atmospheric Pressure Head for Pump is the height of a liquid column that corresponds to the atmospheric pressure.ⓘ Atmospheric Pressure Head for Pump [H_a]			+10% -10%
✖Static head of centrifugal pump is the sum of suction head and delivery head of the centrifugal pump.ⓘ Static Head of Centrifugal Pump [H_st]			+10% -10%
✖The Vapour Pressure Head is the head corresponding to the vapour pressure of the liquid.ⓘ Vapour Pressure Head [H_v]			+10% -10%

✖The Net Positive Suction Head of Centrifugal Pump is the net head required to make the liquid flow through the suction pipe from the sump to the impeller.ⓘ Net positive suction head [H_sv]

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Net positive suction head Solution

STEP 0: Pre-Calculation Summary

Formula Used

Net Positive Suction Head of Centrifugal Pump = Atmospheric Pressure Head for Pump-Static Head of Centrifugal Pump-Vapour Pressure Head
H_sv = H_a-H_st-H_v
This formula uses 4 Variables

Variables Used

Net Positive Suction Head of Centrifugal Pump - (Measured in Meter) - The Net Positive Suction Head of Centrifugal Pump is the net head required to make the liquid flow through the suction pipe from the sump to the impeller.
Atmospheric Pressure Head for Pump - (Measured in Meter) - The Atmospheric Pressure Head for Pump is the height of a liquid column that corresponds to the atmospheric pressure.
Static Head of Centrifugal Pump - (Measured in Meter) - Static head of centrifugal pump is the sum of suction head and delivery head of the centrifugal pump.
Vapour Pressure Head - (Measured in Meter) - The Vapour Pressure Head is the head corresponding to the vapour pressure of the liquid.

STEP 1: Convert Input(s) to Base Unit

Atmospheric Pressure Head for Pump: 28.7 Meter --> 28.7 Meter No Conversion Required
Static Head of Centrifugal Pump: 21 Meter --> 21 Meter No Conversion Required
Vapour Pressure Head: 2.2 Meter --> 2.2 Meter No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

H_sv = H_a-H_st-H_v --> 28.7-21-2.2

Evaluating ... ...

H_sv = 5.5

STEP 3: Convert Result to Output's Unit

5.5 Meter --> No Conversion Required

FINAL ANSWER

5.5 Meter <-- Net Positive Suction Head of Centrifugal Pump

(Calculation completed in 00.020 seconds)

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Created by Sagar S Kulkarni

Dayananda Sagar College of Engineering (DSCE), Bengaluru

Sagar S Kulkarni has created this Calculator and 200+ more calculators!

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Institute of Aeronautical Engineering (IARE), Hyderabad

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< Geometric and Flow Parameters Calculators

Volume of liquid at inlet

LaTeX Go Actual Discharge at Centrifugal Pump Outlet = pi*Diameter of Centrifugal Pump Impeller at Inlet*Width of Impeller at Inlet*Flow Velocity at Inlet of Centrifugal Pump

Speed ratio

LaTeX Go Speed Ratio Centrifugal Pump = Tangential Velocity of Impeller at Outlet/sqrt(2*[g]*Manometric Head of Centrifugal Pump)

Weight of liquid

LaTeX Go Weight of Liquid in Pump = Specific Weight of Liquid*Actual Discharge at Centrifugal Pump Outlet

Static head

LaTeX Go Static Head of Centrifugal Pump = Suction Head of Centrifugal Pump+Delivery Head of Pump

Net positive suction head Formula

LaTeX Go

Net Positive Suction Head of Centrifugal Pump = Atmospheric Pressure Head for Pump-Static Head of Centrifugal Pump-Vapour Pressure Head
H_sv = H_a-H_st-H_v

What is Net positive suction head?

NPSH may be defined as “the net head (in metres of liquid) that is required to make the liquid flow through the suction pipe from the sump to the impeller.”

How to Calculate Net positive suction head?

Net positive suction head calculator uses Net Positive Suction Head of Centrifugal Pump = Atmospheric Pressure Head for Pump-Static Head of Centrifugal Pump-Vapour Pressure Head to calculate the Net Positive Suction Head of Centrifugal Pump, Net positive suction head formula is defined as the difference in pressure between the suction side and the vapor pressure of the fluid being pumped, which is critical in determining the safe operation of centrifugal pumps by preventing cavitation and ensuring efficient fluid flow. Net Positive Suction Head of Centrifugal Pump is denoted by H_sv symbol.

How to calculate Net positive suction head using this online calculator? To use this online calculator for Net positive suction head, enter Atmospheric Pressure Head for Pump (H_a), Static Head of Centrifugal Pump (H_st) & Vapour Pressure Head (H_v) and hit the calculate button. Here is how the Net positive suction head calculation can be explained with given input values -> 5.5 = 28.7-21-2.2.

FAQ

What is Net positive suction head?

Net positive suction head formula is defined as the difference in pressure between the suction side and the vapor pressure of the fluid being pumped, which is critical in determining the safe operation of centrifugal pumps by preventing cavitation and ensuring efficient fluid flow and is represented as H_sv = H_a-H_st-H_v or Net Positive Suction Head of Centrifugal Pump = Atmospheric Pressure Head for Pump-Static Head of Centrifugal Pump-Vapour Pressure Head. The Atmospheric Pressure Head for Pump is the height of a liquid column that corresponds to the atmospheric pressure, Static head of centrifugal pump is the sum of suction head and delivery head of the centrifugal pump & The Vapour Pressure Head is the head corresponding to the vapour pressure of the liquid.

How to calculate Net positive suction head?

Net positive suction head formula is defined as the difference in pressure between the suction side and the vapor pressure of the fluid being pumped, which is critical in determining the safe operation of centrifugal pumps by preventing cavitation and ensuring efficient fluid flow is calculated using Net Positive Suction Head of Centrifugal Pump = Atmospheric Pressure Head for Pump-Static Head of Centrifugal Pump-Vapour Pressure Head. To calculate Net positive suction head, you need Atmospheric Pressure Head for Pump (H_a), Static Head of Centrifugal Pump (H_st) & Vapour Pressure Head (H_v). With our tool, you need to enter the respective value for Atmospheric Pressure Head for Pump, Static Head of Centrifugal Pump & Vapour Pressure Head and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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