pk.sax
RIP bum
- Joined
- 19/8/10
- Messages
- 4,362
- Reaction score
- 415
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:
This time:
Notice the discolouration in that plastic.
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:
This time:
Notice the discolouration in that plastic.