pressure vessel thickness calculation

[shahabemk]

Dear all
I am checking the design calculation of a pressure vessel.
The calculation sheet is attached. I can,t understand how 18 mm is selected as minimum thickness after forming.
Would you please help me?
shahabemk

 

[SnTMan]

shahabemk, not enough there to say anything definite. Bassd on the calculation you've shown it does seem the shell could be thnner, but loadings other than pressure (wind, seismic) may be important.

Or, the thickness may have selected based on convenience.

Regards,

Mike



The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[rb1957]

maybe that's the plate they've got on hand, or easy to get ?

another day in paradise, or is paradise one day closer ?

 

[LittleInch]

Well given the type face and the fact that this is clearly from a punched bit of paper, it would appear that the vessel is quite old ( 20+ yrs?)

Quite why you're checking it now is curious, but there's nothing wrong with a bit more steel.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[SnTMan]

Cheap insurance

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[JStephen]

Possibly due to compressive stress if a tall tower, or increased stiffness for vibration, or to omit or simplify repads on nozzles, for external pressure, etc.

 

[saplanti]

In case the actual corrosion exceeded the allowance the owner might need to ask engineer should the vessel is still adequate for the purpose. Do you have the the corrosion map in hand to be able to verify the vessel if this is the question?

 

[farrellnoid]

Probably the nearest supplier plate thickness available after calculation.