Minimum speed for starting centrifugal pump Calculator

✖Manometric Efficiency of Centrifugal Pump is the ratio of manometric head and head imparted by the impeller.ⓘ Manometric Efficiency of Centrifugal Pump [η_m]			+10% -10%
✖The Velocity of Whirl at Outlet is the tangential component of absolute velocity at the blade outlet.ⓘ Velocity of Whirl at Outlet [V_w2]			+10% -10%
✖Diameter of centrifugal pump impeller at outlet is the diameter of the impeller at the outlet of the centrifugal pump.ⓘ Diameter of Centrifugal Pump Impeller at Outlet [D₂]			+10% -10%
✖Diameter of centrifugal pump impeller at inlet is the diameter of the impeller at the inlet of the centrifugal pump.ⓘ Diameter of Centrifugal Pump Impeller at Inlet [D₁]			+10% -10%

✖Minimum Speed for Starting Centrifugal Pump is the minimum required speed at which the pump impeller should rotate for starting of suction for the pump.ⓘ Minimum speed for starting centrifugal pump [N_min]

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Minimum speed for starting centrifugal pump Solution

STEP 0: Pre-Calculation Summary

Formula Used

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)
N_min = (120*η_m*V_w2*D₂)/(pi*(D₂^2-D₁^2))*((2*pi)/60)
This formula uses 1 Constants, 5 Variables

Constants Used

pi - Archimedes' constant Value Taken As 3.14159265358979323846264338327950288

Variables Used

Minimum Speed for Starting Centrifugal Pump - (Measured in Revolution per Minute) - Minimum Speed for Starting Centrifugal Pump is the minimum required speed at which the pump impeller should rotate for starting of suction for the pump.
Manometric Efficiency of Centrifugal Pump - Manometric Efficiency of Centrifugal Pump is the ratio of manometric head and head imparted by the impeller.
Velocity of Whirl at Outlet - (Measured in Meter per Second) - The Velocity of Whirl at Outlet is the tangential component of absolute velocity at the blade outlet.
Diameter of Centrifugal Pump Impeller at Outlet - (Measured in Meter) - Diameter of centrifugal pump impeller at outlet is the diameter of the impeller at the outlet of the centrifugal pump.
Diameter of Centrifugal Pump Impeller at Inlet - (Measured in Meter) - Diameter of centrifugal pump impeller at inlet is the diameter of the impeller at the inlet of the centrifugal pump.

STEP 1: Convert Input(s) to Base Unit

Manometric Efficiency of Centrifugal Pump: 0.82 --> No Conversion Required
Velocity of Whirl at Outlet: 16 Meter per Second --> 16 Meter per Second No Conversion Required
Diameter of Centrifugal Pump Impeller at Outlet: 0.28 Meter --> 0.28 Meter No Conversion Required
Diameter of Centrifugal Pump Impeller at Inlet: 0.19 Meter --> 0.19 Meter No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

N_min = (120*η_m*V_w2*D₂)/(pi*(D₂^2-D₁^2))*((2*pi)/60) --> (120*0.82*16*0.28)/(pi*(0.28^2-0.19^2))*((2*pi)/60)

Evaluating ... ...

N_min = 347.385342789598

STEP 3: Convert Result to Output's Unit

36.3781080272333 Radian per Second --> No Conversion Required

FINAL ANSWER

36.3781080272333 ≈ 36.37811 Radian per Second <-- Minimum Speed for Starting Centrifugal Pump

(Calculation completed in 00.020 seconds)

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< Pump Parameters Calculators

Minimum speed for starting centrifugal pump

LaTeX 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)

Volumetric Efficiency of Pump given Discharge and Leakage of Liquid

LaTeX Go Volumetric Efficiency of Centrifugal Pump = Actual Discharge at Centrifugal Pump Outlet/(Actual Discharge at Centrifugal Pump Outlet+Leakage of Liquid from Impeller)

Output power

LaTeX Go Output Power of Centrifugal Pump = (Specific Weight of Fluid in Pump*Actual Discharge at Centrifugal Pump Outlet*Manometric Head of Centrifugal Pump)/1000

Angular Velocity of Centrifugal Pump

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

Minimum speed for starting centrifugal pump Formula

LaTeX Go

What is the significance of minimum starting speed?

If the pressure rise in the impeller is more than or equal to manometric head (Hm) the centrifugal pump will start delivering water, otherwise, the pump will not discharge any water, though the impeller is rotating. Hence the minimum starting speed is determined.

How to Calculate Minimum speed for starting centrifugal pump?

Minimum speed for starting centrifugal pump calculator uses 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) to calculate the Minimum Speed for Starting Centrifugal Pump, Minimum speed for starting centrifugal pump formula is defined as the lowest speed required for a centrifugal pump to start functioning efficiently, taking into account the pump's parameters such as motor efficiency, water flow rate, and impeller diameters, to ensure a smooth and effective pumping operation. Minimum Speed for Starting Centrifugal Pump is denoted by N_min symbol.

How to calculate Minimum speed for starting centrifugal pump using this online calculator? To use this online calculator for Minimum speed for starting centrifugal pump, enter Manometric Efficiency of Centrifugal Pump (η_m), Velocity of Whirl at Outlet (V_w2), Diameter of Centrifugal Pump Impeller at Outlet (D₂) & Diameter of Centrifugal Pump Impeller at Inlet (D₁) and hit the calculate button. Here is how the Minimum speed for starting centrifugal pump calculation can be explained with given input values -> 36.37811 = (120*0.82*16*0.28)/(pi*(0.28^2-0.19^2))*((2*pi)/60).

FAQ

What is Minimum speed for starting centrifugal pump?

Minimum speed for starting centrifugal pump formula is defined as the lowest speed required for a centrifugal pump to start functioning efficiently, taking into account the pump's parameters such as motor efficiency, water flow rate, and impeller diameters, to ensure a smooth and effective pumping operation and is represented as N_min = (120*η_m*V_w2*D₂)/(pi*(D₂^2-D₁^2))*((2*pi)/60) or 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). Manometric Efficiency of Centrifugal Pump is the ratio of manometric head and head imparted by the impeller, The Velocity of Whirl at Outlet is the tangential component of absolute velocity at the blade outlet, Diameter of centrifugal pump impeller at outlet is the diameter of the impeller at the outlet of the centrifugal pump & Diameter of centrifugal pump impeller at inlet is the diameter of the impeller at the inlet of the centrifugal pump.

How to calculate Minimum speed for starting centrifugal pump?

Minimum speed for starting centrifugal pump formula is defined as the lowest speed required for a centrifugal pump to start functioning efficiently, taking into account the pump's parameters such as motor efficiency, water flow rate, and impeller diameters, to ensure a smooth and effective pumping operation is calculated using 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). To calculate Minimum speed for starting centrifugal pump, you need Manometric Efficiency of Centrifugal Pump (η_m), Velocity of Whirl at Outlet (V_w2), Diameter of Centrifugal Pump Impeller at Outlet (D₂) & Diameter of Centrifugal Pump Impeller at Inlet (D₁). With our tool, you need to enter the respective value for Manometric Efficiency of Centrifugal Pump, Velocity of Whirl at Outlet, Diameter of Centrifugal Pump Impeller at Outlet & Diameter of Centrifugal Pump Impeller at Inlet 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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