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1/4" Ffl Fitting On Regulator Gas Out

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pk.sax

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I've had had 2 fail now, 1/4" FFL fittings I bought to put on the Cornelius Dual Reg.

The first time I really couldn't make sense of what made it fail, it was not through the thread for overtightening.. I was gentle. I could hear the gas whizzing out so I caught it in time and swapped the disconnect, saved the cylinder.

This time it failed with no warning, so I am out of gas... But I think I've found why they are cracking. I'd swapped the disconnects on my kegs to pour a different keg and that one having dropped in carb obviously started to take some gas out of the cylinder. I think it is the chill effect caused by the rapid gas flow making the plastic brittle and break under any stress it might be under. When I pulled the gas line out I found the grey collar had gone brittle and broken off a few peices too.

On the first one breaking I contacted the retailer and he offered to replace it, no problems there.

I wonder if anyone else has used these on the regulator as gas disconnects and had a similar experience?
The NRVs are ususally a little way down the line and don't touch the regulator itself, which I think is the cause: the brass on the reg cooling down so much with gas flow making the disconnect go brittle.

See pics of first failure:
image.jpeg
image_1.jpeg

This time:

Notice the discolouration in that plastic.
 

pk.sax

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Nobody seen anything like this before?
 

MetalRooster

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Can't say that i've seen it - I've got a single reg and was planning to replace the barbed fitting with an FFL, but after reading this I'm not so sure! Don't really like the idea of losing a whole cylinder of gas just to test the theory.
 

zabond

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Strange!! you could use a stainless/brass/metal fitting I got a ss one from a industrial tool shop Total Tools
 

RdeVjun

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Looks to me like the routing of the gas line is placing plenty of stresses on the fitting, I'd put an elbow on the reg or tension- relieving 'pipe loop' in that line directly after the reg as there's nearly a 180 degree bend in it, could even be exacerbated by door closure. The chilling it gets won't make life any easier for it, while the discoloration is indeed suss.
HTH! :icon_cheers:
 

Ross

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I've never known this problem before & I'd be very surprised if it's caused by cold. The discolouration at the break looks like a possible manufacture flaw to me, but i've forwarded the pics to John Guest for comment.


cheers Ross
 

TidalPete

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Is your gas cylinder steel or aluminium?
From looking at the pic that stain looks suspiciously like a rust stain? Either way, a ss fitting would solve all your problems.
 

pk.sax

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Thanks for the feedback guys.

Yea Ross, last time the discolouration was very faint, I didn't give it much though, put it to plastic fracture. This time it is more pronounced, obviously a breach happened and since it wasn't caught in time it got prolonged exposure. Anyway, would be interested what JG say about it. I was using these purely to keep it all JG at the business ends.
I get that much of HB is experimenting but it is fantastic when retailers like you give things attention like this.

Cheers

PS: cylinder is alu mykegonlegs, the 6.8 Kg. a bit annoyed but at least the inline nrv saved the kegs :)
 

pk.sax

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Hey Ross, any reply from them ever came back?

Those barbs and the line to fridge gets really cold when the gas is flowing.
 

Ross

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No, they didn't... I've just sent a follow up email, so hopefully will get a prompt reply.


cheers Ross
 

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