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Compression fitting question

post #1 of 10
Thread Starter 
My loop is using all compression fittings with 1/2 3/4 tubing. I tighten it till its hand-tight, but from my understanding, there should be only a 1-2mm gap between the two parts of the fitting. The gap on mine looks much larger than it should be, yet I can't really tighten further. Is this fine?
post #2 of 10
Yes. As long as you've pushed the tubing all the way over the barb and tightened the compression seal all the way down you should be good to go.

If it's significantly off you might have a problem, but you should be good with a gap all the way up to around 5mm.
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post #3 of 10
If the barb is as tight as you can get it and will not budge and you think its too wide, try a bit of lubricant (washing up liquid) and see if that helps,

if not just see what happens once you leak test
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post #4 of 10
Thread Starter 
The tube is all the way over the fitting, it's just the part you twist on that doesn't go down completely. I got it hand tight but as I said, it seemed like there was too much of a gap.

Thanks guys
Edited by Sirius - 1/17/11 at 11:45am
post #5 of 10
okay , If also your unsure just give it a quick tug , If it comes off then youve got problems if not you'll be fine

Please rep =)
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post #6 of 10
Quote:
Originally Posted by Sirius View Post
My loop is using all compression fittings with 1/2 3/4 tubing. I tighten it till its hand-tight, but from my understanding, there should be only a 1-2mm gap between the two parts of the fitting. The gap on mine looks much larger than it should be, yet I can't really tighten further. Is this fine?
The collar will not go down as far if the tube is being bent directly from the fitting. The gap will be more like 4-5m. If you are not bending the tube directly from the fitting, then the gap is too much.

When you tightened the collar, did you use a towel or something to get a firm grip?
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post #7 of 10
Thread Starter 
Quote:
Originally Posted by mhaneline View Post
The collar will not go down as far if the tube is being bent directly from the fitting. The gap will be more like 4-5m. If you are not bending the tube directly from the fitting, then the gap is too much.

When you tightened the collar, did you use a towel or something to get a firm grip?
No, I used only my hand (messed them up pretty good ><). I'll have to try with a towel but yeah, most of the tubing is bent.
post #8 of 10
i used two pliers and a rag... all my compressions are flush... but yeah... if no leaks then you should be ok

lol... those compressions can cause some skin damage... you wouldn't think... i have lost some skin, got minor cuts, and blisters when i first set up my loop
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post #9 of 10
Quote:
Originally Posted by Sirius View Post
No, I used only my hand (messed them up pretty good ><). I'll have to try with a towel but yeah, most of the tubing is bent.
Since you have bends right after the fitting, expect the gap to be wider. That's normal. Just make absolutely sure that the end of the tubing is touching the fitting wall and that there are no gaps.

Most times, leaks happen with compression fittings when the hose isn't on completely and people tighten the collar. That normally happens because the hose is bent, pulling the hose away from the fitting wall. Bending the hose also makes the hoses circumference wider, which makes it harder to tighten the collar. Hope this helps.
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post #10 of 10
Thread Starter 
Quote:
Originally Posted by mhaneline View Post
Since you have bends right after the fitting, expect the gap to be wider. That's normal. Just make absolutely sure that the end of the tubing is touching the fitting wall and that there are no gaps.

Most times, leaks happen with compression fittings when the hose isn't on completely and people tighten the collar. That normally happens because the hose is bent, pulling the hose away from the fitting wall. Bending the hose also makes the hoses circumference wider, which makes it harder to tighten the collar. Hope this helps.
Thanks a bunch all. The tubing is all the way on the fitting


And yeah I've cut my hands cause they were dry from being out in the cold ><
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