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AutoPIPE Wiki 06f. Modeling a Manway / access port in a pipe sidewall using AutoPIPE
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          • 06e. How to model a pipe riser (vertical pipe) to correctly account for GR weight on each floor support in AutoPIPE
          • 06f. Modeling a Manway / access port in a pipe sidewall using AutoPIPE
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    06f. Modeling a Manway / access port in a pipe sidewall using AutoPIPE

    Applies To
    Product(s): AutoPIPE
    Version(s): ALL;
    Area: Modeling
    Date Logged
    & Current Version
    March 2020
    12.02.00.14

    Problem:

    How to model a manway in a side of a large diameter pipe?

    Solution:

    Bentley AutoPIPE like most other stress programs uses 1-D finite elements which use simple Beam element center-line based theory, also known as the stiffness or displacement method, to mathematically model the piping system in three dimensional space. The system is formulated into a set of linear equations, describing the system characteristics at each degree of freedom (DOF). However, AutoPIPE differs from other applications because each point (e.g., piping, soil, beam, etc.) in an AutoPIPE modeled system has six (6) degrees of freedom. The exact formulation of these equations and their solution depends on the type of loading being investigated.

    With that said, AutoPIPE can provide an approximation to model a large irregular shaped opening in a pipe run. Suggested approach:

    1. Model opening as a single node point.

    2. Insert point load to consider weight of cover / lid.

    3. Calculate SIF (use App D or other to calculate an SIF to approximate the hole). 

    4. Insert SIF at node point.

    Again this is an approximation. For more accuracy, suggest to performing analysis using a full FEA application.     

    See Also

    Modeling Approach

    Bentley AutoPIPE

    • piping
    • Manway
    • AutoPIPE
    • Modeling
    • Access
    • Manhole
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    • Mike Dattilio Created by Bentley Colleague Mike Dattilio
    • When: Tue, Mar 24 2020 5:38 PM
    • Mike Dattilio Last revision by Bentley Colleague Mike Dattilio
    • When: Tue, Mar 24 2020 5:43 PM
    • Revisions: 4
    • Comments: 0
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