Accidental Gas Release Full-Bore Pipeline Rupture

Release Rate Equations

Gas release rate is from peak initial release rate from single side and both sides. Some of the limiting factors include effective hole diameter and pressure differential.

π‘„π‘š βˆ’ Peak Initial Release Rate from Single Side of Pipeline Rupture[lbm/sec]

𝐢𝑑 βˆ’ Discharge Coefficient
π‘˜ βˆ’ Specific Heat Ratio of Gas
𝑅 βˆ’ Universal Gas Constant=1545.3[ft βˆ™ lb/lb βˆ™ mol βˆ’Β°R]
𝑇 βˆ’ Gas Temperature[Β°R]
𝑀 βˆ’ Gas Molecular Weight
𝑑 βˆ’ Effective Hole Diameter – LineDiameter[in]
𝑝 βˆ’ Pressure Differentialβˆ’Line Pressure[psi]

For the guillotine-type failure of pipeline rate release, the effective release:

πœ†βˆ’Release Rate Decay Factor = 0.25βˆ’0.

  1. To create a new case, click the β€œAdd Case” button.
  2. Select the Accidental Gas Release Full-Bore Pipeline Rupture application in the AGR & GPRA module.
  3. Enter Case Name, Location, Date and any necessary notes.
  4. Fill out all required fields.
  5. Make sure the values you are inputting are in the correct units.
  6. Click the CALCULATE button.
  • Atmospheric Pressure
  • Gas Temperature
  • Line Pressure at the
  • Leak/Hole Location
  • Discharge Area
  • Cd – Discharge Coefficient – Sharp Orifice
  • Molecular Weight of Gas
  • Specific Heat Ratio of Gas
  • Compressibility Factor of Gas
  • Release Time [minutes]

Outputs/Reports

  1. View the results.
  2. If an input parameter needs to be edited be sure to hit the CALCULATE button after the change.
  3. To SAVE, fill out all required case details then click the SAVE button.
  4. To rename an existing file, click the SAVE As button. Provide all case info then click SAVE.
  5. To generate a REPORT, click the REPORT button.
  6. The user may export the Case/Report by clicking the Export to Excel/PowerPoint icon.
  7. To delete a case, click the DELETE icon near the top of the widget.
  • Critical Pressure Ratio
  • Flow Condition
  • Peak Initial Release Rate – From Single Side
  • Effective Release Rate – From Both Sides

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Related Links

Table of Contents
Table of Pages
  1. Pipeline HUB User Resources
  2. AC Mitigation PowerTool
  3. API Inspectors Toolbox
  4. Horizontal Directional Drilling PowerTool
  5. Crossings Workflow
  6. Pipeline Toolbox
  7. Encroachment Manager
  8. PRCI AC Mitigation Toolbox
  9. PRCI Thermal Analysis for Hot-Tap Welding
  10. PRCI River-X
  11. PRCI RSTRENG
  12. RSTRENG+
  13. Ad-hoc Analysis
  14. Database Import
  15. Data Availability Dashboard
  16. ESRI Map
  17. Report Builder
  18. Hydrotest PowerTool
  19. Investigative Dig PowerTool
  20. Hydraulics PowerTool
  21. External Corrosion Direct Assessment Procedure – RSTRENG
  22. Canvas
  23. Definitions
  24. Pipe Schedule and Specifications Tables