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hand tighten barbs and fittings - Page 2

post #11 of 28
Quote:
Originally Posted by MrJackson View Post
Why would compression be any different? It's the exact same connection.
They might be talking about the piece that you screw over the actual tubing.
post #12 of 28
I just hand tightened my compression fittings. No leaks so far and its been a couple weeks.
post #13 of 28
I think we are talking about the G 1/4" fitting side with the O-ring. I only hand tighten because when I used a tool for the extra 1/4 turn, it flattened the O-ring and I got a slow drip. I had to drain, replace the O-ring and hand tighten. Never had any other O-ring leaks. It's way easy to over-tighten with a tool IMO. But it's great to see the diverse ways we do this.
    
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post #14 of 28
Quote:
Originally Posted by Lord Xeb View Post
No it isn't, but you don't want them too tight, but you want them stug otherwise they will leak.
says the guy with an h50.. lol

hand tightening is fine... i've never had a leak
post #15 of 28
Quote:
Originally Posted by MrJackson View Post
Why would compression be any different? It's the exact same connection.

Because a compression fitting has a knurled base that you can grip with your fingers and get tight easily,you can't with a regular barb that's why it has a hexagon base so it's not as easy to get tight thats why most people also give them a quick nip with a spanner as they have a hexagon base.

Also how is a regular barb the same connection as a compression fitting? yes they both do the same job but in different ways so i'd hardly class them as the same connection.
Edited by Rapid7 - 4/19/11 at 2:30pm
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post #16 of 28
Quote:
Originally Posted by koven View Post
says the guy with an h50.. lol

hand tightening is fine... i've never had a leak
hand tight works fine aslong as you dont mess with your tubing it can cause them to unscrew. I also had it happen putting wireties on and turning the wiretie to not show the clip and it loosend my barbs.
Edited by Bal3Wolf - 4/19/11 at 4:12pm
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post #17 of 28
Hand tight + quarter turn.
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post #18 of 28
hand tight plus quarter turn works for plumbing but that's also with a lot stronger parts
i wouldn't do the quarter turn with acrylic parts, since they like to crack when they are put under compressive stress, maybe eighth of a turn part finger tight

i know from diy plumbing, over tightening makes things leak, if you have gorilla hands hand tight works fine, i won't even begin to speculate about the actual torque value though that would be more useful
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post #19 of 28
Make sure your barbs have a lip that retains the o-ring under the fitting when you tighten it down.

I use the thick Teflon tape that is rated for pipe threads.
It is much better than the typical thin stuff because you only need one wrap around the threads, so there is much less of a chance for a small piece of it to get in the loop, or trapped under the o-ring.
The key thing when using Teflon tape is to trim it so that it is only covering the threads. You don't want any to get into the loop, or interfere with the o-ring.
Done correctly, the Teflon tape becomes the primary seal, with the o-ring as a backup.

Once the Teflon tape is on, I hand tighten them down until the fitting bottoms out, then just barely snug it tight with a wrench.
Works well for metal and acetel parts, but the extra snug down with a tool would probably be a bit risky on acrylic parts.

A little silicon grease on the o-ring will make for a MUCH better seal than dry also.
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post #20 of 28
Quote:
Originally Posted by homestyle View Post
i've looked at some youtube videos and people were lightly tightening barbs onto openings with a wrench.

is it okay to just hand tighten the stuff down?
Depends on how strong your hands are I guess?

Tip: you can use bicycle cone wrenches to service barbs, etc. They are thin and some come in combo sizes to fit almost all barbs.
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