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Question DetailsAsked on 11/27/2016

does fairfax county, va require bracing/ supports to be installed on expansion tanks

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2 Answers


I could not find anything along that line if mounted on rigid piping in upright configuration, and I have never seen any building code that did require any sort of bracing on a normal (few gallon) diaphragm type expansion tank like this one -

A larger tank, especially a non-diaphragm type which could hold many gallons of water, would be considered a water tank and require bracing. As would a tank mounted horizontally, which BTW is bad practice - should be upright (pipe coming out bottom so it will work even if the diaphragm fails. The reason a sideways mounted tank, or one in any configuration hanging off piping that is not directly supported or is cantilevered out, is to prevent excess loads on the piping from the weight of the tank and any water in it. I have seen and heard of cases where a diaphragm failed and the weight of the tank cracked the pipe, causing flooding of the area or of the boiler, resulting in unnecessary $ damage.

I would always brace it or support it with plumbers tape (perforated metal strapping) unless it is sitting upright directly over fully supported piping - like the stubup out of the boiler. Easy to provide that bit of protection rather than take the risk, even if not required by seismic code provisions. The plumbing code DOES require that all piping be properly restrained against weight and against free movement, and this would fall under that category.

Here is a link to the entire codes used in Farifax County - enfortunately my older browser will not acces it because of an unrecognized security certificate, but you might be able to open it if you use Windows or a newer browser version -

Answered 4 years ago by LCD



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Answered 4 years ago by Member Services

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