Underground firewater systems

An underground firewater system is any part of a firewater system that is underground, including storage, piping, pumps, valves, hydrants, and monitors. The underground firewater system should be a loop with branches off it. This means that, if the underground line is broken or blocked at any point, firewater can still reach the point where it is needed. 

Firewater systems - tanks, pumps, underground pipe. 

Steel pipe should be used aboveground for firewater lines. Underground piping systems can be constructed of steel, cement-lined steel, or high-density... 

During the night the hydrocarbon header was pressured up by a pump about a mile away. Its pressure was greater than that of the firewater header so hydrocarbon liquid flowed into the firewater system. Through a series of underground... 

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