Potential impact radius (PIR) means the radius of a circle within which the potential failure of a pipeline could have significant impact on people or property. PIR is determined by the formula r = 0.69* (square root of (p*d2)), where ‘r’ is the radius of a circular area in feet surrounding the point of failure, ‘p’ is the maximum allowable operating pressure (MAOP) in the pipeline segment in pounds per square inch and ‘d’ is the nominal diameter of the pipeline in inches.
The numeric variable is tied to the focal product being transported for calculation.
Case Guide
Part 1: Create Case
- Select the Natural Gas Pipeline Rupture – Width, Radius, Depth of Crater application in the AGR & GPRA module.
- To create a new case, click the “Add Case” button.
- Enter Case Name, Location, Date and any necessary notes.
- Fill out all required parameters.
- Make sure the values you are inputting are in the correct units.
- Click the CALCULATE button to overview results
Input Parameters
- Pipe Type
- Pipe Outside Diameter
- Fluid Type
- Specific Gravity
- Pipeline Maximum Operating Pressure
Part 2: Outputs/Reports
- If you need to modify an input parameter, click the CALCULATE button after the change.
- To SAVE, fill out all required case details then click the SAVE button.
- To rename an existing file, click the SAVE As button. Provide all case info then click SAVE.
- To generate a REPORT, click the REPORT button.
- The user may export the Case/Report by clicking the Export to Excel icon.
- To delete a case, click the DELETE icon near the top of the widget.
Results
- Potential Impact Radius
References
- GRI-00/0189, A Model for Sizing High Consequence Areas Associated with Natural Gas Pipelines, Gas Technology Institute
- PHMSA – Final Report TTO Number 13, Delivery Order DTRS56-02-D-70036, Michael Baker Jr., Inc. –
- PHMSA – Final Report TTO Number 14, Delivery Order DTRS56-02-D-70036, , Michael Baker Jr., Inc.
- Crane Limited, Flow of Fluids through Valves, Fittings, and Pipe, Technical Paper No. 410-C, Crane Engineering Division
- Schram, W., “Prediction of Crater Caused by Underground Pipeline Rupture”, N.V. Nederland se Gasunie, Report TR/T 97.R.2515
- NEN 3651, Annex A: “Determining Disturbance Zone Dimension”
- PRCI L51861, “Line Rupture and Spacing of Parallel Lines”, Battelle Memorial Institute