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Private Fire Hydrant Maintenance Report TOWN OF BRIGHTON Office of the Fire Marshal The purpose of this Standard is to clarify the requirements for the testing, inspection, maintenance, and marking
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fire hydrants are all around us these above-ground pipe fittings can supply flows upwards of 1500 gallons per minute to save lives and put out fires across the world we all know what fire hydrants do but how exactly do they work called fire plugs fire pumps Johnnie pumps fire hydrants these life-saving pipe fittings have been around since 1801 their designs vary by country of origin but they usually have a connection point to hook up a fire hose and a nut or bolt to turn on what will start the flow essentially every fire hydrant is just an attachment to a main potable water line if you see one on the side of the road theres likely a potable water line running underneath that connects the hydrant valve through a pipe called a riser its important to note that normal hydrants dont alter the pressure or flow of the water in any way they simply function as valves so firefighters can utilize the already present pressure in the water pipes while all of this may sound simple the internal mechanics of a fire hydrant are a little more complex and can vary by region in the us there are two types of hydrants wet barrel hydrants or dry barrel hydrants which well focus on primarily in this video what barrel hydrants are used where freezing temperatures are uncommon in this design water fills the entire hydrant at all times in the valve to start the flow of water is placed above ground this design is usually cheaper to construct and easier to maintain due to the majority of its mechanism being easily accessible dry barrel hydrants on the other hand are used where temperatures routinely drop below freezing and thus in order to keep the water in the hydrant from freezing the valve is placed below the areas frost line the nut to turn the valve on is usually placed on top of the hydrant in this design to turn the long valve running through the hydrant and the riser these two hydrant designs encompass the majority of fire hydrants in the US and even many parts of the world however their complexities and intricacies dont stop there other important aspects to note would be that the flow of a hydrant isnt variable during operation their valves are designed to be totally open or totally closed coupling this with the that each hydrant is only a valve and usually not a pump the output of the water is solely dependent on the pressure available to the hydrant at that point in the water line the higher the pressure the more water the hydrant can output to stop a fire common flow rates for hydrants across the us range from less than 500 gallons per minute all the way up to above 1500 gallons per minute higher flow rate hydrants are usually needed in commercial areas in dense residential areas essentially where theres potential for larger fires the hydrants with the highest flow rate deliver enough flow to fill a backyard swimming pool in just three minutes in the us the colors of hydrants can also indicate their type white means public system hydrant yellow means its...