Fire Hydrant System

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Overview of Fire Hydrant System

A fire hydrant is a visible connection point placed in defined locations for firefighters to tap into a water supply. All buildings, parking areas, roadsides, mines, industrial areas, etc. must have fire hydrants with a connection to a water service network. They are designed to provide the water required by firefighters instantly to fight and extinguish a fire. Till the 18th century, underground fire hydrants were used. However, from the 19th century onwards, above-ground pillar-type fire hydrants become popular and mostly used. A fire hydrant is basically a pipe with the control of a valve through which water flows from a water main in order to put out a fire

Working of a Fire Hydrant

Fire hydrants with a variety of valves and connection points are seen in many places. In the event of a fire breakout, firefighters locate the fire hydrants, connect their hoses and then pump a large volume of pressurized water to put out the fire. A special pentagonal wrench is used to remove the valve cover of the hydrant. Then after attaching the hoses, the firefighters open the valve for the water to flow.

Types of Fire Hydrants

There are two types of Fire Hydrants: Wet hydrants and Dry hydrants

Wet Hydrant

Wet hydrants are widely used in places where there is no problem of freezing. In such types of fire hydrant systems, the water in the main supplies the hydrant close to the surface. So, in cold weather conditions, it is susceptible to freezing.

Dry Hydrant

A dry hydrant system stores the water below the ground. The Earth’s temperature is usually higher than the cold environment temperature in cold regions. So, the possibility of freezing can be prevented by this arrangement. When the dry hydrant system is required to be used, firefighters open a valve on top of the hydrant and engage their hose in it. This causes the drain valve to open inside the hydrant. This allows the water to come through which the firefighters use against the fire.
Difference between Wet barrel Hydrant and Dry barrel Hydrant The main differences between a wet hydrant and a dry hydrant are mentioned below: Wet Hydrant or Wet Barrel Hydrant Dry Hydrant or Dry Barrel Hydrant Wet Hydrants are used where water-freezing issues are not present Dry barrel hydrants are used in cold regions where the temperature routine drops below water freezing temperature. In the wet hydrant design, the water is placed aboveground The water in the dry barrel design is kept below ground to avoid freezing. A wet Hydrant is easier to construct and cheap. On the other hand, dry barrel hydrants are costlier and difficult to construct. Maintenance of wet barrel hydrants is easier due to easy access. Maintenance is comparatively difficult. Table 1: Wet Barrel Hydrant vs Dry Barrel Hydrant Components of a Fire Hydrant System The main components that constitute a fire hydrant system are:

Fire Fighting Pumps & Accessories

Fire Brigade Connections Wiring & Instrumentations Maintenance Valves Color Coding of Fire Hydrants Following NFPA standards, all fire hydrants are color-coded. These colors indicate the expected flow during the operation. Usually, the top caps of the fire hydrants are painted. The following table provides the common colors according to the flow. Color-Coding Flow Meaning Light Blue/Blue >1500 GPM Very good flow, suitable for industrial applications. Green 1000-1500 GPM good for residential purposes Orange 500-999 GPM marginally adequate Red <500 GPM Low flow, inadequate Table 2: NFPA color coding of fire hydrants Codes and Standards of Fire Hydrants The codes and standards that are used as guidelines for designing fire hydrant systems are: NFPA 1 NFPA 25 NFPA 291 AWWA A112.21.3M BS EN 14384 BS 750 DIN 3222 DIN EN 14339 AS 2419 FP-009 IS 3844 IS 13039

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