136 PIPE xxx : exceeds standard (diameter = xxx mm, thickness =.. error message in AutoPIPE Vessel


The following message appears in AutoPIPE Vessel's report 

136       PIPE xx.xx : exceeds standard (diameter = xx mm, thickness = xx mm).

Why and how to avoid it?

Answer: 

There can be a number of reasons why this message may appear, see the following scenarios with resolutions (one or more may apply to your model).

Scenario #1: 

136       PIPE 31.05 : exceeds standard (diameter = 112 mm, thickness = 24 mm).

  1. With any message, always review other Warning / Error messaged to see if there are any related messages:

    • Summary of Errors and Warnings.

      No.      Explanation            ( the number is used for technical support)

                  Error (s) :

      136       PIPE 31.05 : exceeds standard (diameter = 112 mm, thickness = 24 mm).

       

                  Warning (s) :

      825       CYLINDRICAL SHELL (01 31.05) UNDER INTERNAL PRESSURE: t>Ri/2 ==> ASME VIII Div.1 Appendix 1-2 (Thick Cylindrical Shells) has been applied.

      985       GEOMETRY (31.05): The diameter type is not compatible with a Standard Pipe, this can lead to unexpected behavior. Select a Nominal Diameter or change the product type of the material (e.g. a plate instead of a pipe)..

      1033     GEOMETRY (31.05): No matching thickness / schedule found, see available schedules from dimpip.xlsx file.

       
    •  
  2. Review output report - "Element(s) of geometry under internal pressure> Cylindrical shell under internal pressure> Shell (01) : 31.05 (Barrel)"
  3. Review Model data for the referenced component (ex. 31.05)
  4. Material Tab:
The development team determined the root cause was inconsistent user data, signaled by warning message 985 (The diameter type is not compatible with a Standard Pipe, this can lead to unexpected behavior). This is the most important message in fact.

Since the code standard does not have any pipe with an internal diameter of 112 mm and a thickness of 24 mm, this also generates another message 1033 (No matching thickness / schedule found).

Since a Pipe is always defined by either a nominal diameter or an external diameter, the calculation was performed considering 112 mm as the outer diameter (Report).
However, when combined with a thickness of 24 mm, the thickness clause in appendix 1-2 applies (side effect).

If the user does not want to enter a nominal diameter but wants to keep a "Seamless Pipe" material, the program will manage to do the verification with the correct dimensions, but it will not be able to determine the schedule. The best solution is to input the nominal diameter for a Pipe.
 
It is impossible to obtain consistent results with inconsistent data. Thus, this would not be considered a programing issue. All the information is in the messages, the error message is just the consequence of the warning messages. In this case, one should first try to resolve the warnings before the errors.