Hoop and Longitudinal Stress

These stresses are used in most calculations for road and RR crossing, spans, blasting, streams, etc. before deciding on the safety of the pipe.
Live hoop and longitudinal stress must be below seam and girth weld fatigues limits. Outside force stresses must be known for proper evaluation.

Hoop Stress
PTLB Design & Stress Analysis_2.11 Intro Image.png
𝑆𝐻 − Hoop stress(psi)
𝑃 − Pipe internal pressure(psi)
𝐷 − Pipe outside diameter(in)
𝑡 − Pipe wall thickness(in)

Longitudinal Stress
PTLB Design & Stress Analysis_2.11 Intro Image 2.png
𝑆𝐿 − Longitudinal stress(psi)
𝑃 − Pipe internal pressure(psi)
𝐷 − Pipe outside diameter(in)
𝑡 − Pipe wall thickness(in)

Input Parameters
To create a new case, click the “Add Case” button
Select the Hoop & Longitudinal Stress application from the Steel Pipe – Design and Stress Analysis module.
Enter Case Name, Location, Date and any necessary notes.
Fill out all required fields.
Make sure the values you are inputting are in the correct units.
Click the CALCULATE button
Nominal Pipe Size(in)
Wall Thickness(in)
Internal Pressure(psi).
PLTB Liquid_DesignStress_2.11 Input Rev_092420.png

Outputs/Reports
View the results.
If an input parameter needs to be edited be sure to hit 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/PowerPoint icon.
To delete a case, click the DELETE icon near the top of the widget.
Hoop Stress(psi)
Longitudinal Stress(psi)
PLTB Liquid_DesignStress_2.11 Output Rev_092420.png

Related Links
Pipeline Design & Stress Analysis

Pipeline HUB — User Resources

Hoop and Longitudinal Stress

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