Question

Which type of fire hydrants are designed for use in climates that have freezing temperatures?

Answer 1

Two types of fire hydrants are generally in use today. The most common is the base valve or dry barrel, in which the assembly controlling the water supply from municipal water system pipes is below the frost line between the foot valve or “piece” and the barrel of the fire hydrant. This common type of fire hydrant. The barrel on this type of fire hydrant is normally dry, with water being admitted only when there is a fire or when the hydrant is flow tested; other uses of this fire hydrant are discouraged. A drain valve at the base of the barrel is open when the main valve is closed, thus allowing residual water in the barrel of the hydrant to drain out. This type of fire hydrant needs to be installed whenever there is a chance the temperature will go below freezing, because the valve assembly and water supply are installed below the frost line determined from climatic conditions.

The second type of basic fire hydrant is the wet-barrel type which is normally limited to the southern and western States where protracted freezing is most unlikely; temperatures inside the hydrant barrel must remain above freezing at all times. This type of fire hydrant usually has a compression valve at each outlet, but they may have another valve in the bonnet that controls the water flow to each of the hose outlets.

Answer 2

In freezing temperatures normal hydrants cannot be used.

Explanation:

• There is a specially designed hydrant to use in locations that have freezing temperature. These varieties of fire hydrants are called as dry-barrel hydrants.
• This dry-barrel hydrant does not store water in it. However, they are connected to a pipe line beneath the ground where the temperature is not freezing. In case of any emergencies the water pipe valve opened.
• Since, the pressure will be very high this can be used to extinguish the fire. On completing the task, the valves will be closed again.

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