Thoma's Cavitation factor given Net Positive Suction Head Solution

STEP 0: Pre-Calculation Summary
Formula Used
Thoma's Cavitation Factor = Net Positive Suction Head of Centrifugal Pump/Manometric Head of Centrifugal Pump
σ = Hsv/Hm
This formula uses 3 Variables
Variables Used
Thoma's Cavitation Factor - Thoma's Cavitation Factor is used to indicate the onset of cavitation.
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.
Manometric Head of Centrifugal Pump - (Measured in Meter) - The Manometric Head of Centrifugal Pump is the head against which the centrifugal pump has to work.
STEP 1: Convert Input(s) to Base Unit
Net Positive Suction Head of Centrifugal Pump: 5.5 Meter --> 5.5 Meter No Conversion Required
Manometric Head of Centrifugal Pump: 25.3 Meter --> 25.3 Meter No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
σ = Hsv/Hm --> 5.5/25.3
Evaluating ... ...
σ = 0.217391304347826
STEP 3: Convert Result to Output's Unit
0.217391304347826 --> No Conversion Required
FINAL ANSWER
0.217391304347826 0.217391 <-- Thoma's Cavitation Factor
(Calculation completed in 00.004 seconds)

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Dayananda Sagar College of Engineering (DSCE), Bengaluru
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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

Thoma's Cavitation factor given Net Positive Suction Head Formula

Thoma's Cavitation Factor = Net Positive Suction Head of Centrifugal Pump/Manometric Head of Centrifugal Pump
σ = Hsv/Hm

When does cavitation occur in centrifugal pumps?

Cavitation begins to appear in centrifugal pumps when the pressure at the suction falls below the vapour pressure of the liquid. Thoma’s cavitation factor is used to indicate the onset of cavitation.

How to Calculate Thoma's Cavitation factor given Net Positive Suction Head?

Thoma's Cavitation factor given Net Positive Suction Head calculator uses Thoma's Cavitation Factor = Net Positive Suction Head of Centrifugal Pump/Manometric Head of Centrifugal Pump to calculate the Thoma's Cavitation Factor, The Thoma's cavitation factor given net positive suction head formula is defined as the ratio of net positive suction head to the manometric head. Thoma's Cavitation Factor is denoted by σ symbol.

How to calculate Thoma's Cavitation factor given Net Positive Suction Head using this online calculator? To use this online calculator for Thoma's Cavitation factor given Net Positive Suction Head, enter Net Positive Suction Head of Centrifugal Pump (Hsv) & Manometric Head of Centrifugal Pump (Hm) and hit the calculate button. Here is how the Thoma's Cavitation factor given Net Positive Suction Head calculation can be explained with given input values -> 0.217391 = 5.5/25.3.

FAQ

What is Thoma's Cavitation factor given Net Positive Suction Head?
The Thoma's cavitation factor given net positive suction head formula is defined as the ratio of net positive suction head to the manometric head and is represented as σ = Hsv/Hm or Thoma's Cavitation Factor = Net Positive Suction Head of Centrifugal Pump/Manometric 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 & The Manometric Head of Centrifugal Pump is the head against which the centrifugal pump has to work.
How to calculate Thoma's Cavitation factor given Net Positive Suction Head?
The Thoma's cavitation factor given net positive suction head formula is defined as the ratio of net positive suction head to the manometric head is calculated using Thoma's Cavitation Factor = Net Positive Suction Head of Centrifugal Pump/Manometric Head of Centrifugal Pump. To calculate Thoma's Cavitation factor given Net Positive Suction Head, you need Net Positive Suction Head of Centrifugal Pump (Hsv) & Manometric Head of Centrifugal Pump (Hm). With our tool, you need to enter the respective value for Net Positive Suction Head of Centrifugal Pump & Manometric 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.
How many ways are there to calculate Thoma's Cavitation Factor?
In this formula, Thoma's Cavitation Factor uses Net Positive Suction Head of Centrifugal Pump & Manometric Head of Centrifugal Pump. We can use 1 other way(s) to calculate the same, which is/are as follows -
  • Thoma's Cavitation Factor = (Atmospheric Pressure Head for Pump-Suction head of centrifugal pump-Vapour Pressure Head)/Manometric Head of Centrifugal Pump
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