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AutoPIPE Wiki 02. How are nominal design stresses calculates in AutoPIPE for a material?
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            • 01. "Not a valid Material Database load it manually" message appears when using AutoPIPE Vessel, why and how to avoid?
            • 02. How are nominal design stresses calculates in AutoPIPE for a material?
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    02. How are nominal design stresses calculates in AutoPIPE for a material?

    Applies To
    Product(s): AutoPIPE Vessel
    Version(s): ALL
    Area: Material database
    Date Logged
    & Current Version
    March 2020
    41.04.00.013

    Problem:

    How are the nominal design stress under normal operating conditions at test temperature and design (calculation) temperatures calculated in AutoPIPE Vessel for a material (ex. P355NL2)?

    Solution:

    For P355NL2:

    fa = nominal design stress under normal operating conditions at test temperature.

    fTd = nominal design stress under normal operating conditions at calculation temperature.

     fa is equal to min(Rp0,2t/1.5,Rm/2.4) with Rp0.2t = 355 MPa and Rm = 490 MPa and consequently fa = 204.17 MPa

    fTd is equal to min(Rp0,2t/1.5,Rm/2.4) with Rp0.2t = 325 MPa and Rm = 490 MPa and consequently fa = 204.17 MPa

    In fa, the "test temperature" means ambient but the way to define the stress is the same as for fTd.

    Where:

    Rm = Minimum guaranteed tensile strength at room temperature.

    Rp0,2/t = Minimum guaranteed yield strength 0.2 % at design temperature.

    See Also

    AutoPIPE Vessel

    Bentley LEARN Server

    • Design Stress
    • AutoPIPE Vessel
    • material
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    • Mike Dattilio Created by Bentley Colleague Mike Dattilio
    • When: Mon, Mar 9 2020 11:54 AM
    • JamieP Last revision by Bentley Colleague JamieP
    • When: Tue, Aug 18 2020 9:44 AM
    • Revisions: 3
    • Comments: 0
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