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Maximum Allowable Pipe Span Length
Step 1: Variables Definition
𝐷 − Pipe Outside Diameter [in]
𝑊 − Weight [lb/ft], includes water weight if hydrostatic testing is specified
MOAP − Maximum Allowable Operating Pressure [psi]
SMYS − Specified Minimum Yield Strength or Grade of Steel [psi]
OP − Operating Pressure [psi]
𝑡 − Pipe Wall Thickness [in]
𝑆−Section Modulus [in
2
]
𝐼−Moment of Inertia[in
4
]
𝑒− Modulus of Elasticity (29000 ksi)
𝐻 − Hoop Stress [psi]
𝐵 − Bending Stress [psi]
𝑀 − Bending Moment [ft−lb]
𝐿 − Span Length [ft]
𝑑 − Deflection [in]
Step 2: Calculate Hoop Stress
Where 𝑃 = MOP
Step 3: Calculate Maximum Allowable Bending Stress
Solve Von Mises Equation through Quadratic Equation, and then solve for Bending Stress B
Step 4: Calculate Maximum Allowable Bending Moment
Step 5: Calculate Maximum Span Length L, due to Bending
Step 6: Calculate Maximum Span Length L, due to Deflection
Input Parameters
To create a new case, click the “Add Case” button
Select the Maximum Allowable Pipe Span Length (G) 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
Wall Thickness (in.)
Grade
Pipe Class
Youngs Modulus of Steel (psi)
Poisson’s Ratio for Steel
Average Unit Weight of Steel (Calculated)
Pipe installed after November 11, 1970 (Y/N)
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.
Related Links
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Pipeline HUB User Resources
AC Mitigation PowerTool
API Inspectors Toolbox
Horizontal Directional Drilling PowerTool
Crossings Workflow
Pipeline Toolbox
Encroachment Manager
PRCI AC Mitigation Toolbox
PRCI Thermal Analysis for Hot-Tap Welding
PRCI River-X
PRCI RSTRENG
RSTRENG+
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Database Import
Data Availability Dashboard
ESRI Map
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Hydrotest PowerTool
Investigative Dig PowerTool
Hydraulics PowerTool
External Corrosion Direct Assessment Procedure – RSTRENG
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Pipe Schedule and Specifications Tables