Actually, the pressure in the tank would indeed push back into the cold
water supply. If there are any accumulators, they would buffer the pressure
change. Otherwise, sooner or later (probably sooner) some over pressure
valve somewhere will give, whether it is the one on your tank or your
neighbors tank or some valve attached to the water supply. Your water lines
in your house are not closed - they are open to the city supply, and all of
your neighbors houses. Unless, like I said, there is a check valve
somewhere. Unless you have, for example, a well. Then the pressure would
push water into your accumulator (water tank). Since it is probably a small
tank, your water pressure would rise until a check valve opens or something
But compared to gases they don't compress.
Not enough to make any difference in the experiment in the video. Unless
there was somewhere to "push" the water. The hole would be essentially
plugged. The plug could blow.
Hey...it's "about" the only thing I remember from my water management class
back in the early 70s.
In most municipal water supplies in North America, the answer is yes.
In Zambia our water supply filled what was basically a "stock tank"
in the attic and everything was gravity fed from there, so the
"geyser" couls cause reversion flow without any trouble. In the hot
season (3/4 of the year) we just turned the geyser off and got very
warm water direct fron the tap. Needed to refrigerate water for
drinking, unless you were drinking tea.
Seems strange that hot water heaters aren't designed to rupture in
some less destructive manner. To have the bottom blow out so that the
thing flies into the air like a rocket seems like a terrible design.
That's why we use thermostats and T&P valves. Not to mention, if the
pressure in a home water system ever came anywhere near 300+ psi,
something elsewould let go first. Like those plastic toilet valves, or
the washer hoses.
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