ScubaSteve
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You're gonna need a hole saw and some way to keep the keg and drill centered. Alternatively, you *MIGHT* get away with a step drill bit....depends on the od of the pipe...which is less than 2" off the top of my head. This second method would be preferred...hole saws can be a real PITA.
Brazing is probably a better choice than soldering, that's a very large joint and you need the most strength you can get. You might be able to find a spud large enough to accomodate the 2" triclover fitting, at least you'd have a good shoulder for fitup...and then the solder would probably be enough. Otherwise, you can go with a Safetysilv 30ish alloy versus the full 56%...it is quite expensive...but your color will be slightly off if that matters. Cadmium free silicon bronze will probably work too, but I'd be very careful about the ingredients, this is usually not food grade.
As stated, why 2"? You could get rid of a lot of obstacles by going with a 1" triclover, which will provide PLENTY of flow.
Brazing is probably a better choice than soldering, that's a very large joint and you need the most strength you can get. You might be able to find a spud large enough to accomodate the 2" triclover fitting, at least you'd have a good shoulder for fitup...and then the solder would probably be enough. Otherwise, you can go with a Safetysilv 30ish alloy versus the full 56%...it is quite expensive...but your color will be slightly off if that matters. Cadmium free silicon bronze will probably work too, but I'd be very careful about the ingredients, this is usually not food grade.
As stated, why 2"? You could get rid of a lot of obstacles by going with a 1" triclover, which will provide PLENTY of flow.