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AutoPIPE Wiki 01. How to calculate B31.8 -2003 code allowable of per code equation:
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                • 01. How to calculate B31.8 -2003 code allowable of per code equation:
                • 02. How to calculate the combined stress for a node point, equation used, and individual values being applied in the AutoPIPE equation?
                • 03. ASME B31.8, the hoop stress uses the D/t ratio to decide which formula to use, thin or thick, what is AutoPIPE doing?
                • 04. Using ASME B31.8 2012-2016, how is the hoop stress being calculated in AutoPIPE?
                • 05. ASME B31.8, AutoPIPE does not seem to consider the bending stresses in the pipe due to large diameter elastic bends ( 1200 m). it only reports the stresses due to pressure , temperature and gravity?
                • 06. Why are Hydrotest results different using AutoPIPE ASME B31.8 piping code?
                • 07. How can I set the RESTRAINED pipe option for B31.8 2007 onshore / underground piping
                • 08. Why are the Stress results for ASME B31.8 (2014) 0.00 in AutoPIPE's results Grids and output reports?
                • 09. How to calculate the Hoop stress and Hoop allowable for ASME B31.8?
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    01. How to calculate B31.8 -2003 code allowable of per code equation:

    Applies To
    Product(s): AutoPIPE
    Version(s): 2004, XM, V8i 
    Area: Calculation
    Original Author: Bentley Technical Support Group
    Date Logged
    & Current Version
    Jan 2015
    09.06.01.10

    Problem:

    How to calculate B31.8 - 2003 code allowable of per code equation:

    Given the following example information:

    Solution:

    Sc = 0.33 Su T at minimum installed or operating temperature  = 0.33 * 455.05 = 150.16 N/mm2

    Sh = 0.33 Su T at maximum installed or operating temperature  = 0.33 * 455.05= 150.16 N/mm2

    SL = longitudinal stress calculated according to para 833.6.(a)

    From AutoPIPE on-line help, refer to the sustained stress calculation for B31.8:

      

    Note: this value is already calculated in AutoPIPE as stress results for Gr + MaxP loadcase

    SL = 327.53 N/mm2

    f = Range factor = 1.0 (setting from Tool> model Options> Results)

    Sa = 1.0 * [ 1.25 * (150.16 + 150.16) - 327.53]

    Sa =  47.886 N/mm2 as shown in the output report above.  

    Note: The limit of SL = 0.75 S is for sustained stress acceptance. The actual stress calculated is used by AutoPIPE when calculating the thermal allowable SA.

    See Also

    Bentley AutoPIPE

    • B31.8
    • Piping Code
    • AutoPIPE
    • Calculation
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    • Mike Dattilio Created by Bentley Colleague Mike Dattilio
    • When: Fri, Jan 30 2015 3:48 PM
    • Mike Dattilio Last revision by Bentley Colleague Mike Dattilio
    • When: Wed, Dec 22 2021 10:13 AM
    • Revisions: 5
    • Comments: 0
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