Pipe Stress Analysis Procedure


Piping Stress Analysis in a typical engineering project is carried out using softwares like CAESAR II. The procedure adopted normally is as follows :

  1. Based on stress design criteria, stress engineer prepares stress critical lines list.
  2. Stress Engineer gives it to layout engineer.
  3. Layout engineer makes sure that lines are routed in 3D Model assuring enough supporting structure is available for the line.
  4. Layout engineer marks logical supports on line in 3d Model at all locations where it is possible to provide a support.
  5. Layout engineer then extracts isometrics, check it routing point of view with all components placed as per PID.
  6. He then issues isometrics to stress engineer.
  7. Layout engineer keeps track of isometrics issued to stress in a copy of stress critical lines list by adding extra columns to track stress progress.
  8. Stress engineer marks node numbers on stress isometrics.
  9. Stress Engineer  then inputs the line data in CAESAR using classic piping input spreadsheet of CAESAR II.
  10. Stress Engineer  adds preliminary supports based on judgement and experience.
  11. Stress Engineer  then runs the static analysis.
  12. Stress Engineer  then checks the stress reports for :
    1. Excessive displacements.
    2. Nodes exceeding allowable stresses.
    3. Excessive loads in equipment nozzles.
    4. Excessive loads on dynamic equipments like pumps, compressors, turbines etc.
  13. If stress engineer finds everything ok, he finalises supports and give back a copy of stress isometrics with support markup to layout engineer to incorporate those supports in 3d Model.