Pump too powerful? Tubes are popping out of their fittings.

[TK1T]

Ignore the bad tubes, please. 

The situation is that the loop is full and running for two hours. The pump is obviously running at full strength since its leak testing time. The tube gets pushed out of both the compression ring screw-on thing and the o-ring inside of the fitting. My bathroom is now filled with purple liquid. 

My guess is that the liquid is running so fast to where its actually pushing on the top of the GPU block and subsequently Newton's third law. 

There are two red boxes in the image that signifies where the tube is popping out when the loop runs for some time. I ended up gluing the o-ring on the right to the tube and it doesn't pop out again. I have not done the same mod for the one on the left because I find it concerning that I have to use very strong glue to make it so that tubes are not popping out. 

I am pushing the tube all the way into the fitting. The tube top is sanded and deburred (it's completely flat). I am screwing it on as tight as I possibly can- so tight to the point where it's actually equally as hard to get it off. Do I just have to glue the o-ring or am I doing something wrong? 

 

[iMaximusrex]

The way compression fittings work that shouldn't be an issue if the sizes of all the fittings and tubing are matched correctly and to spec, and the tubbing is fully inserted into the fitting.  Maybe the O-rings or fittings are slightly off spec?  If you can try to use different fittings and see if the problem persists.  I really do not suggest using glue.

[LeDoyen]

the tubes should also be chamfered, or you risk pushing the orings down into the fitting, or even cutting them.

the fittings resist stupid pressures that the pump is totally incapable of producing, so you must have mounted the tubes wrong in one way or the other 🙂

Could be tube prepping : cut, debur, chamfer the outside edge, and i usually buff the end on my pants, rubbing the tube fast to get the tube end sleek, without sanding "hair" and impurities that can make the orings dirty.

Could be that you forgot to insert the clamping oring. There is one seal oring already in the fitting, but you also need to put the clamping oring that sits between the fitting top and the part you screw in. It compresses this second o-ring to press all around the tube and hold it in place.

If you forgot that oring, the fitting will have NO retention at all and  the tubes will pop

[TK1T]

11 hours ago, LeDoyen said:

the tubes should also be chamfered, or you risk pushing the orings down into the fitting, or even cutting them.

the fittings resist stupid pressures that the pump is totally incapable of producing, so you must have mounted the tubes wrong in one way or the other 🙂

Could be tube prepping : cut, debur, chamfer the outside edge, and i usually buff the end on my pants, rubbing the tube fast to get the tube end sleek, without sanding "hair" and impurities that can make the orings dirty.

Could be that you forgot to insert the clamping oring. There is one seal oring already in the fitting, but you also need to put the clamping oring that sits between the fitting top and the part you screw in. It compresses this second o-ring to press all around the tube and hold it in place.

If you forgot that oring, the fitting will have NO retention at all and  the tubes will pop

[LeDoyen]

it looks chamfered on the inside, but not the outside. maybe an effect of the photo, or my 1 AM eyes ^^'

Don't be afraid to go all out on your chamfer. you really don't want the tube to bump on the internal oring or to rip it.

the internal oring is in good condition ?

[TK1T]

1 hour ago, LeDoyen said:

it looks chamfered on the inside, but not the outside. maybe an effect of the photo, or my 1 AM eyes ^^'

Don't be afraid to go all out on your chamfer. you really don't want the tube to bump on the internal oring or to rip it.

the internal oring is in good condition ?

Yea the internal ring is completely fine. I've already been through three different fittings and I've been trying my best to push it in all the way. I did like thirty+ twists with the deburring tool for the outside so its probably just the glass camera trick. 

[LeDoyen]

that's totally weird then.

I had the opposite problem, with tubing impossible to insert in the correct fittings, and i had to measure the tubing diameter to see they were off spec and get em replaced.

Could be worth checking that.. the tube OD, see if you have 14mm tube. It's Corsair tubing?

 

Another idea i just had after posting, sometimes with a dry compression oring it's hard to tighten the knurled cap, and you may think it's tight when it's not.

Wetting it may allow you to screw it fully. That could help, but if you had leak after leak, i imagine that oring must have become wet at some point.

Edited February 3, 2022 by LeDoyen

[TK1T]

An update: I did not push the tube all the way in. 

I just thought I did but this time around I really push it in-- to the point where my palm had a little circular imprint. Ran it for 16 hours straight and no explosion. Appreciate the help!