What do the markings on a fire hydrant mean?

An orange-colored “R” inside a circle indicates that the hydrant is in a regulated pressure zone. An orange arrow indicates the direction of water flow on a dead-end main. An orange arrow and a vertical bar indicate the last hydrant and the direction of water flow on a dead-end main.

What do fire hydrant markings designate?

those used by the local fire department. … Fire hydrant markings can be used to designate: A. flow capacity.

What do numbers on fire hydrant mean?

The two numbers on the sign indicate the size of the water main (top number) and the distance from the sign (lower number). Modern signs show these measurements in millimetres and metres, whereas older signs use inches and feet.

What is the required pressure for fire hydrant?

1.8. 4 The pressure in the hydrant pipe work shall be kept constant at 6 Kg/cm2. In the event of fire when any of the hydrant valve in the network is opened, the resultant fall in header pressure shall start the AC motor driven fire pump through pressure switches automatically.

What is a yellow H?

Yellow “H” hydrant signs indicate the location of the hydrants. Mounted on a small post or nearby wall etc., the two numbers indicate the size of the water main (top number) and the distance from the sign (lower number).

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Is fire hydrant water drinkable?

Hydrant flushing is necessary to test the hydrants to make sure adequate flow and pressure is available. Flushing is also done to remove sediment from the pipes in order to maintain water clarity and quality in the distribution pipes. Your water is safe to drink.

Why do fire hydrants have blue tops?

The colors indicate the rated water-flow capacity of that particular hydrant: Red indicates water-flow capacity of less than 500 gallons-per-minute (GPM). … Blue indicates water-flow capacity of 1,500 or greater GPM.

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