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Suction specific speed Formula

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Suction Specific Speed is defined as the value of speed of different machines operating with a similar degree of cavitation. Check FAQs

N suc = \frac{ω \cdot \sqrt{Q}}{{(H sv)}^{\frac{3}{4}}}

N_suc - Suction Specific Speed?ω - Angular Velocity?Q - Actual Discharge at Centrifugal Pump Outlet?H_sv - Net Positive Suction Head of Centrifugal Pump?

Suction specific speed Example

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Here is how the Suction specific speed equation looks like with Values.

Here is how the Suction specific speed equation looks like with Units.

Here is how the Suction specific speed equation looks like.

11.799 = \frac{179.07 \cdot \sqrt{0.056}}{{(5.5)}^{\frac{3}{4}}}

11.799m/s = \frac{179.07rad/s \cdot \sqrt{0.056m³/s}}{{(5.5m)}^{\frac{3}{4}}}

11.799 = \frac{179.07 \cdot \sqrt{0.056}}{{(5.5)}^{\frac{3}{4}}}

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Suction specific speed Solution

Follow our step by step solution on how to calculate Suction specific speed?

FIRST Step Consider the formula

N suc = \frac{ω \cdot \sqrt{Q}}{{(H sv)}^{\frac{3}{4}}}

Next Step Substitute values of Variables

∴

N suc = \frac{179.07rad/s \cdot \sqrt{0.056m³/s}}{{(5.5m)}^{\frac{3}{4}}}

Next Step Prepare to Evaluate

∴

N suc = \frac{179.07 \cdot \sqrt{0.056}}{{(5.5)}^{\frac{3}{4}}}

Next Step Evaluate

∴

N suc = 11.798989916916m/s

LAST Step Rounding Answer

∴

N suc = 11.799m/s

Suction specific speed Formula Elements

Variables

Functions

Suction Specific Speed

Suction Specific Speed is defined as the value of speed of different machines operating with a similar degree of cavitation.

Symbol: N_suc

Measurement: SpeedUnit: m/s

Note: Value should be greater than 0.

Formulas to find Suction Specific Speed

Angular Velocity

The Angular Velocity of Centrifugal Pump refers to how fast the pump impeller rotates.

Symbol: ω

Measurement: Angular VelocityUnit: rad/s

Note: Value should be greater than 0.

Formulas to find Angular Velocity

Actual Discharge at Centrifugal Pump Outlet

Actual discharge at centrifugal pump outlet is the actual amount of the liquid outflow from the outlet of the centrifugal pump.

Symbol: Q

Measurement: Volumetric Flow RateUnit: m³/s

Note: Value should be greater than 0.

Formulas to find Actual Discharge at Centrifugal Pump Outlet

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

sqrt

A square root function is a function that takes a non-negative number as an input and returns the square root of the given input number.

Syntax: sqrt(Number)

Other formulas in Pump Parameters category

Go Angular Velocity of Centrifugal Pump

ω = \frac{2 \cdot π \cdot N r}{60}

Go Minimum speed for starting centrifugal pump

N min = \frac{120 \cdot η m \cdot V w2 \cdot D 2}{π \cdot ({D 2}^{2} - {D 1}^{2})} \cdot (\frac{2 \cdot π}{60})

Go Volumetric Efficiency of Pump given Discharge and Leakage of Liquid

η vol = \frac{Q}{Q + q}

Go Output power

OP = \frac{w \cdot Q \cdot H m}{1000}

How to Evaluate Suction specific speed?

Suction specific speed evaluator uses Suction Specific Speed = (Angular Velocity*sqrt(Actual Discharge at Centrifugal Pump Outlet))/((Net Positive Suction Head of Centrifugal Pump)^(3/4)) to evaluate the Suction Specific Speed, Suction specific speed formula is defined as a dimensionless parameter that characterizes a pump's suction performance, providing a relative measure of the pump's ability to handle a given flow rate and head, allowing for the comparison of different pump designs and their suitability for specific applications. Suction Specific Speed is denoted by N_suc symbol.

How to evaluate Suction specific speed using this online evaluator? To use this online evaluator for Suction specific speed, enter Angular Velocity (ω), Actual Discharge at Centrifugal Pump Outlet (Q) & Net Positive Suction Head of Centrifugal Pump (H_sv) and hit the calculate button.

FAQs on Suction specific speed

What is the formula to find Suction specific speed?

The formula of Suction specific speed is expressed as Suction Specific Speed = (Angular Velocity*sqrt(Actual Discharge at Centrifugal Pump Outlet))/((Net Positive Suction Head of Centrifugal Pump)^(3/4)). Here is an example- 11.79899 = (179.07*sqrt(0.056))/((5.5)^(3/4)).

How to calculate Suction specific speed?

With Angular Velocity (ω), Actual Discharge at Centrifugal Pump Outlet (Q) & Net Positive Suction Head of Centrifugal Pump (H_sv) we can find Suction specific speed using the formula - Suction Specific Speed = (Angular Velocity*sqrt(Actual Discharge at Centrifugal Pump Outlet))/((Net Positive Suction Head of Centrifugal Pump)^(3/4)). This formula also uses Square Root (sqrt) function(s).

Can the Suction specific speed be negative?

No, the Suction specific speed, measured in Speed cannot be negative.

Which unit is used to measure Suction specific speed?

Suction specific speed is usually measured using the Meter per Second[m/s] for Speed. Meter per Minute[m/s], Meter per Hour[m/s], Kilometer per Hour[m/s] are the few other units in which Suction specific speed can be measured.

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Suction specific speed Formula

Suction specific speed Example

Suction specific speed Solution

Suction specific speed Formula Elements

Other formulas in Pump Parameters category

How to Evaluate Suction specific speed?

FAQs on Suction specific speed

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