Dry barrel fire hydrants are designed to prevent the water freezing for as long as possible. However, there have been cases where this design has failed. This occurs when the drain valve or the main valve in side stop working or don’t function as well as they should.
How do you keep fire hydrants from freezing? The valve seal is actually buried several feet deep, depending on the “frost level” for a given area, so that any standing water in a pipe is insulated sufficiently by soil. How do you drain a fire hydrant? If hydrant fails …
How do fire hydrants keep from freezing in the extreme cold?
The question has been answered here. I wanted to add that in this weather, hydrants can freeze. When the temp is below freezing we always keep that in mind and find a second hydrant incase the first one is frozen. A hydrant can freeZe two ways. One way is the valve has a leak causing water to bypass it and freeze.
In these types of hydrants, the water level is usually kept well below the freezing line (20’-30’ depending on the area)to prevent freezing, and it usually only results in a second or so delay in the fire department receiving water.
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Why Don't Fire Hydrants Freeze and Explode? Video Answer
Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher