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Home Brew Forums > Home Brewing Beer > Bottling/Kegging > 3/16 inch beer line, 1/4 inch tailpiece, #145 Oetiker = leak
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Old 10-22-2010, 06:43 AM   #1
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Default 3/16 inch beer line, 1/4 inch tailpiece, #145 Oetiker = leak

I'm using 3/16th inch ID 7/16th OD beer line from Superprod in my keezer. This is your common garden-variety 3/16th tubing with 1/8th inch wall thickness. The tubing goes on pretty tight over the 1/4 inch tailpiece. I'm securing them with a #145 single-ear pinch type Oetiker clamp. At anything over 10 PSI, I get a leak at the tailpiece barb. The clamp isn't tight enough.

I bought one-ear non-stepless Oetiker clamps from McMaster Carr by mistake. It seems that the stepless ones are preferred for this application. The single ear pinch type that aren't stepless apparently don't exert even pressure 360 degrees around. There's a gap where a leak can develop.

I measured the circumference of the tubing where it expands over the 1/4 inch tailpiece, and it was 39mm. That gives me a diameter of 12.4mm which is .488 inches, which is just over 31/64ths.

I'm about to order these 52545k51 clamps from MMC, which I think are the same size as these Oetiker Clamp - #13.3 - 1/2" from CHI Company. But before I do, I thought I'd ask what size Oetiker clamp for 3/16th ID 7/16th OD beer line over a 1/4 inch barb do you use?

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Old 10-22-2010, 04:46 PM   #2
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Personally I use standard hardware store hose clamps and have never had a leak, even when pressure testing the kegs at ~60psi. And I reuse the hose clamps, just toss them in some PBW when I replace beer lines.

Connor

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Old 10-22-2010, 05:02 PM   #3
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That's what I'm using right now in place of the Oetiker that was leaking. It works fine, but over time many people have reported that the worm clamps will cut into the plastic. I prefer the neater appearance of the Oetiker clamp. It doesn't have a tail like a worm gear clamp.

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Old 10-22-2010, 05:17 PM   #4
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I imagine it you overtighten the clamp it could cut the hose. But standard hose clamps have been around for decades on everything from cars to appliances and if it was a "common" thing for them to damage what they are used on I am pretty sure they wouldn't be used. Don't overtighten and you'll be fine.

Neater and leaky or drab and functional

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Old 10-22-2010, 05:19 PM   #5
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I appreciate the input on hose clamps. However, I'm more curious what size Oetiker clamps people use in this situation. But anyway it's academic. I've already ordered the clamps in the OP from MMC. I'll report on their efficacy when I get them.

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Old 10-22-2010, 05:22 PM   #6
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Just curious where you where exposed to Oetiker clamps? The only thing I know they are used for is aircraft.

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Old 10-22-2010, 05:32 PM   #7
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I first heard about them on this forum. They are commonly used by many brewers to secure hoses in kegerators and keezers. If you look at brewing equipment suppliers, like Austin Homebrew, Northern Brewer, CHI Company, Keg Connection, Midwest, et. al., you'll find they sell them for this purpose.

I think they are commonly used in automobiles too.

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Old 10-22-2010, 06:32 PM   #8
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I won an auction on ebay for a keg, a dual gauge secondary regulator and 5 gas disconnects with old hoses attached. The hoses were no good and were all attached to the MFL fittings with Oetiker clamps. I tell you they were a PITA to get off and I had no idea how to get em off I finally just twisted them till they broke with a pair of channel locks and I ruined them getting them off and couldn't reuse them.

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Old 10-22-2010, 06:34 PM   #9
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Oetiker clamps are generally single use clamps. they are designed to be cut off.

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Old 10-22-2010, 10:13 PM   #10
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Right. To get one off, you have to cut it open with wire cutters or with the same Oetiker tool you used to put them on. Then you may not be able to get the hose off the barb anyway, so you'l have to cut it off.

Oetiker clamps are the way to go.

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