Pump Engineering

Pump Impeller Inlet Recirculation Limit Velocity Check Calculator

Pump Impeller Inlet Recirculation Limit Velocity Check engineering calculator.

Quick Answer

Calculate Pump Impeller Inlet Recirculation Limit Velocity Check

Calculator

Critical Inlet Velocity (m⁄s)
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Result Interpretation

Pump Impeller Inlet Recirculation Limit Velocity Check Calculator computes Critical Inlet Velocity in m/s using the defined engineering formula and the input values provided.

Worked Example

Verified calculation

Given:

  • Gravitational Acceleration = 9.81
  • Total Head = 30
  • Hydraulic Efficiency = 0.82
  • Critical Thoma Number (σ_c) = 0.065

Expected Result:

  • Critical Inlet Velocity = 6.8306161561876

Engineering Interpretation:

Under the given input conditions, the calculated result is: Critical Inlet Velocity = 6.8306161561876 m/s.

The actual numerical result is computed by the Runtime engine using the persisted tool definition. The values shown here come from automatically validated test cases.

Formula / Method

critical inlet velocity = sqrt(2.0 * σ_c * total head * gravitational acceleration / hydraulic efficiency)

Formula family: formula_pump_pump_impeller_inlet_design_check_for_recirculation_limit

Variables

SymbolLabelRoleDescription
head_total Total Head INPUT Total Head
eta_hydraulic Hydraulic Efficiency INPUT Hydraulic Efficiency
sigma_critical Critical Thoma Number (σ_c) INPUT Critical Thoma Number (σ_c)
g Gravitational Acceleration INPUT Gravitational Acceleration
inlet_velocity Critical Inlet Velocity OUTPUT Critical Inlet Velocity

Calculation Steps

  1. Enter the total head in m.
  2. Enter the hydraulic efficiency in 1.
  3. Enter the critical thoma number (σ_c) in 1.
  4. Enter the gravitational acceleration in m/s^2.
  5. Step 1: Compute critical inlet velocity.
  6. Read the critical inlet velocity (m/s) from the results.

Engineering Summary

Calculate Pump Impeller Inlet Recirculation Limit Velocity Check

Frequently Asked Questions

What does this calculator calculate?

The Pump Impeller Inlet Recirculation Limit Velocity Check Calculator estimates Critical Inlet Velocity based on the input parameters you provide

Why is total head important in this calculation?

total head is directly proportional to critical inlet velocity. When you enter total head in m, the calculator uses it in the engineering formula to compute the output

How should I interpret the result critical inlet velocity?

The calculator outputs critical inlet velocity in m/s. To convert to km/h, multiply the result by 3.6. The result is computed directly from the input values using the defined engineering formula

What units should I use for the inputs?

Enter each value in the units shown next to the input field: Total Head (m), Gravitational Acceleration (m/s^2). Make sure all inputs use the specified units for consistent results

What assumptions does this calculator use?

This calculator uses automatically validated engineering formulas. Results are approximate and should be validated against site-specific conditions, applicable codes, and professional engineering judgment

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