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Pipe bending 101 - Page 56

post #551 of 2160
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Quote:
Originally Posted by mandrix View Post

Quote:
Originally Posted by B NEGATIVE View Post

Its already been demonstrated earlier in the thread,3/8" is not watertight with 10mm pushfits

Like I said, if it doesn't leak, it's watertight. If it does, then it's no good. No one is disagreeing here, I think. I just wanted to know what size tubing the guy was using in the pic.
I would not think it would work, but there is a lot of unexplored territory here with different manufacturers and possibly different tolerances/materials in the o ring area. I have yet to see a comprehensive list of push fittings tried with 3/8" tubing. Have you?
Quote:
Originally Posted by S3ason View Post

The more I look at the 3/8" tube I bought, the more I think its too small, especially in the bends. I think I'll be moving to 1/2".
Not understanding what you mean. If it's bent properly, the diameter of the pipe isn't changing in the bends.
I thought about 1/2" too, but decided for me the bend radius would be too large for what I will need to do. If you really think you need a lot of flow, or if 1/2" just looks better for you, then go for it.
In the end whatever works best for you.

On another note, I was looking at the Mettleair fittings last night and noticed there is a provision for tightening internally with a hex , or allen wrench as we call them in US.

There is no unexplored area,push fit requires the correct pipe to be used,if 3/8 worked with 10mm pushfit they would market it as such.
Would you use 11/13 tube with 10/16 compressions? No,you wouldnt.

The tolerances are exacting with this type of fitting,many years as a plumber has taught me this.

By all means test what im saying but the result is a foregone conclusion.
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post #552 of 2160
Quote:
Originally Posted by voldomazta View Post

The copper one is 10mm OD and the chrome one is 3/8" OD. I was playing around with sizes to experience them for myself. One thing I noticed t hough after I had the 3/8" pipe plated the MettleAir fitting is having a hard time bite into it. It's now easier to pull it off even without pushing the blue lock compared to when it was just a bare copper pipe.
OK. I'm not having that problem with the chromed copper. I did the same as I did before with the soft copper pipe, pushing/pulling/twisting to try and make it leak. I guess it just shows the limitations of those fittings. For whatever reason the fittings are getting a better bite on this particular tubing I have. I have some speculation on why that is, but I can't state for sure.
But after all, the fittings are marketed for soft tubing so we were bound to hit the limit sometime.
post #553 of 2160
Im not familiar with metal tubes in push/fit fittings. But I do work with rigid plastic pipes and 200psi air in push/fit fittings every day.
My guess is that plating a pipe will make it slightly thicker and increase it's diameter. Maybe to the point where a 3/8" (9.5mm) pipe become a 10mm OD. I just don't know. Also, plating it should make it smoother and harder to grab on for the fitting.

I know when a plastic tube refuses to latch on, we give it a very light sanding, very very light. And that usually suffices to provide a good grip and seal, so long as you dont sand it to the point of reducing the OD, but enough to make it just a little less slippery.

But hey, maybe my experience does not translate to metal pipes, I'm just saying, I'm not saying.
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post #554 of 2160
Okay crazy idea, how about covering the edge of the pipe with some tape or the like before having it plated, this way, after the plating that area which gets inserted into the fittings is still bare copper? Would something like that work?
post #555 of 2160
Plating shouldn't affect the diameter significantly. The maker of omega desk had his pipes played and had no issues.
post #556 of 2160
Quote:
Originally Posted by S3ason View Post

Plating shouldn't affect the diameter significantly. The maker of omega desk had his pipes played and had no issues.
Yep. I doubt the plating is more than a few microns thick anyway.
But these particular fittings - Mettleair - are made for pneumatic applications and are sort of an unknown. All my testing has proved out but I've yet to actually put any in a loop. Mine seem to get a good bite on the chromed tubing, but for whatever reason they are not on his nickel plated tubing.
I don't consider them an ideal solution, just a cheap one. I'll be trying them out in parts of the loop less likely to destroy something if they leak, and rely on the Koolance fittings in more sensitive areas for now at least. I've got plenty of real estate to spread things out...
post #557 of 2160
I found another brand of fittings called Swagelok earlier. They had every size and configurations you could want. The ones I was looking for (1/2" tube, 1/4 thread), were about $6.58 or something like that. Ebay has lots of listings for many different fittings but very few of what I was looking for.
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post #558 of 2160
Bent up some more pipe for my build. Its all starting to come together!


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post #559 of 2160
Looking good!
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post #560 of 2160
Something that didn't dawn on me about the Koolance fittings until I had to disassemble some hard pipe yesterday.
Since the fittings swivel, you can just unscrew them from a block without disturbing the ferrule. So for anyone worried about having to remove/replace the ferrule every time you want to disassemble the tubing, as long as you can unthread the lower portion from the block or whatever it's threaded into you don't need to disturb the ferrule at all.
Some thin pliers with tape or other suitable padding will keep the fitting from being scratched. I've thought about gluing split pieces of leftover soft tubing to my pliers to add some padding, as tape doesn't hold up very well.

So, maybe not as quick and elegant as push fittings, but for those wanting to use 3/8" or 1/2" pipe/tubing instead of metric, the Koolance fittings work out pretty good and look fairly decent, IMO.

Also I'm happy to report that the little bender I got from Lowes is working out well with the 3/8" chromed copper tubing.
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