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
Hsv = Ha-Hst-Hv
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
Hsv = Ha-Hst-Hv --> 28.7-21-2.2
Evaluating ... ...
Hsv = 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 00.004 seconds)

Credits

Created by Sagar S Kulkarni
Dayananda Sagar College of Engineering (DSCE), Bengaluru
Sagar S Kulkarni has created this Calculator and 200+ more calculators!
Verified by Chilvera Bhanu Teja
Institute of Aeronautical Engineering (IARE), Hyderabad
Chilvera Bhanu Teja has verified this Calculator and 200+ more calculators!

19 Geometric and Flow Parameters Calculators

Mechanical efficiency given Specific Weight of Liquid
Go Mechanical efficiency of centrifugal pump = (Specific weight of fluid in pump*(Actual discharge at centrifugal pump outlet+Leakage of Liquid from Impeller)*(Velocity of Whirl at Outlet*Tangential Velocity of Impeller at Outlet/[g]))/Input power to centrifugal pump
Overall efficiency
Go Overall efficiency of centrifugal pump = (Specific weight of fluid in pump*Actual discharge at centrifugal pump outlet*Manometric Head of Centrifugal Pump)/Input power to centrifugal pump
Flow velocity at outlet given volume of liquid
Go Flow velocity at outlet of centrifugal pump = Actual discharge at centrifugal pump outlet/(pi*Diameter of centrifugal pump impeller at outlet*Width of Impeller at Outlet)
Volume of liquid at outlet
Go Actual discharge at centrifugal pump outlet = pi*Diameter of centrifugal pump impeller at outlet*Width of Impeller at Outlet*Flow velocity at outlet of centrifugal pump
Flow velocity at inlet given volume of liquid
Go Flow velocity at inlet of centrifugal pump = Actual discharge at centrifugal pump outlet/(pi*Diameter of centrifugal pump impeller at inlet*Width of Impeller at Inlet)
Volume of liquid at inlet
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
Thoma's cavitation factor
Go Thoma's Cavitation Factor = (Atmospheric Pressure Head for Pump-Suction head of centrifugal pump-Vapour Pressure Head)/Manometric Head of Centrifugal Pump
Leakage of Liquid given Volumetric Efficiency and Discharge
Go Leakage of Liquid from Impeller = (Actual discharge at centrifugal pump outlet/Volumetric efficiency of centrifugal pump)-Actual discharge at centrifugal pump outlet
Torque at outlet
Go Torque at Centrifugal Pump Outlet = (Weight of liquid in pump/[g])*Velocity of Whirl at Outlet*Radius of Impeller at Outlet
Flow velocity given flow ratio
Go Flow velocity at outlet of centrifugal pump = Flow ratio centrifugal pump*sqrt(2*[g]*Manometric Head of Centrifugal Pump)
Flow ratio
Go Flow ratio centrifugal pump = Flow velocity at outlet of centrifugal pump/sqrt(2*[g]*Manometric Head of Centrifugal Pump)
Diameter of delivery pipe
Go Diameter of delivery pipe of pump = sqrt((4*Actual discharge at centrifugal pump outlet)/(pi*Velocity in Delivery Pipe))
Speed ratio
Go Speed ratio centrifugal pump = Tangential Velocity of Impeller at Outlet/sqrt(2*[g]*Manometric Head of Centrifugal Pump)
Diameter of suction pipe
Go Diameter of suction pipe of pump = sqrt((4*Actual discharge at centrifugal pump outlet)/(pi*Velocity in Suction Pipe))
Net positive suction head
Go Net Positive Suction Head of Centrifugal Pump = Atmospheric Pressure Head for Pump-Static Head of Centrifugal Pump-Vapour Pressure Head
Thoma's Cavitation factor given Net Positive Suction Head
Go Thoma's Cavitation Factor = Net Positive Suction Head of Centrifugal Pump/Manometric Head of Centrifugal Pump
Weight of liquid
Go Weight of liquid in pump = Specific Weight of Liquid*Actual discharge at centrifugal pump outlet
Static head
Go Static Head of Centrifugal Pump = Suction head of centrifugal pump+Delivery head of pump
Vane efficiency
Go Vane Efficiency = Actual Head of Pump/Euler Head of Pump

Net positive suction head Formula

Net Positive Suction Head of Centrifugal Pump = Atmospheric Pressure Head for Pump-Static Head of Centrifugal Pump-Vapour Pressure Head
Hsv = Ha-Hst-Hv

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, The Net positive suction head formula is defined as the difference between the atmospheric pressure head, static head and vapour pressure head. Net Positive Suction Head of Centrifugal Pump is denoted by Hsv 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 (Ha), Static Head of Centrifugal Pump (Hst) & Vapour Pressure Head (Hv) 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?
The Net positive suction head formula is defined as the difference between the atmospheric pressure head, static head and vapour pressure head and is represented as Hsv = Ha-Hst-Hv 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?
The Net positive suction head formula is defined as the difference between the atmospheric pressure head, static head and vapour pressure head 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 (Ha), Static Head of Centrifugal Pump (Hst) & Vapour Pressure Head (Hv). 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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