quick - need name of barbs for 1/2" tubing that don't need hose clips

1/2 DD fatboys are ok (but I'd use a cable tie)
as are the bitspower highflow (fatboys with a few tweeks)
and DD perfect seal (but this are a pig to use)
 
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I'd guess its the danger den fatboys you're referring to. If you absolutely can't have external clamps, compression fittings are certainly a safer route to take if they'll fit.

Any barb you manage to ram the tubing onto will let it off if something pulls hard enough. I don't know what sort of tensile load compression fittings will take, but I'm pretty sure I could suspend my case using them.
 
JonJ678 said:
I'd guess its the danger den fatboys you're referring to. If you absolutely can't have external clamps, compression fittings are certainly a safer route to take if they'll fit.

Any barb you manage to ram the tubing onto will let it off if something pulls hard enough. I don't know what sort of tensile load compression fittings will take, but I'm pretty sure I could suspend my case using them.
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Bold claim!, I expect to this this tested :p
 
Happy said:
Bold claim!, I expect to this this tested :p
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Done. Ran a length of 10/8mm dirt cheap tubing under the case with a compression fitting on the end, held the tubing at one and and the compression at the other, and with considerable effort picked it up. Not ideal I know, as there was only a fitting at one end, but as proof of concept its not bad. Trying to find a barb to provide an estimate of what load it can take. Found a compression T piece that doesn't fit through a 1" hole widthwise, hanging iron weights from it.

My chosen 10/8mm compression fitting fails by tube slipping with no visible damage to thread, nut or tubing at 35kg lift from ground after successive 5kg loading. I've now hung it from a cross bar with 10kg to see if it creeps appreciably. Don't know what my case weighs though.

nzko4x.jpg


That would be the arrangement, with this a close up of the unfortunate T piece. Webcam quality photos I'm afraid, and poorly lit as I don't understand photography.

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It doesn't creep noticably under this time frame at 10kg. Hung 20, and after a while found it resting on the floor. So apparently the tubing lengthens with time. Held it and shook it up and down with 20kg hanging off it, came off after 10 seconds or so of this and narrowly missed my foot.
 
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JonJ678 said:
I'd guess its the danger den fatboys you're referring to. If you absolutely can't have external clamps, compression fittings are certainly a safer route to take if they'll fit.

Any barb you manage to ram the tubing onto will let it off if something pulls hard enough. I don't know what sort of tensile load compression fittings will take, but I'm pretty sure I could suspend my case using them.
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LOL, load of poop! You tried 7/16 tubing on 1/2 Fat Boys? Only way you're getting it off is if you cut it off.

Had mine on for 6 months now WITHOUT clamps and they are absolutely fine.

RoEy
 
RoEy said:
You tried 7/16 tubing on 1/2 Fat Boys? Only way you're getting it off is if you cut it off.
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If you happen to have one and a meter or so of tubing spare I'd be pleased to tell you what force it fails at, I'll even post them back afterwards :)
 
I have had a brand new batch of 7/16 tubing just 'come off' 1/2 barbs beforewhere as most of the time it's needs to be cut/heated up to come off :( Anyway I now use jubilee clips on all the joins.
 
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JonJ678 said:
If you happen to have one and a meter or so of tubing spare I'd be pleased to tell you what force it fails at, I'll even post them back afterwards :)
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Don't need you to tell me mate. I've tried it myself and it's certainly got enough grip. Anything above that then you deserve it if it comes off. :D

Before I ventured into water cooling, I was initially worried about the prospect of having tubing on barbs without clamps. PaulyD told me many times that it's fine and that I'd know how hard it grips when I get it on.

I had to heat the tubing up in order to get it on the Fat Boys and yes the grip was immense. It may be different for other barbs and tubing but I'm referring to 7/16" tube & Fat Boy 1/2" Barbs. In my opinion, that is a great combo to have if you don't want ugly clamps.

In everyday use, there really is no chance of the tubing coming off "IF" you have put it on correctly.

RoEy
 
I meant some attempt at quantifying it beyond "grips hard". My compressions fail around 350N, which is significantly under what I expected. I'd be interested to know how shrink fitted tubing compares. Any chance of you rigging up something similar to the above?

