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AutoPIPE Wiki 05. When designing based on GOST code where a nozzle joint efficiency of 0.9 but in the report the joint efficiency is considered as 1. When running the same model changing the design code to ASME, the report shows joint efficiency=0.9, Why?
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            • 01. Local loads due to a nozzle in WRC 107/297: Why is the weld joint efficiency equal to 1 in AutoPIPE Vessel?
            • 02. Does AutoPIPE Vessel allow user defined weld joint efficiency input?
            • 03. Is it possible to enter user-defined joint efficiency in AutoPIPE Vessel?
            • 04. How are joint efficiencies determined in AutoPIPE Vessel for ASME Sec. VIII Div.1?
            • 05. When designing based on GOST code where a nozzle joint efficiency of 0.9 but in the report the joint efficiency is considered as 1. When running the same model changing the design code to ASME, the report shows joint efficiency=0.9, Why?
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    05. When designing based on GOST code where a nozzle joint efficiency of 0.9 but in the report the joint efficiency is considered as 1. When running the same model changing the design code to ASME, the report shows joint efficiency=0.9, Why?

    Answer: 

    The setting for the nozzle joint efficiency for eg. nozzle 'D' in question is as follows in the nozzle dialog box:

     

    As shown above the joint efficiency has been set as 0.9.

    In the report it is 1.0:

    This is because ASME and GOST have different rules with respect to nozzle joint efficiency. See the paragraph from GOST below:

    Hence following the rule above:

    1. The value of phi = 1, since the distance of the nozzle outer from the right tangent line (X) is more than 3s  for nozzle D:

    2. For the value of phi1, following the rule above (refer to the sketch in the GOST paragraph above), the long seam weld of the nozzle neck made from plate is assumed to be beyond 60 deg from the longitudinal seam weld of the shell. This is programmed into the software assuming good practice and user unfortunately cannot change this value hence phi1 is always 1.

    If for example the nozzle D is shifted very close to the right tangent line and a self reinforced nozzle is used such that the outer surface of the nozzle is less than 3s distance from the right tangent line, the value of phi in the report is considered 0.9.

    • GOST
    • ASME
    • nozzle joint efficiency
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    • Sudip Ganguly Created by Bentley Colleague Sudip Ganguly
    • When: Thu, Sep 3 2015 12:56 PM
    • JamieP Last revision by Bentley Colleague JamieP
    • When: Tue, Aug 25 2020 4:01 PM
    • Revisions: 6
    • Comments: 0
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