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Really really amateur question about tubing sizes, ID/OD and such - Page 2

post #11 of 29
My English shudn't be more gooder then urs.

I find it odd that you jumped into Water Cooling without doing a lot of reading first.

Your Rasa Kit did not come with 7/16" OR 5/8" fittings, the barbs are all 1/2". The tubing's ID is smaller (7/16" ID) because the plastic stretches on the barb for a tighter seal.

Most cooling systems use standard 3/8" or 1/2" because anything smaller would require greater pressure from the pump to transfer heat. Water can only transfer so much heat per liter/gallon efficiently, so carrying larger volumes at slower speeds is more attainable for traditional pumps. Like blowing through a straw versus a garden hose (insert Full Metal Jacket joke here).

When using barbs, you only need to worry about the OD when applying clamps. Most clamps can adjust to a certain point, but they still need to be able to fit over the barb with the tubing.

EDIT: I got Ninja'd so hard!

x2 on thread size confusing you.
Edited by Nytehawk - 5/1/11 at 3:22pm
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post #12 of 29
Quote:
Originally Posted by MorbEIn View Post
yeh, that's where I bought my rasa kit, hey check out chilledpc.co.uk, their tubes are like less than a pound per foot! compared to £2 on specialtech! XSPC tubings though, but still good ^_^


anyway, this is what i mean hehe, you gave me an asnwer which is a bit different from the previous answer i got above, so even if it's barbs, I still have to worry about the OD? if it's 1/2 ID 5/8 OD tubing, can I not use it on 1/2 id 3/8 OD barbs? or vice versa?
Bit late now, I don't live in England.

Where barbs are concerned, it's just the ID that matters. Google a picture of a barb and you'll see why. The inner dimension of the tube actually fits around the barb, the outer dimension doesn't make a difference.

Where compression fittings are concerned, you need to match the ID and OD since the tubing gets screwed on top of to the fitting itself.
Edited by jNSK - 5/1/11 at 3:23pm
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post #13 of 29
Tubing size makes no differece to performance above 3/8" (I don't know below, but I prob wouldn't trust lower)

The wall thickness on tubing is kind of important; essentially, thicker walls are less likely to kink and deform, though with proper installation of thinner walled tubing, that isn't an issue.

The reason people go for 1/2" ID tubing is because it looks awesome

Or because they think it will give them better temps, which it wont, so forget about those people...



About the barbs, you can use 3/8" tubing on 1/2" barbs... You just have to stretch the tubing to manage it, hot water to soften the tubing is a common technique. The main reason people do this is because it forms a very tight seal once cooled and you don't really need anything to hold it on the barb. (though do it at your own peril)
Edited by Crabid - 5/1/11 at 3:26pm
    
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post #14 of 29
When you got everything up and ready don't close the side of your PC case to make sure there are no leaks when you power on your system.
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post #15 of 29
ive fitted clear water hose from my local hardware store £2 per meter plus a t piece 75p and tap £1.75 got 20 plastic clamps for £1 i cant under stand people paying over the top prices at pc shops i go to my locale hardware store or plumbers merchant 1/4 inch bsp is a standard gauge uesd in pluming
    
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post #16 of 29
Thread Starter 
aha cool cool! I think I understand tubing, fitting sizes a bit more.. now to apply all this knowledge IRL....
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post #17 of 29
Quote:
Originally Posted by Crabid View Post
About the barbs, you can use 3/8" tubing on 1/2" barbs... You just have to stretch the tubing to manage it, hot water to soften the tubing is a common technique. The main reason people do this is because it forms a very tight seal once cooled and you don't really need anything to hold it on the barb. (though do it at your own peril)
Really? I tried to use 1/2" barb with 3/8" tubing to fill my system a few months ago because I had an extra 1/2" and it didn't work well. Even after putting the tube in nearly boiling water I was only able to get it partially on the barb. Maybe some tubing stretches much more than others.
 
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post #18 of 29
Quote:
Originally Posted by Captain1337 View Post
When you got everything up and ready don't close the side of your PC case to make sure there are no leaks when you power on your system.
I hope that's not your protip for leak testing!

You want to cut all your tubing to the components matched up inside your case, then take it out of the case, fit it all together, fill the loop, hook it up to your PSU, and run it. At LEAST you want to disconnect all the components of your pc from your PSU, if you're going to leak test inside your case.

If that isn't what you meant, disregard this.

Quote:
Really? I tried to use 1/2" barb with 3/8" tubing to fill my system a few months ago because I had an extra 1/2" and it didn't work well. Even after putting the tube in nearly boiling water I was only able to get it partially on the barb. Maybe some tubing stretches much more than others.
No kidding, i thought 7/16" to 1/2" was tight!
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post #19 of 29
Quote:
Originally Posted by mdatmo View Post
Really? I tried to use 1/2" barb with 3/8" tubing to fill my system a few months ago because I had an extra 1/2" and it didn't work well. Even after putting the tube in nearly boiling water I was only able to get it partially on the barb. Maybe some tubing stretches much more than others.
I believe I was using 3/8"ID 1/2" OD, it'd prob be a lot harder to manage with 5/8" OD, and truth be told, it was anything but easy to manage lol.

Now I just use compressions, lovely looking and easy.
    
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post #20 of 29
Thread Starter 
Some people may hate me saying this, I started watercooling 3 months ago, and now i'm obssesed with it. Cant stop upgrading... first time I got my rasa kit. I only leak tested for 5 mins... Kinda said to myself, that I know I did a good job, checked everything is sealed tight, screwed the fittings perfectly. I know I'll get myself in trouble in the future by not leak testing, but sometiems I wish i leak, taht way, i ahve a reason to buy better components

Edit: damn typos... typing on a tablet right now...
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