How to Open a Fire Hydrant

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Hydrant Valve • Most fire hydrant valves are not designed to throttle the water flow; they are designed to be operated full-on or full-off. The valving arrangement of most dry-barrel hydrants is for the drain • valve to be open at anything other than full operation. Usage at partial-opening can consequently result in considerable flow directly into the soil surrounding the hydrant, which, over time, can • cause severe scouring. Gate or butterfly valves can be installed directly onto the hydrant orifices to control individual outputs and allow for changing equipment connections without turning off • the flow to other orifices. These valves can be up to 12 inches in diameter to accommodate the large central steamer orifices on many US hydrants. It is good practice to install valves on all • orifices before using a hydrant as the protective caps are unreliable and can cause major injury if they fail. • When a firefighter is operating a hydrant, he or she typically wears appropriate personal protective equipment, such as gloves and a helmet with face shield worn. High-pressure water coursing • through a potentially aging and corroding hydrant could cause a failure, injuring the firefighter operating the hydrant or bystanders. • In most jurisdictions it is illegal to park a car within a certain distance of a fire hydrant. In North America the distances are commonly 3 to 5 m or 10 to 15 ft, often indicated by yellow or red • paint on the curb. The rationale behind these laws is that hydrants need to be visible and accessible in an emergency. • https://en.wikipedia.org/wiki/Fire_hy... • http://www.johnsonvalves.co.uk/fire-h... • http://www.safequip.co.za/product/fir... • http://www.brooksbank.co.uk/naval/hyd... • https://www.flowstarvalveshop.com/pag...

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