Please offer your opinion 1

[FTank]

If you are in possession of a draft copy of API 650 Proof 1 January 2007 - refer to:
3.1.5.2 under Vertical Shell Joints par b. - "shell courses shall be flush-stacked on the inside"
3.1.5.3 under Horizontal Shell Joints par b. - "abutting shell plates at horizontal joints shall have a common vertical centerline"

Question - do you find these paragraphs contradictory?

 

[JStephen]

If 3.1.5.2 is talking about alignment at a vertical joint where one plate is thicker, and if 3.1.5.3 is talking about alignment of one course above the other, I don't see a contradiction. It might help to reword things to make it more clear, though.

 

[FTank]

JStephen:

Thanks for your response.

Do you design tanks with shells of different thicknesses within the same course?


FTank

 

[JoeTank]

You might want to look at Proof #2 then re-ask your question. Maybe something has changed.

Joe Tank

 

[JStephen]

I think I mis-read the original statement, which says "courses" will be aligned- I was thinking "Plates will be aligned". And yes, that would be a contradition between the two sections.

Application where plates in a course vary would be flush manway insert plates under older version of the standard.

 

[doct9960]

I agree with Joe. Have a look at API 650, 11th edition Draft 2 Dated May 2, 2007 (Proof 2) in here (Note: The pdf file is about 27 MB so it may take some time to download)...

http://committees.api.org/standards/CRE/scast/refdocs/docs.html

There were a lot of changes.

 

[FTank]

Thanks to all who replied. I have reviewed the 2nd draft as doct9960 suggested and the reference to flush-stacking has been removed.