Re: Flat end for piping in creep range

From: <Gang>
Date: Sat Apr 30 2005 - 08:24:00 EDT

Dragos,
I am not an expert on the stress and strain behaviour; but still, there is good sense in selecting a smooth transition of profiles, from pipe to a contoured welding cap. The stress distribution is transferred from a radial pattern to an axial mode.
In the context of a plate end closure, the weakest section is the joint itself; thanks to the care taken in executing the welding. Since a lot of risk is involved in case, such a joint bursts, the results could be catastrophic. And that is the reason plate end closures are not recommended for high-pressure applications; the least is said about the CREEP zones. The performance of a stress relief groove is anybody&#8217;s guess!
Regards.
C. V. Gangadharan.

• Dragos Aron <daron@oltchim.ro> wrote:

> There is anybody on the list fron Europe?
> I have an question refer to EN 13480-3:2000. Why the
> flat end with a stress
> relief groove is prohibited for piping in the creep
> range (7.2.3.4)?
>
> Best regards,
> Dragos
>
>

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