What is a monitor hydrant?

A monitor hydrant is a specially configured fire hydrant. In addition to standard hose and pumper outlets, it has a special elbow on which can be mounted a fire fighting monitor. Monitors are uses in such places as oil fields, refineries, tank farms, petrochemical plants or other locations that have dangerous or flammable compounds. The monitor directs a spray of water, or other fire-fighting fluid towards the hazard. It can be turned on and left so that personnel can leave the area of immediate danger while the hydrant continues to hose the fire, chemical spill, or other dangerous situation.