Searching...
  1. Home
  2. Our Products
  3. Pipeline Toolbox
  4. Pipeline Testing
  5. Gas
  6. Gas Pipeline Testing – Maximum Pressure Drop (Gas)

Gas Pipeline Testing – Maximum Pressure Drop (Gas)

Contents

Introduction

Maximum pressure drop is performed by balancing changes in the measured pressure in the test section against the theoretical pressure changes calculated from changes in the measured temperature of the test section.

Ambient temperature swings can cause challenges regarding pressure changes. Temperature gauges must far enough away from exposed piping to avoid erroneous readings. : P_{max}=\bigg( \frac{P_1t}{949D} \bigg)

P_{max}=\bigg( \frac{P_1t}{949D}  \bigg)

Where:
𝑃𝑚𝑎𝑥 − Maximum Pressure Drop (psi)
𝐷 − Internal Pipe Diameter (in)
𝑡 − Shut in Time (hr)
𝑃1 − Initial Test Pressure (psi)

Case Guide

Part 1: Create Case

  1. Select the Gas Pipeline Testing – Maximum Pressure Drop application from the Testing 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

  • Pipe Type (Drop Down)
  • Nominal Pipe Diameter
  • Outside Pipe Diameter (in)
  • Wall Thickness (in)
  • Reduced Wall Thickness (in)
  • Pipe Grade
  • Internal Pipe Diameter (in)
  • Operating Pressure (psig)
  • Shut-in time (hr)

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

  • Acceptable Pressure Loss (psi)

References

  • Pipeline Design for Hydrocarbons Gases and Liquids, Committee of pipeline planning, American Association of Civil Engineers, 1975
  • Engineering Data Book, Volume II, Gas Processor Association, Revised Tenth Edition, 1994
  • Pipeline Design & Construction, A Practical Approach, American Society of Mechanical Engineers, 2000

FAQ

  • Gas Purging Calculations?

    Purging is a process of removing gas from the pipeline. Controlled purging of gases from pipelines by direct displacement with other gases that have been safely practiced for many years with the recognition that some flammable mixture is present. Purging of gases from pipelines by direct displacement with another gas also has been similarly practiced. It works both ways; however, there will always be an atmosphere of type of a mixture. This is due to the densities of the gases. Check Out

  • What are the differences between the Semiempirical Blowdown calculation and the AGA Blowdown calculation?

    AGA blowdown calculation is based on the specification defined by American Gas Association. Semiempirical blowdown calculation was developed from the SW Research Report calculations for the blowdown time and mass of gas vented to atmosphere of a piping system. Check Out

Updated on January 4, 2024
Tagged:

Was this article helpful?

Yes No

Related Articles