SUPPORT FRICTION COEFFICIENT INPUT

I am currently analyzing a high-pressure steam header line. The steam header has 3 legs, two sliding and a fixed leg at the centre. The legs are welded around the bottom circumference of the header and to a plate at the bottom. And those plates are bolted to another plate below which helps in sliding motion. The bottom plates are fixed to the foundation and top plates aid in sliding the leg in the axial direction only.

Can anyone suggest me how can I model this type of support?
I input the header and insert a rigid beam under the header with supports at the bottom of the rigid beam. Is this correct way? And what should be the friction coefficient of the support?

Thank you

  • Hello Dipesh, 

    Please add a drawing or picture of exactly what you are trying to model. 

    Regards,

    Mike Dattilio
    Bentley Product Advantage Group Analyst
    AutoPIPE Product Line Bentley Systems, Inc.
    ===================================================

    Answer Verified By: Dipesh Khadka 

  •   

    This is the picture of the High-pressure steam header. It contains only 1 leg but rest is similar to this.

    I want to model this into autopipe. The foundation is concrete. The base plate is bolted to the foundation but the leg can move in the axial direction only. 

    This is how I modelled it in the autopipe. I want to know if this modelling is correct and what about the friction coefficient at the bottom of the leg. 

  • Hello Dipesh, 

    Let us look at the bearing spring directions required: 

    • Direction 1: cannot move up / or down
    • Direction 2: cannot move laterally (left or right)  to the pipe  
    • Direction 3 : allow axial movement with the pipe

    In AutoPIPE, open the Support dialog and press the help button

    Using one or more supports how can the 3 bearing directions be modeled:

    Option #1: Guide

    Option #2: Two incline supports. one - vertical oriented, one - lateral oriented

    Option #3: 1 incline support - lateral oriented, and 1 V-stop suport

    Looks like from the screen shot above that you used Option #3. Any of the options 1-3 would work just fine. 

    Regards,

    Mike Dattilio
    Bentley Product Advantage Group Analyst
    AutoPIPE Product Line Bentley Systems, Inc.
    ===================================================

    Answer Verified By: Dipesh Khadka