Interpretation of stresses at points

Thank you for your reply,

I would like to clarify, though.

Analyzing code stresses for the previosly mentioned pipe:

I understand that point S20 F+ and S21 N- refer to the pipe between them.

I assume that code (EN 13480 in this case) stresses for the combination GR + Max P{1} are calculated using:

And are a single value for the entire pipe, as the code considers elements as a whole, unlike general stresses which can be found also for intermediate points.

Am I right and if so, why are these values (shown above) slightly different? Is it because of the precision of AutoPipe calculations?

Kind Regards,

Piotrek

Proen

Greetings Piotrek, 

What could be different between these 2 points that would affect the sustain calculations?

With out being able to review the actual model, one should be able to assume that the following would be the same between the 2 end points of a bend component:

• Pc = defined pressure
• do =  Outside pipe dia
• en = nominal thickness on drawings
• i = Sif calculation
• Z = section modulus for a pipe

However the following could be different:

• Ma = resultant moment from the sustained mechanical loads

This would explain the difference in the reported results. 

Regards,
Mike Dattilio
Design Analysis Engineering Group
Senior Analyst Bentley Systems Inc
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Dzień dobry,

Miałbym pytanie o to w jaki sposób te punkty, jeżeli wystąpią, będą oznaczone?

Pozdrawiam,

Piotr Łukowicz

Witam,

Zostaną dodane do raportu pomiędzy punktami węzłowymi. Zapraszam do kontaktu bezpośrednio będzie szybciej łatwiej.

In English on request of Mike: These points are added to the stress report if stress in between regular model nodes, if necessary only. Stress is calculated for interim points but isn't reported if it isn't necessary, i.e. isn't bigger than in boundary nodes of element.