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Earl   AST Forum  

Radial welds cross tank shell

Tuesday, May 30, 2017   By: ADI HAR-SHOSHAN [93] 4 Stars
When inserting new annular plates in an slotted tank shell ,how does API-653 relate to the new Radial butt welds that cross the under the shell between the annulars with regards to the inspection of this portion?

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Thursday, June 01, 2017   By: Tankee [235] 4 Stars
Are you asking how to inspect the butt weld directly under the shell, how to test it, minimum distances of shell welds, or what? Im not exactly clear on what you are asking.

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Friday, June 02, 2017   By: ADI HAR-SHOSHAN [93] 4 Stars
1. Because you inserting a new annular plate in to a slotted shell and the shell THK let say is 32.0mm thick ,how do you make sure that the portion of the new Radial butt weld that cross under the shell between the two annulars is fully bonded without discontinuties to the rest of the this radial butt weld?

2.Does this cross weld should be prepare for full penetraion weld with the shell ?

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Monday, June 05, 2017   By: Tankee [235] 4 Stars
I do not see where 653 requires a full penetration corner weld anywhere over an annular ring our its butt welds. I f you want to, you can write it into your procedures the bevel a certain amount across the top and on each side of a butt weld, but I see it as unnecessary.

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Wednesday, June 07, 2017   By: davidr@fast.net [39] 5 Stars
NDE the annular plate butt weld prior to sliding them into final location.

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Published on ast-forum.com


Atmospheric Design Pressure
By: Fathi [46]

The whole story is to avoid brittle fracture=

Test temperature shall be equal or warmer than Minimum Metal Design temperature at Test pressure.

I would limit my minimum testing temperature for a tank (or even for a vessel or a piping system) by the =

Temp = maximum of [ Min(lower shell) , Min(shell# 2) ....Min (Upper shell) ]

For a Shell# i the minimum is function ( of shell tickness , Material group ) and this can be found in API 650 , Fig 2-1

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