Compression fittings...

Soldato
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I'm going to give compression fittings a go for the loop I'm making atm, but I'm getting a bit confused...

I want to use 1/2" tubing, and I'm limited to using compression fittings with a maximum outer diameter of 25mm. The bitspower ones seem to be too big at around 26-27mm diameter for the compression fittings outer casing.

My googling skills are weak today - anyone know which of the 1/2"ID compression fittings are 25mm wide or less?
 
Soldato
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½" ID compression fittings are not a great plan IMO. If you want ½" ID just use barbs but as someone who's tried all the main sizes I would never now use anything but 7/16 over barbs.
 
Soldato
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I've got koolance 1/2 compression barbs on my QC's with are good as the inner bit is just like a barb (hence the name) :D
They didn't make straight barbed version at the time. they are 13mm(5/8) 19mm(3/4)
best of both worlds and they don't rotate the tube when attaching the locking ****.

qc4.jpg

Components parts (female connector on left)

are you sure you've got those bitspower dim correct?
The ones I could find match 'normal' tube sizes
ID11mm(7/16) OD16mm(5/8)
ID12mm(1/2) OD19mm(3/4)

they also do smaller ones 3/8 and 1/4 but not listed them above

Do prefer barbs, but can see the attraction of compression fittings
 
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Soldato
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was thinking of getting the ghost primochill fittings in black, got me thinking i might have to buy one with some tubing to test first now...
 
Soldato
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a very small number of people have reported issues with the plastic ghost fitting - mostly due to o ring incopatability (aka leaks) for memory it was to do with rebated threads on blocks, can't remember now sorry :( was in one of the many typhoon3 threads
 
Associate
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I can confirm the bitspower 1/2" to 3/4" are fine and if it helps the sku on most websites is BP-BSCPF-CC5.

HTH
 
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Sorry just looked at your post properly and your after the overall width, can i ask why the width concerns you?
And yes there 26-27mm wide
 
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Soldato
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The reason it can't have an outer diameter (of the compression fitting casing) more than 25mm is it needs to fit like so:
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The copper top bit there , and the copper 'port'/cylinder is 25mm diameter. There'll be aluminium equal angle in front at the corner, so has to be less than 25mm. It looks like the koolance ones are the least bulky, so I'll try some of those with some 1/2" tubing and see how the flowrate compares to 7/16". If flowrate is good with all the blocks in the loop I may just stick with 7/16".
 
Soldato
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I don't have callipers here, but my best effort with a steel rule is 18mm diameter for 11/8mm compressions. I'm aware that you're looking at greater diameters than this, but it's always good to have more data.

1/2" tubing tends to be 3/4" thick, so the tubing itself is 19mm. At 3mm allowed clearance either side of the tubing I don't see there being enough width for any compression fittings.

Unsure on the sizes of the primochill ghost, but a friend of mine bought some and broke several. They're strong if thrown at the floor, but if you slightly overtorque them they shatter. Compression fittings which cannot be tightened beyond finger tight don't seem sensible to me.

Xtreme didn't find significant flow rate differences between 8mm and 1/2", but I daresay you know this. Low pump pressure/mad peripheral resistance? Reminds me to check your build log, cheers
 
Soldato
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Doh! - sorry Monkey Puzzle will measure the Koolance ones when I get home.
Outside Diameter and outer diameter are to simular :(
I can't see the image btw, but I can understand the issue - why not just use barbs?
Or even the metal primochill ghost fitting - like using 7/16 over 1/2 barbs - but with 1/2 tube
 
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Soldato
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For those who asked why I won't do compression fittings again, it's just that I can't see the benefit. I have a Swiftech kit in one of my rigs and I used its compression fittings and they just didn't feel as solid and safe as a nice tightly fitting barb.

Hey, it's just an opinion.
 
Man of Honour
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I'll second what Mike has said. I just don't trust compression fittings. Barbs and 7/16 for me.
 
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