Thoma's Cavitation factor given Net Positive Suction Head Calculator

✖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%
✖The Manometric Head of Centrifugal Pump is the head against which the centrifugal pump has to work.ⓘ Manometric Head of Centrifugal Pump [H_m]			+10% -10%

✖Thoma's Cavitation Factor is used to indicate the onset of cavitation.ⓘ Thoma's Cavitation factor given Net Positive Suction Head [σ]

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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 = H_sv/H_m
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 = H_sv/H_m --> 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 00.020 seconds)

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< Geometric and Flow Parameters Calculators

Volume of liquid at inlet

LaTeX 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

Speed ratio

LaTeX Go Speed Ratio Centrifugal Pump = Tangential Velocity of Impeller at Outlet/sqrt(2*[g]*Manometric Head of Centrifugal Pump)

Weight of liquid

LaTeX Go Weight of Liquid in Pump = Specific Weight of Liquid*Actual Discharge at Centrifugal Pump Outlet

Static head

LaTeX Go Static Head of Centrifugal Pump = Suction Head of Centrifugal Pump+Delivery Head of Pump

Thoma's Cavitation factor given Net Positive Suction Head Formula

LaTeX Go

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

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, Thoma's Cavitation factor given Net Positive Suction Head formula is defined as a dimensionless parameter that characterizes the ability of a centrifugal pump to resist cavitation, which is a critical phenomenon that can lead to pump failure, and is influenced by the suction head and other geometric and flow parameters. 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 (H_sv) & Manometric Head of Centrifugal Pump (H_m) 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?

Thoma's Cavitation factor given Net Positive Suction Head formula is defined as a dimensionless parameter that characterizes the ability of a centrifugal pump to resist cavitation, which is a critical phenomenon that can lead to pump failure, and is influenced by the suction head and other geometric and flow parameters and is represented as σ = H_sv/H_m 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?

Thoma's Cavitation factor given Net Positive Suction Head formula is defined as a dimensionless parameter that characterizes the ability of a centrifugal pump to resist cavitation, which is a critical phenomenon that can lead to pump failure, and is influenced by the suction head and other geometric and flow parameters 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 (H_sv) & Manometric Head of Centrifugal Pump (H_m). 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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