Question:
When analyzing a model in AutoPIPE Vessel the following Error number was reported.
855 HEAD (xxx) UNDER INTERNAL PRESSURE: (beyond the scope of application according to EN 13445-3).
Why and how to avoid it?
Answer:
There can be any number of reasons why this massage may appear. Review the following known solutions:
Solution #1:
Per code EN 13445-3:2021, Figure 10.4-5 — Values of coefficient C2 (imaged below)
In order to derive a value for C2, one must reference a specific curve based on the results of es/Di.
From a specific model (imaged below), es/Di = 5.49 / 77.92 = 0.07
Largest value curve on Figure = 0.065, therefore this figure cannot be used to find a value of C2.
Solution, make necessary modifications to the design such that (es/Di) is within the limits of Figure 10.4-5