Suction specific speed Calculator

✖Angular velocity of centrifugal pump refers to how fast the pump impeller rotates.ⓘ Angular velocity of centrifugal pump [N]			+10% -10%
✖Actual discharge at centrifugal pump outlet is the actual amount of the liquid outflow from the outlet of the centrifugal pump.ⓘ Actual discharge at centrifugal pump outlet [Q]			+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 of Centrifugal Pump [H_sv]			+10% -10%

✖Suction Specific Speed is defined as the value of speed of different machines operating with a similar degree of cavitation.ⓘ Suction specific speed [N_suc]

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Formula

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Suction specific speed

Formula

`"N"_{"suc"} = ("N"*sqrt("Q"))/(("H"_{"sv"})^(3/4))`

Example

`"11.79899m/s"=("179.07rad/s"*sqrt("0.056m³/s"))/(("5.5m")^(3/4))`

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Suction specific speed Solution

STEP 0: Pre-Calculation Summary

Formula Used

Suction Specific Speed = (Angular velocity of centrifugal pump*sqrt(Actual discharge at centrifugal pump outlet))/((Net Positive Suction Head of Centrifugal Pump)^(3/4))
N_suc = (N*sqrt(Q))/((H_sv)^(3/4))
This formula uses 1 Functions, 4 Variables

Functions Used

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., sqrt(Number)

Variables Used

Suction Specific Speed - (Measured in Meter per Second) - Suction Specific Speed is defined as the value of speed of different machines operating with a similar degree of cavitation.
Angular velocity of centrifugal pump - (Measured in Radian per Second) - Angular velocity of centrifugal pump refers to how fast the pump impeller rotates.
Actual discharge at centrifugal pump outlet - (Measured in Cubic Meter per Second) - Actual discharge at centrifugal pump outlet is the actual amount of the liquid outflow from the outlet of the centrifugal pump.
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.

STEP 1: Convert Input(s) to Base Unit

Angular velocity of centrifugal pump: 179.07 Radian per Second --> 179.07 Radian per Second No Conversion Required
Actual discharge at centrifugal pump outlet: 0.056 Cubic Meter per Second --> 0.056 Cubic Meter per Second No Conversion Required
Net Positive Suction Head of Centrifugal Pump: 5.5 Meter --> 5.5 Meter No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

N_suc = (N*sqrt(Q))/((H_sv)^(3/4)) --> (179.07*sqrt(0.056))/((5.5)^(3/4))

Evaluating ... ...

N_suc = 11.798989916916

STEP 3: Convert Result to Output's Unit

11.798989916916 Meter per Second --> No Conversion Required

FINAL ANSWER

11.798989916916 ≈ 11.79899 Meter per Second <-- Suction Specific Speed

(Calculation completed in 00.004 seconds)

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Dayananda Sagar College of Engineering (DSCE), Bengaluru

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< 15 Pump Parameters Calculators

Minimum speed for starting centrifugal pump

Go Minimum Speed for Starting Centrifugal Pump = (120*Manometric Efficiency of Centrifugal Pump*Velocity of Whirl at Outlet*Diameter of centrifugal pump impeller at outlet)/(pi*(Diameter of centrifugal pump impeller at outlet^2-Diameter of centrifugal pump impeller at inlet^2))*((2*pi)/60)

Work done per second when Flow at Inlet is not Radial

Go Work Done by Pump per Second = (Weight of liquid in pump/[g])*((Velocity of Whirl at Outlet*Tangential Velocity of Impeller at Outlet)-(Velocity of Whirl at Inlet*Tangential Velocity of Impeller at Inlet))

Work done per second per unit weight of liquid if flow at inlet is not radial

Go Work Done by Centrifugal Pump = ((Velocity of Whirl at Outlet*Tangential Velocity of Impeller at Outlet)-(Velocity of Whirl at Inlet*Tangential Velocity of Impeller at Inlet))/[g]

Angular Speed given Specific Speed of Pump

Go Angular velocity of centrifugal pump = (Specific Speed of Centrifugal Pump*(Manometric Head of Centrifugal Pump^(3/4)))/(sqrt(Actual discharge at centrifugal pump outlet))

Specific Speed of Pump

Go Specific Speed of Centrifugal Pump = (Angular velocity of centrifugal pump*sqrt(Actual discharge at centrifugal pump outlet))/(Manometric Head of Centrifugal Pump^(3/4))

