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Fitting barbs and compressions

post #1 of 11
Thread Starter 
A noob water cooling question, sorry if this sounds like basic stuff but I don't want to mess anything up.

I'm about to start fitting all my Bitspower fittings to my coolers, res and rads etc.


Should I just screw them in finger tight or get a pair of grips on them to get them really tight into the 1/4" threaded connections? The same with the compression rings, should I tighten these the final few threads with a pair of grips?

Thanks
Sniffs
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post #2 of 11
I usually use only my hands. If you have weak hands a slight turn with a pair of grips won't hurt. Just don't over tighten them. Also make sure you put something on the grips like a thick piece of cloth so they don't ruin the pretty look of the barbs
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post #3 of 11
By hand, using tools scares the bejesus out of me with so many things close by
post #4 of 11
From experience I can say to put a strip of electrical tape over the knurling of a pair of pliers, and after hand tightening about as much as you can, use pliers and do another 1/4 turn.

Depending on the tap of the threads, the o-ring on the barbs may seem tight from a hand tighten, but may not be sealing 100%.
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post #5 of 11
Thread Starter 
Cool, thanks all for your feedback, using iPhone at the moment so don't know how to add rep, but will do once I get to a PC.
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post #6 of 11
Don't over tighten!

They don't seal due to the threads. The threads just put tension on it, squeezing the "O" ring. It should apply only enough pressure to flatten the surfaces slightly, but not so much as to smash all the elasticity out of it.

I see resellers saying to moisten them before tightening, and not put in dry. Based on threads here, I plan to use plumbing grease on all of mine. Look all around (with a magnifier) to make sure they are sealed properly. this link says that there are 19 threads per inch so one complete twist advances it 1.33mm. The O ring has a minor radius of 1mm, as I measure it. From "full contact", another quarter twist will compress the ring by 1/3mm or one sixth of its original thickness.

However, the threads are hard enough to turn that I can't feel where that full contact position is. It's hard to see, too! So fancy colored O-rings might be a good idea after all.

Each fitting might have a different feel to it, since each part is made by a different supplier out of different materials.

So, don't go "by feel", although you should be able to do it by hand (though it may be sore after 20 or so!). Rather, go "by eye" as to taking up the gap and flattening the ring slightly. Inspecting each one with a hand magnifier is less messy than a leak test, and should find any problems early.

—John
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post #7 of 11
Use a basin wrench.
699
The right tool should make it easier/safer to use than using your fist in a tight place.

Though I plan on installing them all before installing the parts they are mounted in.
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post #8 of 11
Thread Starter 
I fitted most of my tubing and fittings today and my fingers and thumbs are red raw, didn't use a basin wrench but did use my grips on some fittings with some insulating tape over the jaws. If I ever do this again I'll use barb fittings instead of compression fittings.
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post #9 of 11
Fingers is what I use.
YOU stole my CPU block... wth.gif
tongue.gif
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post #10 of 11
Thread Starter 
Quote:
Originally Posted by Triangle View Post

Fingers is what I use.
YOU stole my CPU block... wth.gif
tongue.gif

It's a nice block, thanks thumb.gif
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