API Riveted Tank -- Repair of Horizontal and Vertical Seams
API Riveted Tank -- Repair of Horizontal and Vertical Seams
(OP)
I'm reviewing the repair plan for an API riveted tank. The plan calls for the replacement of various shell sections including some intersections of horizontal and vertical seams. The shell is 3/8" CS. I've reviewed 653 and have some preliminary issues with how this replacement would be done. Any thoughts on this would be greatly appreciated.





RE: API Riveted Tank -- Repair of Horizontal and Vertical Seams
Joe Tank
RE: API Riveted Tank -- Repair of Horizontal and Vertical Seams
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RE: API Riveted Tank -- Repair of Horizontal and Vertical Seams
Joe Tank
RE: API Riveted Tank -- Repair of Horizontal and Vertical Seams
I personally think that you should forgo the expensive repair for a new or second tank.
RE: API Riveted Tank -- Repair of Horizontal and Vertical Seams
RE: API Riveted Tank -- Repair of Horizontal and Vertical Seams
One common method is to use a butt-welded insert for the vertical seams and simply lap-weld the horizontal. I have used this detail and it has worked nicely. I utilized the basic rules for lap-welded tanks as discussed in the old Process Equipment Design text.
Another detail that I have used successfully is a butt-welded insert accounting for the thickness of both the lower and upper courses. This can amount to a fairly thick plate, and it requires a welder with a higher skill level, however if done properly it is a good detail. The basic idea is to "split the difference" of the thickened plate taking care to follow typical rules from API-650 for thickened insert plates.
As Joe mentions there are no hard and fast rules in 653 for this type of repair and good judgement must be used. I hope this helps.
RE: API Riveted Tank -- Repair of Horizontal and Vertical Seams
Be careful when weld repairing old tanks...of mysterious metallurgy. How old are these tanks anyway ?
In December 2008, there was a catastropic failure of a large rivetted tank that the federal govenment is currently investigating. The tank was one of three that was recently repaired (by an unknown technique)
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I agree with the comments above....time for a new tank..!!!
Let us know about your final decision
Regards
-MJC
RE: API Riveted Tank -- Repair of Horizontal and Vertical Seams
What product are you storing and tank size?
As previously mentioned, some of the older codes published by API and NBIC are some areas to investigate. Might even look into 12C, a lot of good information there as well.
Prior to any welded repair(s) take place, you may want to get some testing done on the existing material to determine the mechanical properties!!!
Hard to know exactly what you are going through right now, but you should try to replace it if possible if there are major repairs.
If there is no way possible to replace, send some more details and be very cautious of striking an arc on the shell until you can get some additional information.
Hope that helps you.
RE: API Riveted Tank -- Repair of Horizontal and Vertical Seams
RE: API Riveted Tank -- Repair of Horizontal and Vertical Seams