I'm wary of heat fitted tubing. Put simply, you're pumping hot water down it. If the pump fails or refuses to start, the cpu block can get astonishingly hot. The tygon I've got fixed to it is much more flexible at these temperatures. If it gets up to perhaps 70 degrees, and you force fitted the tubing on, suddenly the connection isn't as reliable as it used to be.
 
JonJ678 said:
I meant some attempt at quantifying it beyond "grips hard". My compressions fail around 350N, which is significantly under what I expected. I'd be interested to know how shrink fitted tubing compares. Any chance of you rigging up something similar to the above?

I'm wary of heat fitted tubing. Put simply, you're pumping hot water down it. If the pump fails or refuses to start, the cpu block can get astonishingly hot. The tygon I've got fixed to it is much more flexible at these temperatures. If it gets up to perhaps 70 degrees, and you force fitted the tubing on, suddenly the connection isn't as reliable as it used to be.
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You're talking about tension that just won't be applied to it in normal use. It's like saying a seat belt won't save your life if you crash at........500mph.

Like I said, normal every day use of a water cooled PC, if you've built it correctly and used the right parts will be fine. I don't sit at my desk yanking at my tubes saying "they're fine, they're fine".

If my pump fails then my PC will shut down if the CPU reaches 80 – simple and don’t forget the water won’t be nowhere as hot as what the CPU is. There's always an element of risk with whatever you do in life. It's called living.

Just looks like your going way OTT with all of this. Yes it's interesting to know at what point they fail but that brings us back to the seatbelt scenario.

RoEy
 
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It's important to be able to estimate the risk involved. That's called engineering. I know that the barbs and tubing attached to a cpu block when a pump has failed to start are definitely hot to the touch. As such I would little faith in the integrity of a push fit on the cpu block when the pump is not running. That you are indifferent and I am not is reflected in my bothering to research this and you telling me not to bother. Each to their own, it's my few minutes not yours.

Tubing becomes far more flexible when hot. Elongation comfortably triple what it was when cold. Load fails at 35 kg with warm water, fails at 30 with hot (sub boiling) water. Experimental difficulty in keeping the damned thing hot for long enough to load, so the 5kg decrease in capacity is probably at around 60 degrees. Noticeably hot when it splashed out, but not enough to scold.

This concludes the testing I can do, as I have no barbs. Compression fittings showing decreased load when hot supports the notion that push fitted tubing will suffer similar. I believe the decreased load carrying of push fitted barbs is worth investigating if one is not going to use clamps in addition to wall tension. I'm not going to investigate this as 1/I don't use barbs and 2/I don't have any barbs.

p.s. as a potential use, cutting threads in the top of a case and suspending it from a desk as a means of reducing vibrations. Possibly as a convenient fill port as well.
 
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I think JonJ is doing it just for the science - there is nothing wrong in knowing 'X' compression fail at 350N - infact I'm with JonJ and find that quite low.

I know from experance that removing 7/16 and 1/2 tube from different barbs is variable.
I have some 1/2 Koolance compression barbs (not compression fitting) and 7/16 tube will not come off - the barb tails are so sharp they cut me! and slice into the tube if you pull on it.
With the correct 1/2 tube the locking nut forces the barb to 'bite' into the thick wall of the tube - I think the tube would fail first with koolance fittings.

The feser, bitspower and primochill compression fitting only have the tension nut to fix the tube in place so I guess 350N is enough to streach the tube wall thinner then the fitting fails.

The bigboys are excelent barbs - if you use 7/16 they will not fail (I've lifted my case with one attached to my cpu block. The dtek are almost as good.
Ek barbs - even 7/16 will pull off with a little effort (but that's what they are designed for)

Edit: but MP asked about 1/2 tube with barbs - if you don't want even a cable tie - use koolance compression barbs (only one's I'd use)
but It'd recomend the use of 7/16 monkey puzzle, if you want barbs, but not extras.

the metal ghost primochill barbs may work - never tried them myself.

@ JonJ - I'll send you a few different barbs (and tubes) - always happy to but real numbers to these debates.
@ RoEy - yes it is a seatbelt scenario
 
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