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Net positive suction head Formula

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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. Check FAQs

H sv = H a - H st - H v

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

Net positive suction head Example

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Here is how the Net positive suction head equation looks like with Values.

Here is how the Net positive suction head equation looks like with Units.

Here is how the Net positive suction head equation looks like.

5.5 = 28.7 - 21 - 2.2

5.5m = 28.7m - 21m - 2.2m

5.5 = 28.7 - 21 - 2.2

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Net positive suction head Solution

Follow our step by step solution on how to calculate Net positive suction head?

FIRST Step Consider the formula

H sv = H a - H st - H v

Next Step Substitute values of Variables

∴

H sv = 28.7m - 21m - 2.2m

Next Step Prepare to Evaluate

∴

H sv = 28.7 - 21 - 2.2

LAST Step Evaluate

∴

H sv = 5.5m

Net positive suction head Formula Elements

Variables

Net Positive Suction Head of Centrifugal Pump

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.

Symbol: H_sv

Measurement: LengthUnit: m

Note: Value should be greater than 0.

Formulas to find Net Positive Suction Head of Centrifugal Pump

Atmospheric Pressure Head for Pump

The Atmospheric Pressure Head for Pump is the height of a liquid column that corresponds to the atmospheric pressure.

Symbol: H_a

Measurement: LengthUnit: m

Note: Value should be greater than 0.

Formulas to find Atmospheric Pressure Head for Pump

Static Head of Centrifugal Pump

Static head of centrifugal pump is the sum of suction head and delivery head of the centrifugal pump.

Symbol: H_st

Measurement: LengthUnit: m

Note: Value should be greater than 0.

Formulas to find Static Head of Centrifugal Pump

Vapour Pressure Head

The Vapour Pressure Head is the head corresponding to the vapour pressure of the liquid.

Symbol: H_v

Measurement: LengthUnit: m

Note: Value should be greater than 0.

Formulas to find Vapour Pressure Head

Other formulas in Geometric and Flow Parameters category

Go Speed ratio

K u = \frac{u 2}{\sqrt{2 \cdot [g] \cdot H m}}

Go Volume of liquid at inlet

Q = π \cdot D 1 \cdot B 1 \cdot V f1

Go Weight of liquid

W l = y \cdot Q

Go Static head

H st = h s + h d

How to Evaluate Net positive suction head?

Net positive suction head evaluator uses Net Positive Suction Head of Centrifugal Pump = Atmospheric Pressure Head for Pump-Static Head of Centrifugal Pump-Vapour Pressure Head to evaluate 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 evaluate Net positive suction head using this online evaluator? To use this online evaluator 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.

FAQs on Net positive suction head

What is the formula to find Net positive suction head?

The formula of Net positive suction head is expressed as Net Positive Suction Head of Centrifugal Pump = Atmospheric Pressure Head for Pump-Static Head of Centrifugal Pump-Vapour Pressure Head. Here is an example- 5.5 = 28.7-21-2.2.

How to calculate Net positive suction head?

With Atmospheric Pressure Head for Pump (H_a), Static Head of Centrifugal Pump (H_st) & Vapour Pressure Head (H_v) we can find Net positive suction head using the formula - Net Positive Suction Head of Centrifugal Pump = Atmospheric Pressure Head for Pump-Static Head of Centrifugal Pump-Vapour Pressure Head.

Can the Net positive suction head be negative?

No, the Net positive suction head, measured in Length cannot be negative.

Which unit is used to measure Net positive suction head?

Net positive suction head is usually measured using the Meter[m] for Length. Millimeter[m], Kilometer[m], Decimeter[m] are the few other units in which Net positive suction head can be measured.

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Net positive suction head Formula

Net positive suction head Example

Net positive suction head Solution

Net positive suction head Formula Elements

Other formulas in Geometric and Flow Parameters category

How to Evaluate Net positive suction head?

FAQs on Net positive suction head

Variable Name