AutoPIPE Vessel - Tank Bottom Plate & Annular Plate Dimensions

Hi,

I just wanted a quick discussion on the input of Tank Bottom Plate diameter and Annular Plate measurement. My main question is: are these supposed to overlap in the model? Under bottom plate entry it asks for the "Internal diameter" dimension. Then under the Anchor window it asks for the Annular plate dimension, which, in the sketch beside the data entry it says that this length can extend past the internal diameter of the tank?

In my picture below if I enter the Annular plate dimension as 84 and internal diameter dimension for the bottom plate as 4572 i get an error for the annular plate being too small?

So how are we best to model this situation?

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Offline gogu gigi Sun, Dec 6 2015 1:46 AM

Actually your annular plate should extend beyond the shell inside the tank as pictured below ( just an informative picture , you actually have to calculate the width of the annular plate by API 650 ):

As for the picture of the anchorage of the bentley vessel , i think it's a generic picture meant more for the cone skirt and i think it should look more like this :
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Offline Hayden Lewis Sun, Dec 6 2015 6:21 PM in reply to gogu gigi

Sorry I didn't say in my initial post that the base plate and annular plate on my tank are all one as in your second picture so I was trying to find the best/correct way to model this.
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Offline Hayden Lewis Sun, Dec 6 2015 6:21 PM in reply to gogu gigi

Sorry I didn't say in my initial post that the base plate and annular plate on my tank are all one as in your second picture so I was trying to find the best/correct way to model this.
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Offline gogu gigi Mon, Dec 7 2015 9:45 AM in reply to Hayden Lewis

In the picture taken from Bentley vessel , the one with the bottom plates, i think that it should ask for External Diameter and not for Internal diameter. Maybe someone from Bentley could shed some light.
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Offline Sudip Ganguly Tue, Dec 15 2015 12:15 PM in reply to gogu gigi
Regarding the Annular Plate:
The user can input a reduced length of annular plate in the Anchor dialog (84mm), but this is not conform to the API so an error message will be printed out in the report (see: Bottom Plate verification).
But the anchor calculation should be done without problem.

Regarding the Bottom Plate:
The field for diameter can be renamed “External Diameter” or “Diameter”, “Internal Diameter” could be misleading for a circular plate, but this is just the name, it does not impact on the calculation.
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Offline Hayden Lewis Tue, Dec 15 2015 2:40 PM in reply to Sudip Ganguly

Thanks Sudip,

My set up is with the Annular Plate/Base Plate as one in the same where 4740mm is the OD and 2370mm is the radius.

So from your response, can I say the way I originally modeled my Tank with the values as I have done in the screen shots "Annular Plate [A]": 2370mm and "Internal Diameter": 4740mm will give me the closest realistic analysis?

Am I correct in thinking that AutoPIPE Vessel looks at the Annular Plate and Base Plate in separate calculations and dimensions give in each (even though overlapping) will give the best result?
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