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Pumping System Calculation Workflow

Pumping System Design Process:

  1. Determine system requirements (flow rate, pressure)
  2. Calculate total dynamic head (TDH)
  3. Select appropriate pump type
  4. Calculate pump power requirements
  5. Verify NPSH (Net Positive Suction Head)
  6. Optimize system efficiency

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1. Pumping System Design Overview

Pumping system design involves calculating the total dynamic head (TDH) required to move fluid through a piping system at a specified flow rate. This determines the pump size and power requirements.

2. Calculation Methodology

The workflow follows these steps:

  1. Calculate flow velocity: \( v = \frac{Q}{A} \)
  2. Determine Reynolds number: \( Re = \frac{\rho v D}{\mu} \)
  3. Calculate friction factor: \( f \) (based on flow regime)
  4. Compute friction head: \( h_f = \frac{f L v^2}{D 2g} \)
  5. Total dynamic head: \( TDH = h_{static} + h_f \)
  6. Hydraulic power: \( P = \frac{\rho g Q H}{1000} \)

Where:

3. Key Parameters Explained

Total Dynamic Head (TDH): The total equivalent height that the pump needs to overcome, including static lift and friction losses.

Reynolds Number: Determines flow regime (laminar or turbulent) which affects friction calculations.

Hydraulic Power: The theoretical power required to move the fluid, excluding pump inefficiencies.

4. Using the Calculator

Tips: Enter all required parameters in consistent units. For accurate results, ensure pipe diameter is actual internal diameter and viscosity values are correct for the operating temperature.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between static head and dynamic head?
A: Static head is the vertical distance between fluid levels, while dynamic head includes friction losses in pipes and fittings.

Q2: How do I account for fittings and valves?
A: Use equivalent length method - convert each fitting to an equivalent length of straight pipe.

Q3: What if my flow is laminar (Re < 2000)?
A: The calculator automatically uses the correct friction factor calculation for laminar flow.

Q4: How do I select a pump based on these results?
A: Choose a pump whose performance curve meets your required flow rate at the calculated TDH, with some safety margin.

Q5: What about pump efficiency?
A: Actual pump power = Hydraulic power / Pump efficiency. Typical centrifugal pump efficiencies range 50-85%.

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