Introduction
Pipe wall thickness (WT) is based pipe diameter, SMYS, internal design pressure/factor, joint factor and sum of allowance WT. t_n=t+A\~\t=\frac{P_iD}{2S}
t_n=t+A\\~\\t=\frac{P_iD}{2S}Where:
𝑡𝑛−Nominal Wall Thickness Satisfying Requirements for Pressure and Allowances (in)
𝑡−Pressure Design Wall Thickness (in)
𝐴−Sum of Allowances for Threading and Grooving
𝑃𝑖 − Internal Design Gauge Pressure (psig)
𝐷 − Outside Pipe Diameter (in)
𝑆 − Applicable Allowable Stress Value (psi)
Case Guide
Part 1: Create Case
- Select the Pump Station Piping application from the Pump 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
- Nominal Pipe Size (in)
- Pipe Grade (if pipe grade is unknown use Grade A 24000)
- Wall Thickness (in)
- E – Longitudinal Joint Factor
- F – Design Factor
- Internal Design Pressure (psi)
- A – Sum of Allowances (in)
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
- Required Design Wall Thickness (in)
- Applicable Allowable Stress (psi)
References
- ASME B31.4 – 1998 Edition “Pipeline Transportation Systems for Liquid Hydrocarbons and other Liquids”, Art. 404.1
- API 1117 – Movement of In-Service Pipelines
- API 5L, API 5LS and API 5LX – Specification of Pipe Grade
- ASTM – Various – Weld Joint Factor
- CFR Code Part 192
- MMS Regulations
- USDA-SCS Modified (Permissible Velocity of Water and Soil Erodibility)
- Pipeline Rules of Thumb Handbook