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Are 90 degree Elbows OK? - Page 2

post #11 of 24
Thread Starter 
Quote:
Originally Posted by Martinm210 View Post
These are probably the next best thing to copper 1/2" elbows, sweeps would be even better, but the copper elbow is extrely low restriction also. We're talking like no more than 4" of tubing...so very very low restriction.

These 3/4" brass elbows have a nicely machined radius on the interior. I think they are the best thing you can buy commercially that comes with hosebarb ends. A little oversized, but easily done by stretching the tubing with some plyers before hand:

http://www.pexsupply.com/categories....D=546&brandid=



You can find these fairly redily at alot of home improvement stores if you look for them. 3/4" brass elbow...

I would avoid the nylon types if you can. It's not alot of pressure drop compared to a waterblock, but it can be avoided...so you might as well avoid it...
I use the 7/16 ID tubing, but wouldn't have thought I could fit it around 3/4 copper barbs. So you're saying the stretch tubing by pulling with plyers or opening plyers inside of the tube to stretch it? Is that along with heating the ends? Seems like a lot to stretch, but I'll go buy a fitting today at the store and practice with some old tubing.
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post #12 of 24
boil the tubing ends in water or use a heat gun and a bit o' spit (silicon grease works well) and you should be able to get the tubing over a 3/4" fitting
    
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post #13 of 24
This is a copper tubing sweep..I'd use a 3/4" one like Martin was suggesting...You can get your tubing over it with a little work, you might want to flare the ends of the fittings a little to better keep the tubing on it, stick some needle nose pliers in it and wallow it out a little if you don't have a tubing flare tool, sand any sharp edges off...


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post #14 of 24
Quote:
Originally Posted by losttsol View Post
I use the 7/16 ID tubing, but wouldn't have thought I could fit it around 3/4 copper barbs. So you're saying the stretch tubing by pulling with plyers or opening plyers inside of the tube to stretch it? Is that along with heating the ends? Seems like a lot to stretch, but I'll go buy a fitting today at the store and practice with some old tubing.
Plyers on the inside, I used to just use needlenose like this:


Now I have a pair of wire stripping plyers I use that have a radius on the ends and doesn't mark the tubing at all.
These are the plyers I like to use now:

It's amazing how well using this plyer trick works. You don't even need to do any heating.

These brass 3/4" barbs are more like a 5/8" (.625') barb than they are 3/4 (.750"). They measure an actual (.660" maximum OD, machined .536" ID). For whatever reason brass sizes run much smaller than nylon. 1/2" brass fitting is actually more like a 7/16" fitting. I was alway looking at brass 5/8" fitting, until one day I found these and decided to try them, especially after looking down the inside of one. The machining mill that's used is a full radiused bit, so it's a nice rounded bend. Not quite as round as a copper elbow, but pretty good, and much more precisely made than the copper types.

These brass 5/8" fittings are a little more work to put tubing on than using the custom copper ones I was making, but not bad at all. I have the T versions in my system and I've also got 1/2NPT nipples for my testing reservoir, so I regularly put 7/16" ID x 5/8" OD Masterkleer on them. You can even polish them up nice if you wanted to.

I still have these in the T variety in my loop...of coarse I had to polish them first though..
    
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post #15 of 24
Thread Starter 
I've got it then. Thanks for all of your input everyone. The metal barbs look so much better in a rig anyways. I'll put up some pictures of my new loop next week. I'm going to look for a metal T as well after seeing those Martinm210.
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post #16 of 24
Hey they stole my pic, they reneged on me......Those barbed ones Martin was showing you look better anyway if your concerned about the looks...
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post #17 of 24
Thread Starter 
I went and got a 3/4 brass pex T and tried it out. It was smaller than I thought it would be. Not a bad fit at all in the tubing. Seems the 3/4 brass is smaller than the 3/4 copper fittings. I bought a 3/4 brass pex elbow as well, but I'll try not to use it if I don't have to. Martin, when you were saying it is no more restrictive than 4" of tubing, what did you mean by that? If I can make a curve with less than 4" of tube will it be better than using that elbow?

Also, did you use zip ties for hose clamps on those T's in that picture?
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post #18 of 24
Quote:
Originally Posted by losttsol View Post
I went and got a 3/4 brass pex T and tried it out. It was smaller than I thought it would be. Not a bad fit at all in the tubing. Seems the 3/4 brass is smaller than the 3/4 copper fittings. I bought a 3/4 brass pex elbow as well, but I'll try not to use it if I don't have to. Martin, when you were saying it is no more restrictive than 4" of tubing, what did you mean by that? If I can make a curve with less than 4" of tube will it be better than using that elbow?

Also, did you use zip ties for hose clamps on those T's in that picture?

Great. Yes, a while back I figured an equivalent in restriction of tubing length to a copper bend. A copper 90 was about equal to 4" of 7/16" ID tubing, very little restriction. The brass ones would be a little more, I've got one sitting here...just need to test it, but yes...you'll always be better off bending the tubing with smartcoils than using a fitting But these are all very very very small restrictions, you'd never see a temperature difference even with a few elbows especially with the brass 3/4 types.

And yes, just a nicely pulled black zip-tie for me, I use two on regular barbs. If you use plyers to stretch them tight, they serve plenty of holding strength especially with 7/16" ID tubing.
    
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post #19 of 24
Thread Starter 
Ok, thanks. Maybe one brass elbow will do the trick. I also bought some small copper pipe hangers to hopefully use instead of zip ties for routing my hose. Thought it might look cool if I can place them well.

I am patiently waiting for the UPS man to show up at my door today with 2 more Yate Loons, a D-Tek Fuzion block w/ Pro mount, 10 feet of MasterKleer, another tube of Arctic Silver 5 cuz I'm almost out, thermal tape, and something else which escapes me right now.
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post #20 of 24
Thread Starter 
2 pictures of my new loop. No elbows used. What do you think? Looks like might be a kink in the second one, but in the first you can tell it isn't one. No elbows used either. Don't worry, I put hose clamps on after these pictures were taken.



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