what is fire hydrant in industries and how it works?

Answer 1

An industrial area generally has a 'Fire Water Ring Main' around and within the area which is ALWAYS pressurised with water at the required pressure and runs mainly underground.

At strategic points in its piping a 'Fire Hydrant Stand Pipe' is welded into the ring main and projects above ground.
This is fitted with Hose Connector(s) and Valves to which the Fire Department of the Company can connect fire hoses and Monitors (cooling sprays), and if required (as in Oil Industries), foam generators can be used for emergemcy fire fighting as required.

Answer 2

In the United States, a commonly found hydrant will have 3 outlets and a 5 sided stem for a hydrant wrench on the top ( not 4 sided as someone mentioned ).
This 5 sided stem is designed that way to help reduce unauthorized use.

A 3 outlet hydrant has normally two 2.5 inch male threaded connections and a "steamer" connection between them, of a normal diameter of 4.5 inches. The threads are normally a NH
( National Hose) thread and this was called NST
( National Standard Thread ) in years past.

Water flow in GPM, and flow pressure, will vary widely but the hydrants are the end of a riser connected to a main water line.

They will be designed to permit the barrel
( riser) to drain out after use for protection against freezing.

LDH ( large diameter hose ) is not canvas.
It will be found as a cotten jacket with a rubber lining or synthetic material as a liner/jacket.
LDH is usable off of any of the outlets whether the steamer or butts is chosen and the appropriate adapter employed.

Specific colors or tags may be found that would indicate the normal flow rate of the hydrant.

Some hydrants are on a hi pressure hi flow water main system. These are independant of general public mains.

Hydrants will open either with the pressure or against the pressure and must be done in a deliberate manner and especially not slammed shut. The resultant water hammer from abruptly stopping a large flow of water can and does do serious damage.

Hydrants are not to be confused with the sprinkler siamese dual female 2.5 inch NH threaded connections on the side of sprinklered buildings. The Fire Dept will connect to a siamese like this to supplant the flow in the sprinkler system in event of a fire.

There are of course variations in hydrants and I am limiting this to general commonly found hydrants.

HTH
Deric

Answer 3

A fire hydrant is any valve and hose connection joint that provides sufficient volume of water, under the nominal pressure of the water system it is connected to, to rapidly put out fires, or to rapidly fill tanks on fire trucks and industrial equipment.

Sufficient volume is attained through large diameter (4", 6", 8") valves and fittings. Hydrants are almost always connected to large diameter water mains (8" and up), or to a large gravity-fed or pressurized tank.

The top of the hydrant generally has a square fitting for a large wrench that operates the valve. The hose fittings are generally made for large-diameter canvas fire-fighting hoses, and are designed for rapid attachment of the hoses. The hose fittings have caps to prevent foreign objects from getting inside and fouling the valve. There are usually 2 or 3 hose fittings on a hydrant.

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Answer 4

A fire hydrant, or what I know to be a fire hydrant, is a type of valve strategically located on streets that in connected to the water mains of a town or city. It is designed so that fire hoses can connect to them utilizing the water mains to hose down fires.