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Tubing size recommendation?

post #1 of 7
Thread Starter 
For a new water-cooling build I'm considering 7/16" ID x 5/8" OD tubing. While I can get the tubing, compression fittings and stoppers are difficult to get. It seems 1/2" ID x 3/4" OD and 3/8" ID x 5/8" OD are more readily available. While 3/8" ID x 5/8" OD is narrower tubing and easier to work with (also lower-profile), I'm concerned the flow will be reduced. I'll be using this tubing with an EK Supremacy, MCP35X pump and probably Alphacool ST30 radiator. FYI, this'll be a CPU only loop.

Thanks.
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post #2 of 7
There is very little to no performance differences between 3/8", 7/16" and 1/2" ID tubing. Cathar did a write up on XS about this a while ago.

The two sizes you mentioned (3/8x5/8" and 1/2x3/4") are better than the thinner wall variants as they are less prone to kinking, allowing tighter turns with the need for anti kink coils or other measures.
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post #3 of 7
Thread Starter 
There seems to be more variety in fittings when looking at 3/8" ID x 5/8" tubing. Thanks for the link. That write-up that Cathar did, do you think an overclocked 3930K would make much difference to the results?
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post #4 of 7
Not really, there will still be minimal difference.

Basically tubing is very low in restriction compared to your blocks and rads. As such any size reduction is very much a second order effect compared to other factors.
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post #5 of 7
yea kinky loops have no place on the watercooling board
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post #6 of 7
Thread Starter 
Great, thanks.

If I used barbs on my T-line's T-block (the part of the T-block going downwards - in the picture I show compression fittings), what's the best way to keep them secure? Some sort of zip-tie or a metal clamp? I think compression fittings will make the T-line too heavy and pull the loop downwards, so I'm thinking of barbs instead.



EDIT: Never mind, I found this neat looking part:


Edited by aln688 - 8/29/12 at 4:24pm
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post #7 of 7
For clamps you have a few choices.

Personally I prefer the Spring steel type. I find them easy to use and very secure. They are also easy to remove and allow you to re-use the tubing (so you can pop a tube off, do whatever and then replace it). Best of all they keep a constant pressure on the tubing even as it compresses slightly over time.

Worm drives are a cheaper alternative. Personally I don't like the looks of them. One thing to be careful of is that sometimes the band can have sharp edges. It is easy to overtighten and damage the tubing.

Some people like plastic clips. You can get them in different colours and / or UV reactive. Resuable, mostly easy to remove.

There are also the hex type - a bit more bling, a lot more cost. Resuable and colours are available. They don't span a huge size range so you have to make sure you get the right ones.

Finally there are zip ties. Cheap and effective, can get different colours, not reusable and difficult to remove without danaging the end of the tubing. Just make sure you get them good and tight (I used pliers) and I would reccomend that you use two per fitting.

Choose what you want based on looks, price and availability.
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