Cone junction reinforcement as per ASME Sec VIII Div 1

[senthil83]

hi,
we are analyzing a vertical vessel of diameter 8400mm with height 26000mm, supported by skirt and cone section at bottom,

while checking the junction of cone to cylinder at skirt location, we are doing reinforcement calculation as per ASME Sec VIII div 1 appendix 1-8 for external pressure (Vaccum).

while doing this is it require to consider the weight of liquid filled in vessel while doing reinforcement check for external pressure.

since the hydrostatic head of liquid inside vessel is higher that external pressure (vaccum).

IS it ok to check the reinforcement of vessel under external pressure considering only empty condition?

br
senthilkumar.B

 

[saplanti]

You need to talk to the process engineer. In case you work with specification and the specification gives you Int. Pressure/Vacuum for the design you cannot consider the fluid in the vessel for vacuum design. In case it is confusing, not clear ask for clarification.

 

[SnTMan]

Agreed, senthil83 you need to find out what's going on. If the liquid weight is present during the external pressure condition you'd have to account for it.

Regards,

Mike

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

 

[Some Curious Guy]

Full Vacuum is a design condition. Actual operating condition might be partial vacuum where operating fluid may be present inside the vessel. For conservative calculation you need to consider weight of the liquid in such cases. Full vacuum is also specified to take care of any oversight during steam out procedure. In this case you can neglect the operating fluid weight for practical purposes. Hence find out from the Plant personnel or the process engineer the purpose of providing full vacuum as a designing condition.
If you a designing a new vessel do not cut corners at the design stage to save material. All sort of unexpected stuff happen during project execution and you need some design margin to take care of that. That's my opinion.

 

[SnTMan]

As my old boss used to say "A little extra steel is cheap insurance"

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

 

[r6155]

Are wind and seismic applied?

Regards