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Hose Diameter

post #1 of 7
Thread Starter 
How do you know what size hose diameter you need?
post #2 of 7
It all depends on the barb size you're using...

I use G1/4-1/2" barbs (which is standard) and 7/16"ID x 5/8"OD tubing for a tighter fit and have used this setup for the past 6 years with no issues...

Using XSPC Flex tubing at the moment and love it.

http://www.sidewindercomputers.com/xsflxcltu7id.html
Edited by By-Tor - 10/28/13 at 7:45pm
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post #3 of 7
Thread Starter 
So there is no correlation between heat demand and tube side?
post #4 of 7
As said it depends on the fittings you will be using. If you are using barbed fittings you only need to think about the inner diameter, for compression fittings you have to get tubing with the right outer diameter as well. the spesifications should be in the product info on whatever page you will be ordering from(and on the packaging if you are purchasing over desk). And no, tubing thickness doesnt matter in most cases, exeptions would be extreme setups with extreme heat output or vastly overpowered pumps, in other words not in consumer grade pcs
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post #5 of 7
Thread Starter 
Ok let's see if I have this right. All of my water blocks are threaded with G1/4 female. Does this mean I shouldn't waste my money on hose sizes larger than 1/4 inch?

It's does make sense as the 1/4 water block would be the choke point.
post #6 of 7
Quote:
Originally Posted by Sir Diesel View Post

Ok let's see if I have this right. All of my water blocks are threaded with G1/4 female. Does this mean I shouldn't waste my money on hose sizes larger than 1/4 inch?

It's does make sense as the 1/4 water block would be the choke point.

Yes and no. Whilst you are right that the ID of the G1/4 thread is the choke point long runs of smaller diameter tubing also creates restriction. You would get higher flow rates with larger tube sizes regardless of the fact that the flow still has to go through the same size thread ID. The only time where this isn't true is if you maxed out the flow through the choke point, which happens as you get to the speed of sound in the medium at that point - not going to happen here.


However, having said that the restriction of the tubing is negligible compared to the restriction of the blocks in the loop, so different size tubing isn't going to make a difference.

Cathar (I think?) did an experiment a while ago where he showed that there was effectively no difference in temperatures between 3/8" to 1/2" ID tubing.

Other than looks and minor cost differences thicker walled tubing is more resistant to kinking, smaller diameter tubing can turn tighter bends.


Tl:Dr - Tubing size makes no difference to performance, pick based on personal preference.

Edit: Cathar's performance impact calculations on XS
Edited by GingerJohn - 10/30/13 at 10:35am
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post #7 of 7
Thread Starter 
@GingerJohn, thank you for that well thought out answer. thumb.gif
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