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Internal pressure on a pipe made of plates

Internal pressure on a pipe made of plates

Internal pressure on a pipe made of plates

(OP)
Hi!!!!

How can I calculate the minimum thickness with ASME Code of a pipe made of rolled plates? I have a pipe of 20" of diameter and on one side it will have a cap, and the other side it will be open. It will carry gas. I have the temperature: 200 Celsius and gas pressure: 7.5 kg/cm2.
Attached I have a pdf file. I`m considering that with 1/4" inch is enough using A-285 GrC carbon steel. I will feed this pipe from a Inlet in one side (close of cap).

How it is a OPEN VESSEL AND NOT A CLOSED VESSEL, I do know how can I make sure about this thickness with an ASME CODE

Any recommendation for it please?

Roland

 

RE: Internal pressure on a pipe made of plates

Which ASME Code are you referring to?

RE: Internal pressure on a pipe made of plates

(OP)
The difference between the last question and the now , It is that one is a VESSEL with heads, and for this case, you see is a pipe stated in a vertical way, from one side It has a cap (planar) and the other is open in order to LEAVE OUT THE GAS, so I suppose that the design is almost like an ASME CODE, for that reason I`m including it but I do not know really about it....what do you think????

Thks!!!!

RE: Internal pressure on a pipe made of plates

Quote (Saver2008):

...but I do not know really...
I think that sums it up.  Perhaps you didn't hear my question the first time - what ASME Code are you referring to?

RE: Internal pressure on a pipe made of plates

(OP)
Dear TGS4,

I know where you are going to, I think my problem can be solved with Boiler and Pressure Vessel Code....do I need more dont I?

RE: Internal pressure on a pipe made of plates

If the normal internal pressure of your fabrication does not reach 15 psig, then....

It is neither a pressure vessel nor is it a piping system in a ccordance with the rules of AASME B31.1/B31.3 or ASME Section VIII

-MJC

   

RE: Internal pressure on a pipe made of plates

I guess the question comes down to "Is there ANY possible (weird/goofy/startup/shutdown/catastrophic overload condition/unexpected freezing/thawing/melting of polar icecap/plant shutdown in dead of winter with a snow load) whatever time when the "gas" either might not be a gas (but a liquid or slushy combination) or might be subject to ANYTHING other than atmospheric pressure?  

If you can honestly answer "No - My situation will NEVER be a liquid and my gas can NEVER become trapped in the vent tube and become pressuriaxed" then your problem become a structural one of resisting the static loads of the open-ended steel pipe and the wind loads from the outside of the pipe.

How long (tall!) is your proposed vent pipe?  

Have ALL of the structural engineer/support engineer/foundations engineer/fluid flow engineer/process engineer in your project reviewed your proposed vent pipe?  (They are on your "team" for a reason = They know their fields better than we do, they know your project better than we do!)

Will you ever face earthquake or wind or hurricane loads?  

Will you ever face a "sudden rush" of your gasses that will cause the equal of water hammer or shockwave impacts?     

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