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ITS on Tank shell replacement procedure

By: ITS [1678] 3 Stars
Date: Thursday, May 25, 2017
Time: 2:30:25 PM

That is a problem and the additional information is better.

The distortion of the adjacent shell plate and plates seems or gives the impression that uneven control of heat as a result of sequencing or something else. Also, it might need only a simple fix. The condition also give the impression the WPS may need adjustment or work too or at least a review. It may not mean it is an essential variable required by the welding code Section 9.

The distortion give the impression it may simply be a weld joint sequencing issue where a review might be needed. A professional on-site is needed for sure.

Ship builders have in the past had similar problems. Their solution was employing the Egg-Box Method of weld sequencing. Basically, this requires a layout of all weld joints say on paper and then mapping out the sequence and their lengths with starts and stops. You may need significant tack welds to assist to start with. Experience is everything here!

The Egg-Box Method works something like this, but applying it here is not exactly a good fit since you are staggering the plates. In general, do half of the lower horizontal weld joint of one plate starting from the center, then do the next adjoining shell plate horizontal the same way, then repeat this on the top shell plates above them, then weld the vertical completely between them the lower two. Then repeat. But remember you are only doing two shell course between existing shell course.

You may have issues that you have not shared or conditions that are unknown that may contribute to the problem. But, this additional knowledge may help in finding a solution even if the egg box method is not the solution.

It is good to read that the parameters such as plumbness, peaking are in the standard range.

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