Angled Line Explosive Charge

An angled-line source that is simplified into an equivalent parallel line source if the its standoff distance is equal to or less than the effective length of the line. The calculation uses a point source solution that simplifies methods for an angled line source. Minimum distance from the pipeline to the nearest explosive charge must be greater than two times outside pipe diameter.
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Maximum allowable angle between pipe and explosive line must be less than 90˚
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𝑅,π΄Β βˆ’ Distance from the Charge to the Pipeline(ft)
π΅Β βˆ’ Angle Between Pipe and Grid(deg), convert to Radians = 𝐡(0.0175)
π‘ƒΒ βˆ’ MAOPβˆ’Maximum Allowable Operating Pressure(psi)
π·Β βˆ’ Pipeline Outside Diameter(in)
π‘‘Β βˆ’ Pipe Wall Thickness(in)
π‘†β„ŽΒ βˆ’ Hoop Stress(psi)
PLTB Pipe Blast 2.3_Intro 3 Revision 082720.png
πΏΒ βˆ’ Total Length of Explosive Line(ft)
𝐿1Β βˆ’ Spacing Length Between Charges in Explosive Line(ft)
π‘ŠΒ βˆ’ Total Charge Weight(lbs)
π‘Š1Β βˆ’ Weight of Single Charge(lbs)
𝑁1Β βˆ’ Number of Charges in Explosive Line
 

PTLB Pipe Blast 2.3_Intro 4.png

PTLB Pipe Blast 2.3_Intro 5.png
π‘†π‘Β βˆ’ Maximum Circumferential =Β π‘†π‘™Β βˆ’ Maximum Longitudinal Stress(psi)
π‘›Β βˆ’ Equivalent Energy Release Ratio
π‘ŠΒ βˆ’ Weight of Single Charge(lbs)
πΈΒ βˆ’ Modulus of Elasticity
π‘‘Β βˆ’ Pipe Wall Thickness(in)
π‘†π‘‘Β βˆ’ Combined Hoop and Circumferential Stress(psi)
PTLB Pipe Blast 2.1_Intro 3.png Blasting Conditions for combined Stress Level πΆπ‘Žπ‘™π‘†π‘€π‘Œπ‘† >%π‘†π‘€π‘Œπ‘† βˆ’ NOT ACCEPTABLE/πΆπ‘Žπ‘™π‘†π‘€π‘Œπ‘† <%π‘†π‘€π‘Œπ‘† βˆ’ ACCEPTABLE

Input Parameters

  1. To create a new case, click the β€œAdd Case” button
  2. Select the Angled Line Explosive Charge application from the Pipe Blast 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.
  • Pipe Outside Diameter
  • Pipe Wall Thickness
  • Specified Minimum Yield Strength
  • Maximum Allowable Combined Stress Level – SMYS
  • Manufacturer
  • Explosive Type
  • Equivalent energy release ratio
  • MAOP – Maximum Allowable Operating Pressure
  • N1 – Number of Charges in Explosive Line
  • L1 – Spacing Length Between Charges in Explosive Line
  • W1 – Weight of Single Charge
  • n – Equivalent Energy Release Ratio
  • A – Distance of the Nearest Charge to Pipeline
  • B – Angle Between Pipe and Grid
PLTB Pipe Blast 2.3_Input Revision 082720.png  

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.
  • Total Length of Explosive Line
  • Total Charge Weight
  • Sh – Hoop Stress
  • Sc-Maximum Circumferential = Sl-Maximum Longitudinal Stress
  • St – Combined Hoop && Circumferential Stress
  • S – Total Combined Stress
  • Calculated Percent of SMYS
  • Blasting Conditions for Combined Stress Level:
PLTB Pipe Blast 2.3_Output Revision 082720.png

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