Low Nozzles Violating API-653 Weld Spacing
Low Nozzles Violating API-653 Weld Spacing
(OP)
Does anyone have any advice regarding steps to take when evaluating new shell nozzles that have been installed in a tank and that do not meet current API-653 weld spacing criteria?





RE: Low Nozzles Violating API-653 Weld Spacing
Would be interested in others comments too...
RE: Low Nozzles Violating API-653 Weld Spacing
Joe Tank
RE: Low Nozzles Violating API-653 Weld Spacing
The tank has already been hydrotested and sits on a concrete ringwall. The tank is 42'-6" Dia. x 45' High, 3/8" tub ring thickness. The material is unknown.
The insert nozzles range from 4" to 12" diameter.
RE: Low Nozzles Violating API-653 Weld Spacing
RE: Low Nozzles Violating API-653 Weld Spacing
If the tombstomes are thickened inserts, you can consider the "C" dimension (only 3"), not the "D" dimension. Check out the footnote on the S-N detail.
Notwithstanding that option, there is an old API-653 inquiry that addresses the sad case of finding a problem with weld spacing after the hydro was completed. I believe that API answered it as possibly being okay without repair. Check that out and see how it works.
IFRs,
I don't beleive that 9.10.2.7 applies directly, but I like the tangential thinking on your part. That's the kind of open-mindedness that your clients respect. A star to you.
Joe Tank
RE: Low Nozzles Violating API-653 Weld Spacing
If the tombstomes are thickened inserts, you can consider the "C" dimension (only 3"), not the "D" dimension. Check out the footnote on the S-N detail.
RE: Low Nozzles Violating API-653 Weld Spacing
Joe Tank