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Hi bimr, no we did not. Good suggestion but we're pretty much set on metal for this section of the piping. Littleinch yeah I know SS sounds a bit rediculous for the application but it's only a small section that needs to be metal. So my line of thought is that if we use sch 10 SS then the total...

Full circle indeed. Butt weld valves with sch 10 pipe seems to make the most sense doesn't it...

Hi LittleInch, we do use PE for the most part. There is a short section we're going metal due to risk of damage. Copper was ruled out as the water is mildly acidic and tends to leach copper, and DICL is only locally available 4" and larger. The line of thought was that socket weld valves are...

Less than 10ppm Cl for sure. The water is roof collected rainwater (untreated) stored in 316 tanks. The site is around 300 miles inland. I should mention that we're not commited to using socket weld. It was more of an oddball idea that I was assessing to see if it had any merit. Sounds like the...

Hi Ed, no Cl. Appreciate the tips on HAZ coloration.

That makes sense, thank you.

Hi folks, the situation is 2-1/2" 316 schedule 10 pipe connecting to "commodity" type CF8M 3 piece ball valves. The proposal is to GTAW with back purge. A couple of general questions if anyone has experience with this: 1. Is pickling required? 2. If yes I'm not sure that the pickling solution...

We're not zinc plating, but that's interesting an acid pickle would remove the burr? John.

I agree, I would always at least take the sharp edge off for safety and paint coverage. We are only talking about hot rolled mild steel here, although if we do go down the folded channel route there's a chance we may investigate using higher strength steels in the future for weight savings. The...

All valid points, appreciate the input. John.

I had always thought slit edge was equivalent to sheared edge, or is that not the case? Edit: sorry Ed just saw your post. Makes sense. John.

Good point Tugboat, we're probably getting ahead of ourselves here. Now that it is established the edges need secondary finishing I will definitely consult with the shop first. John.

Interesting, in my mind the fact that someone went to the trouble of building that machine confirms my suspicion that the sheared edge is indeed a concern. I think we'll do a trial build using folded channels with manually finished edges first. If it proves viable I'll probably look to set up...

I've previously searched in regards to fabricating other parts and haven't found a local shop with water jet capabilities unfortunately. I agree it would be ideal if available though! John.

Dave the material is usually 1/8 or 5/32 thick so if I understand what you mean by hemming correctly (folding it back on itself) that won't work. But I was thinking about adapting a beveling tool to perform an edge shave (rather than a bevel) like you suggest. It would be fairly quick and easy...

No, but always happy to add to my library. Any one in particular you would recommend given the above applicattion? John.

If only deburring the edge is required to mitigate this then it sounds like a quick pass along the edge with a flap wheel or belt grinder could be a possible option? That would be quick and inexpensive. We size the channels very conservatively anyhow so it may not be a huge issue. I just have a...

Hi Folks, Small time trailer builder here. We use off the shelf hot roll formed C channels for crossmembers. The tolerance of these is not the best, especially the squareness of the flanges, which causes various minor issues during fabrication. They are also locally only available in a zinc...