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

post #1 of 29
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**before you say something, I actually searched found answers, BUT, most of the answers i foundconflict with the other answers i've read... I dont know which one's right and wrong anymore, so I decided to just ask.

Hi guys, been watercooling for 3 months now, been reading everyday about it the theorys, the CFm and such, the rad sizes, flow rates etc.. but something really really REALLY bugs the hell out of me..

Tubing/fitting sizes....

To start off, I started watercooling from a rasa kit, an average 5/8" 7/16" tubing same for the fittings. Now here's the thing, my local PC shop sells well.. computer parts and the random bits and bobs of watercooling components. But they only have 3/8" or 1/2", exactly how many types of sizes are out there? and which ones are the best to use? I would very much like to switch to a 3/8 tubing because this shop im talking about is like 30% cheaper than most online shops we have here in UK...

does this mean i ahve to replace every fittings that I have? tubings? I know this sounds confusing.. Anyway, all I want to ask is which fitting/compressions is comapatible with which tubing? most online shops here doesnt really tell me which tubings are compatible for a certain fitting i'm looking at...

ther'es just too many sizes and it's really confusing me...

Thanks a lot... ^_^


I'm still reading guides and all that, but nothing about sizes... I'm bad at numbers...
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post #2 of 29
It depends. If you're using barbs then you match the fitting to the inner diameter of the tubing. If you go with compression fittings then you have to match both the inner and outer diameter. So if you're going to use 1/2" barbs then the only dimension you have to worry about is the ID of the tubing which would be 1/2" ID tubing.
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post #3 of 29
It's a mistery to me too. Not sure why everyone wants 1/2" or larger tubing when every fitting and block I have seen reduces down to 1/4". I must be missing something.
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post #4 of 29
Thread Starter 
Quote:
Originally Posted by HootyHoo View Post
It's a mistery to me too. Not sure why everyone wants 1/2" or larger tubing when every fitting and block I have seen reduces down to 1/4". I must be missing something.
Aha! exactly what I was just thinking!
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post #5 of 29
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Quote:
Originally Posted by Blue6228 View Post
It depends. If you're using barbs then you match the fitting to the inner diameter of the tubing. If you go with compression fittings then you have to match both the inner and outer diameter. So if you're going to use 1/2" barbs then the only dimension you have to worry about is the ID of the tubing which would be 1/2" ID tubing.
so basically, if i choose barbs *which I prefer sometimes* I only ahve to worry about the ID, and I can ignore the OD? dont matter what the OD is, as long as the ID on the tube and the barb is the same?
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post #6 of 29
as longg as the ID is correct for the barbs. you should be fine. what store is this? if you're in central then you could go to yoyo tech as theyre pretty good
     
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post #7 of 29
Thread Starter 
Quote:
Originally Posted by Sircles View Post
as longg as the ID is correct for the barbs. you should be fine. what store is this? if you're in central then you could go to yoyo tech as theyre pretty good
that's the shop im talking about ^_^
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post #8 of 29
Quote:
Originally Posted by HootyHoo View Post
It's a mistery to me too. Not sure why everyone wants 1/2" or larger tubing when every fitting and block I have seen reduces down to 1/4". I must be missing something.
1/4" is the thread size of the fittings. 95% of modern fittings are 1/4".

Quote:
does this mean i ahve to replace every fittings that I have? tubings?
If you want to use different compression fittings on the Rasa kit, you'll have to buy new tubing yes. Tubing isn't that expensive though.

Are you aware that the Rasa comes with 1/2" barbs? You can heat the end of the 7/16" tubing that comes with it, fit it over the barbs and when it cools it'll form a super-tight seal. This completely eliminates the need for clamps or compression fittings, however you should probably buy some clamps just incase. Use nearly-boiling water.

Quote:
Anyway, all I want to ask is which fitting/compressions is comapatible with which tubing? most online shops here doesnt really tell me which tubings are compatible for a certain fitting i'm looking at...
The size of the fitting corresponds to the size of tubing you need. A 1/2" ID 3/4" OD compression fitting is made to fit 1/2" ID 3/4" OD tubing. You may be getting confused with the thread size. This is the size of the screw thread which screws into the water cooling components. All of the components in the Rasa kit are 1/4" thread. You will be able to buy any size fittings that have a 1/4" screw thread, then buy the tubing to match the fitting size.

Have you tried Specialtech.co.uk? I bought all of my water cooling gear from them whilst in the UK and I always found them to be the cheapest. Their customer service is top notch too.
Edited by jNSK - 5/1/11 at 3:13pm
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post #9 of 29
Thread Starter 
Quote:
Originally Posted by jNSK View Post
1/4" is the thread size of the fittings. 95% of modern fittings are 1/4".



If you want to use different compression fittings on the Rasa kit, you'll have to buy new tubing yes. Tubing isn't that expensive though.

Are you aware that the Rasa comes with 1/2" barbs? You can heat the end of the 7/16" tubing that comes with it, fit it over the barbs and when it cools it'll form a super-tight seal. This completely eliminates the need for clamps or compression fittings, however you should probably buy some clamps just incase. Use nearly-boiling water.



The size of the fitting corresponds to the size of tubing you need. A 1/2" ID 3/4" OD compression fitting is made to fit 1/2" ID 3/4" OD tubing. You may be getting confused with the thread size. This is the size of the screw thread which screws into the water cooling components. All of the components in the Rasa kit are 1/4" thread. You will be able to buy any size fittings that have a 1/4" screw thread, then buy the tubing to match the fitting size.

Have you tried Specialtech.co.uk? I bought all of my water cooling gear from them whilst in the UK and I always found them to be the cheapest. Their customer service is top notch too.
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?
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post #10 of 29
Quote:
Originally Posted by HootyHoo View Post
Not sure why everyone wants 1/2" or larger tubing
Flowrates, however pressure needs to be accounted for, too, and 3/8"ID has the best balance of flow and pressure. http://www.xtremesystems.org/forums/...d.php?t=147767

Edit; also some guys like the look of larger tubing better, but you know what they say about opinions...
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