Pressure thrust at flexible joint

Hi,

I have modelled a flexible joint in a DN800 line with:

axial (X) / Y (lateral) / Z (up) = 100 N/mm

The axial movement to be absorbed in the piping is around 50mm in the overall length of 21,000 mm

How do I define the joint to achieve this? Or is this possible? 

Also, when I input the pressure thrust area, the loads on the turbine nozzle (located at horizontal Y=5000 and -Z=1000) goes very high!

Please advise.

  • Good day to you Manoj Kumar, 

    You have identified how much movement is to be absorbed by your flexible joint. Suggest that you contact your Flexible Joint supplier to ask them which joint is best suited for your application. 

    The Flexible Joint manufacturer will provide you a cut sheet on the joint of their suggestions. Model the flexible joint with the values from that cut sheet in AutoPIPE. then work with the joint manufacture to make adjustments as needed. 

    Pressure thrust is a very serious issue in piping, especially when modeling Flexible joint. Be sure to enter the weight and pressure area of the joint being used. Yes this pressure thrust will be transferred down the pipe to the first restraint and / or elbows. You may consider modeling a tied expansion joint, see AutoPIPE help for more information on modeling this type of joint. However exerciser caution in modeling the correct joint being purchased.

    Regards,

    Mike Dattilio
    Bentley Systems Design Analyst
    Design Engineering Analysis group
    ===================================================

    Answer Verified By: Manoj Kumar