Suction specific speed

Go Suction Specific Speed = (Angular velocity of centrifugal pump*sqrt(Actual discharge at centrifugal pump outlet))/((Net Positive Suction Head of Centrifugal Pump)^(3/4))

Head of Pump given Specific Speed

Go Manometric Head of Centrifugal Pump = (Angular velocity of centrifugal pump*sqrt(Actual discharge at centrifugal pump outlet)/Specific Speed of Centrifugal Pump)^(4/3)

Volumetric Efficiency of Pump given Discharge and Leakage of Liquid

Go Volumetric efficiency of centrifugal pump = Actual discharge at centrifugal pump outlet/(Actual discharge at centrifugal pump outlet+Leakage of Liquid from Impeller)

Discharge of pump given specific speed

Go Actual discharge at centrifugal pump outlet = (Specific Speed of Centrifugal Pump*(Manometric Head of Centrifugal Pump^(3/4))/Angular velocity of centrifugal pump)^2

Work done per second for Centrifugal pumps

Go Work Done by Pump per Second = (Weight of liquid in pump/[g])*Velocity of Whirl at Outlet*Tangential Velocity of Impeller at Outlet

Output power

Go Output Power of Centrifugal Pump = (Specific weight of fluid in pump*Actual discharge at centrifugal pump outlet*Manometric Head of Centrifugal Pump)/1000

Static power

Go Static power of centrifugal pump = (Specific weight of fluid in pump*Actual discharge at centrifugal pump outlet*Static Head of Centrifugal Pump)/1000

Work done per second per unit weight of liquid

Go Work Done by Centrifugal Pump = (Velocity of Whirl at Outlet*Tangential Velocity of Impeller at Outlet)/[g]

Work done per second given Torque

Go Work Done by Pump per Second = Torque at Centrifugal Pump Outlet*Angular velocity of centrifugal pump

Angular Velocity of Centrifugal Pump

Go Angular Velocity = (2*pi*Speed of Impeller in RPM)/60

Suction specific speed Formula

What is the significance of Suction specific speed?

When the different machines have equal values of (Ns)suc., it indicates that the machines are operating with similar degree of cavitation.

How to Calculate Suction specific speed?

Suction specific speed calculator uses Suction Specific Speed = (Angular velocity of centrifugal pump*sqrt(Actual discharge at centrifugal pump outlet))/((Net Positive Suction Head of Centrifugal Pump)^(3/4)) to calculate the Suction Specific Speed, The Suction specific speed formula is defined as the ratio of product of impeller speed and square root of discharge to the net positive suction head raised to the power of 3/4. Suction Specific Speed is denoted by N_suc symbol.

How to calculate Suction specific speed using this online calculator? To use this online calculator for Suction specific speed, enter Angular velocity of centrifugal pump (N), Actual discharge at centrifugal pump outlet (Q) & Net Positive Suction Head of Centrifugal Pump (H_sv) and hit the calculate button. Here is how the Suction specific speed calculation can be explained with given input values -> 11.79904 = (179.07*sqrt(0.056))/((5.5)^(3/4)).

FAQ

What is Suction specific speed?

The Suction specific speed formula is defined as the ratio of product of impeller speed and square root of discharge to the net positive suction head raised to the power of 3/4 and is represented as N_suc = (N*sqrt(Q))/((H_sv)^(3/4)) or Suction Specific Speed = (Angular velocity of centrifugal pump*sqrt(Actual discharge at centrifugal pump outlet))/((Net Positive Suction Head of Centrifugal Pump)^(3/4)). Angular velocity of centrifugal pump refers to how fast the pump impeller rotates, Actual discharge at centrifugal pump outlet is the actual amount of the liquid outflow from the outlet of the 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.

How to calculate Suction specific speed?

The Suction specific speed formula is defined as the ratio of product of impeller speed and square root of discharge to the net positive suction head raised to the power of 3/4 is calculated using Suction Specific Speed = (Angular velocity of centrifugal pump*sqrt(Actual discharge at centrifugal pump outlet))/((Net Positive Suction Head of Centrifugal Pump)^(3/4)). To calculate Suction specific speed, you need Angular velocity of centrifugal pump (N), Actual discharge at centrifugal pump outlet (Q) & Net Positive Suction Head of Centrifugal Pump (H_sv). With our tool, you need to enter the respective value for Angular velocity of centrifugal pump, Actual discharge at centrifugal pump outlet & Net Positive Suction Head of Centrifugal Pump 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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