Are they shooting the welds on that line if so have you failed before is he a welder or just thinks he is lots of QC guys have zero real world on the job time to speak of imho. The last job I was on in Wyoming the QC told me that I could get some lohy "7018" that I could weld in the wind with zero porosity and preheat was a wast of time and money 5 degrees and 30 to 60 mph winds so maybe look at it like water on a ducks back.
Wow! I live/work in Wyo. I bet the welders would love some of that rod! That guy obviously needs to learn more. Even in the early mornings in the Summer time we have to pre-heat. Normally 7018 welders are inside a shop/building. Just the thought of using lo/hy in the wind gives me nightmares.
I think he is out of his mind in sch 40
4 passes maybe sch 80
one, you would have a cap sticking up to high with four single passes even with all 1/8 that would not meet api 1104 code
I just did over fifty 6 inch sch 40 1/8 root 1/8 hot pass and cap it with 5/32 all down hill welding and bent them not only in the api bend test but bent them further with the asme bender and did not have any failures in 5 and 6 g positions the fill was all the same you only have so much space
I found in the 6 G position a one bead cap work much better for me then a two bead stacking cap same in the 2 G rotating the pipe one bead cap up side down d-whip worked in that one still 3 passes
I ran a 24 inch 1/2 wall 1/8 root 1/8 hot 5/32 two fills and a 3/16 cap 5 total passes to completion, did it in the brother in-law style and again came out great. just my experience so far I still look forward to welding a whole lot of pipe in the future I Know for me pipe is my favorite!!
Sch 40/Standard Wall 3 inch is 0.216 WT. After a bead and HP there is not much left for a cap. 1/8 bead and HP and a smoke ring cap and it is over flush. It would be hard to put a 1/8 inch high cap with a 5 on that thin of pipe unless you were running really slow. Four passes on 3" SW is overkill.
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