Bonyan Tajhiz Jonoub, materials engineering company

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Steam, Air, Water Equipments

Steam, Air, Water




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Dry Barrel Hydrant

Dry barrel hydrants get their name from the fact that water is drained or pumped from the barrel when the hydrant is not in use. Dry barrel hydrants are pressurized and drained through the workings of a main valve located in the base of the hydrant. When the main valve is opened, the barrel is pressurized; when the main valve is closed the barrel drains. This type of hydrant may be used almost anywhere, but is especially suited to areas where freezing weather occurs.

In a dry barrel hydrant, a single main valve is located in the base of the hydrant adjacent to the inlet connection. In addition, the dry barrel hydrant is equipped with an automatically operated drain valve. When the main valve is closed, the drain valve automatically opens, draining all water from the barrel of the hydrant. When the hydrant is opened, the drain valve automatically closes. The main valve is located below the normal frost line to protect the hydrant from freezing. This allows the dry barrel hydrant to be used almost anywhere. Three variations of dry barrel hydrants are defined below.

Wet Barrel Hydrant

There are a number of advantages to wet barrel hydrants which is why they are so popular in climates where freezing is not an issue.

They are simple in construction. All the mechanical parts are above ground and easily accessible.

The hydrant can be easily raised or lowered by adding or removing riser sections when final grading in new construction areas is different than originally expected. Thus they can be set to a proper height without expensive modifications.

The valves operate independently so adding a second or third hose line to the hydrant during a fire doesn't require a shut down.

Children can't remove the caps and drop foreign objects down the body.

These hydrants are easy to recondition and place back into service. A 100+ year life expectancy is not unreasonable for those wet barrels that are well constructed. The only reason that 1800s vintage hydrants are not presently being overhauled and returned to service when removed is due to their lead nozzle and valve carrier seats which raise water quality concerns. Thousands, however, still remain in service.




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