Nozzle Reinforcement

[Richard1977]

Hello I am designing a pressure vessel on saddle supports with nozzle at shell and heads. The nozzle is located at knucle region of the torispherical head. I´ve calculated the nozzle geometry and it don´t need a reinforcement but my question is: Is there a section on the code that suggests nozzle reinforcement when it is located at knuckle region of the head ?

 

[DSB123]

Richard1977,
The knuckle region of a vessel is highly stressed and placing a nozzle in that region is not recommended. In fact PD5500 does not allow a nozzle to be placed within the knuckle region and specifies a distance within which a nozzle is not allowed.

 

[MJCronin]

Ricky...

DSB123 is correct. The knuckle is the weakest part of the head

A nozzle in the knuckle is a bad idea -- this is banned by PD5500 but, to the best of my knowledge, ASME is silent.
about this.

This has been discussed before

http://www.eng-tips.com/viewthread.cfm?qid=276049&page=1

http://www.eng-tips.com/viewthread.cfm?qid=264450&page=11

http://www.eng-tips.com/viewthread.cfm?qid=127987&page=1

and studied elsewhere..

http://journals.pepublishing.com/content/pl64572657652356/

You might be able to justify your configuration with FEA

-MJC

 

[Luki85]

Hello. In PN-EN 13445-3 in section "7.7 Nozzles which encroach into the knuckle region" are informations aobut weakened in knuckle region. But rules are recommendet for Kloepper and Korbbogen ends.