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AutoPIPE Wiki 23. How to model a blast load in AutoPIPE Vessel
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            • 23. How to model a blast load in AutoPIPE Vessel
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    Q. How to model a blast load in AutoPIPE Vessel

    Applies To
    Product(s): AutoPIPE Vessel
    Version(s): ALL
    Area: Modeling
    Date Logged
    & Current Version
    March 2018
    40.06.00.07

    Problem:

    For a blast over pressure of 1 bar and when we fill in and run the analysis, only see the moment / diagram only vertical direction and not horizontal direction, why?

    Some warnings may appear while modeling  this load case: No. 593 Saddel effective angle < 30Deg (blast int Max P (Corroded inertias) (Corrded Weight), revise design of vessel. 

    why and how to avoid. 

    Solution:

    This is obvious an input of wind drag is necessary for the horizontal blast forces. The blast effect consists of 2 effects - the

    (1) overpressure which you have mentioned

    (2) blast drag.

    Please refer to the youtube techtalk here to understand how exactly the forces are computed and applied to obtain the shear forces and bending moments. 

    In the report the shear loads and moment are calculated in vertical and horizontal transverse directions and vectorially combined to obtain the resultant. See image below for diagrammatic representation for both vertical and horizontal directions:

    The input of the blast drag and overpressure is performed by the user. The dynamic wind pressure is significantly higher than the usual value for a simple wind load analysis. This is a user input and we cannot guide you how to obtain it. Sometimes users perform CFD analysis or hand calculations.

    See WIKI here for details on calculation Errors. 

     

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