Coupler spacing on kettles.

Thu Mar 10, 2011 8:05 am

I just bought two gigantic, shiny, new, kick ass kettles for use as a Boil Kettle and a mash tun. They're both 20 gallon Update International (megapot) kettles, and I'm going to have a local welder weld some couplers for ball valves, thermometers and a thermowell. Is there a standard spacing for flat bottomed homebrew kettles?

How far from the bottom should I weld the coupler for the ball valve to fit under a false bottom, and the thermometer coupler so that the dial is clear of the valve handle and the thermo stem is clear of the false bottom. Thanks everyone!
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andy77
 
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Re: Coupler spacing on kettles.

Thu Mar 10, 2011 10:02 am

It depends.

Typically the valve is mounted above the false bottom, with a piece of tubing from the valve through the FB to the bottom of the pot. This is done to reduce the deadspace below the FB and increase your mash capacity. If you don't care about that, then I'd guess you could mount the coupler as low as possible on the kettle with the FB above it as you say. If you are attaching anything on the inside of the valve coupler, you probably want to leave at least a quarter of an inch clear from the inside bottom of the pot to the coupler.

The distance from the valve coupler to the thermo coupler will depend on the thermo and valve that you are using. Blichmann's standard dial thermo has a 3" dia face, so you may need 3" between the centers of the coupler holes. The blichmann thermos with an adjustable viewing angle could be rotated to require less clear space.

I'd recommend you have all the pieces in hand before you start drilling holes and mounting the couplers. That way you know exactly how much space you need for the specific components you are using.
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Re: Coupler spacing on kettles.

Sat Mar 12, 2011 7:18 pm

I got those pots too. Be careful with them they are a grade of 400 SST that takes on corrosion rather easily. The Chinese metal supplier didn't use enough chrome I suspect.

Buy yourself 10 or so pounds of Ascorbic acid and keep it handy to strip the rust away and passivate the steel as it needs it - - -and it will need it.
The flea bay is a good source.
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