</colgroup

Applies To
Product(s):	AutoPIPE
Version(s):	ALL;
Area:	Combinations
Date Logged & Current Version	Sept 2024 24.00.01.152

Problems:

Issue #1: In the "Code combination," LONG and HOOP can be included as a load case. What is the approach to incorporate the same LONG and HOOP in the "Non-Code combination"?

Issue #2: There is a need to observe the pipe movement for each code combination. How to replicate the Code combinations as Non-Code combinations for the purpose of analyzing Displacement?

Solution:

 

Please note the difference between these calculations, (as you may already know but worth repeating):

Code combinations -

• • • Combinations are assigned to a category which are linked to the type of code equations applied.
    • Each equation category has a calculated or user allowable with which the code equations are compared too. 
    • Parts of the code combination can be defined as Stress or Moments. Thus, being applied to the moment of the code equation or being added to the code equation.

Non Code Combination

• • There is no option of adding Category type maximums to the Non-code combinations

    • Category	Description
      (Long)	Maximum longitudinal pressure stress considering all operating cases. This is usually required in a combination defined as either sustained or occasional.
      (Sus)	Maximum sustained stress. This is usually required in a combination defined as occasional. This category will usually contain (Long) also.
      (Exp)	Maximum expansion stress.
      (Occ)	Maximum occasional stress.
      (Hoop)	Maximum hoop stress considering all operating cases.

    • No allowable is available / specified. 
    • No option to specify category equations to use. 
    • No option to specify if a case is added to the Stress portion or Moment's portion.
    • Values of Non-code are subject to type of analysis, Linear or Non-Linear. Recall that Non-Linear considers Gaps, friction, soil properties and in addition load sequence settings. 

With that said, you had mentioned that you wanted to add (hoop) to a non-code equation. As seen above, (Hoop) = Maximum hoop stress considering all operating cases. Most likely the pressure load case to cause the highest Hoop stress would be the largest Pressure in a pipe with the smallest wall thickness. After you identify the pressure load case that does this, then you can add that pressure case to the Non-code combination. Can you see how impractical this goal might be? 

In summary, Code and Non-Code represent fundamentally distinct categories of equations. While it is possible to attempt to replicate Code combinations using Non-Code combinations, it is essential to consider the entire Non-Code operating condition rather than focusing solely on a single load case. Individual load cases serve merely as a tool for comprehending the overall operating condition results. 

For Non-code combination, suggest to configure all of your operating conditions and review the results for how the system responds.