Joint Efficiency for single side weld. 1

[SJEC]

I am working on a mercaptan tank.
As per our client direction, the vessel should not have any manway and inspection hole due to the smelly mercaptan.
The vessel will be replaced every inspection period.

In general, the vessel will be designed per RT-2. JE=1.
The question is what joint efficiency shall be used for close weld. It should be circ weld between head and cylinder.

As per UW-12, Circ weld shall meet spot RT requirement and double side weld. We already add 100% RT on this weld seam. In addition, we can use GTAW for root weld. However per UW-35, it sounds like unless people can inspect both side. the weld can not be recognized as double weld.

Thanks

 

[metengr]

However per UW-35, it sounds like unless people can inspect both side. the weld can not be recognized as double weld.

Where does UW-35 imply the above? Can't you UT the weld and ensure full penetration? The Code does not prohibit this.

 

[SJEC]

See following link Page 5. It may give you more details.

http://www.nationalboard.org/SiteDocuments/Bulletins/SU06.pdf

THX