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Old 08-18-2012, 06:03 PM   #1
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Default Sterile Welding Ball Valve

I'm sure this has been asked before, but I can't seem to find an answer to my specific question. Here goes:

I bought a stainless steel 10.5 gallon brew kettle and want to add a stainless 1/2" ball valve. I've heard mixed reviews of the weldless add-on valves and my neighbor (a plumber and steelworker) has offered to weld one onto my kettle for me instead. However, I've read that you need to be careful to have a sterile weld. Does "sterile" refer to eliminating any places for microbes to hide near the weld site (i.e., a smooth weld) or does "sterile" mean something else?

Thanks in advance for the help!

A Newbie

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Old 08-18-2012, 06:12 PM   #2
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Its sanitary welding, where you use a back purge and a few different techniques. Your boil kettle does not need to be welded this way.

If you are modifying a fermenter or anything that touches your beer after it is cooled then it is recommended to use sanitary welding techniques.
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Old 08-18-2012, 07:04 PM   #3
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When you get your fittings welded on just purge the rear of the weld, or you can do what I do instead of wasting argon to fill the kettle and welding it out of position. I use solar flux B on the back side of the weld after I put a small tack to hold it in place. I welded the first one without. It would be nice to be able to make a copper ring on the backside of the weld, that would make life soo much easier and you wouldn't have the carbide precipitation from no purge.
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