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Pump Station Piping – Pipe Diameter and Average Flow Velocity

Pipe Diameter

Pipe diameter is based on flow rate (barrels/day) and velocity (ft./sec) in accordance with API recommended practices. Change in inlet pressure can cause cavitation of the pump and create occurrences outside the limits this calculation. D_i=\sqrt{\frac{0.012Q}{V}}

D_i=\sqrt{\frac{0.012Q}{V}}

Average Flow Velocity

Calculating the average liquid flow using the internal diameter the average liquid velocity ft./sec can be calculated using flowrate and diameter. Significant changes in the liquid flow due to operational changes can be a limiting factor. V=\frac{0.012Q}{D_i^2}

V=\frac{0.012Q}{D_i^2}

Where:
𝑉−Average Liquid Flow Velocity (ft/sec)
𝑄−Liquid Flow Rate (bbl/day)
𝐷𝑖−Internal Pipe Diameter (in)

Case Guide

Part 1: Create Case

  1. Select the Pump Station Piping application from the Pump Module
  2. To create a new case, click the “Add Case” button
  3. Enter Case Name, Location, Date and any necessary notes.
  4. Fill out all required Parameters.
  5. Make sure the values you are inputting are in the correct units.
  6. Click the CALCULATE button to overview results.

Input Parameters

  • Liquid Flow Rate (bbl/day)
  • Average Liquid Flow Velocity (ft/sec)
  • Pipe Internal Diameter (in)

Pipe Diameter

Average Flow Velocity

Part 2: Outputs/Reports

  1. If you need to modify an input parameter, click the CALCULATE button after the change.
  2. To SAVE, fill out all required case details then click the SAVE button.
  3. To rename an existing file, click the SAVE As button. Provide all case info then click SAVE.
  4. To generate a REPORT, click the REPORT button.
  5. The user may export the Case/Report by clicking the Export to Excel icon.
  6. To delete a case, click the DELETE icon near the top of the widget.

Results

  • Pipe Internal Diameter (in)
  • Average Liquid Flow Velocity (ft/sec)
  • Erosional Velocity (ft/sec)
  • Sonic Velocity (ft/sec)

Pipe Diameter

Average Flow Velocity

References

  • ASME B31.4 – 1998 Edition “Pipeline Transportation Systems for Liquid Hydrocarbons and other Liquids”, Art. 404.1
  • API 1117 – Movement of In-Service Pipelines
  • API 5L, API 5LS and API 5LX – Specification of Pipe Grade
  • ASTM – Various – Weld Joint Factor
  • CFR Code Part 192
  • MMS Regulations
  • USDA-SCS Modified (Permissible Velocity of Water and Soil Erodibility)
  • Pipeline Rules of Thumb Handbook

Updated on December 26, 2023

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