Information presented and opinions expressed should not be relied upon as a replacement for consulting services. Comments which do not contribute, are not relevant, are spam, or are disrespectful in nature may be removed. Fire protection and life safety systems constitute a critical component for public health and safety and you should consult with a licensed professional for proper design and code adherence.ĭiscussions are solely for the purpose of peer review and the exchange of ideas. The views, opinions, and information found on this site represent solely the author and do not represent the opinions of any other party, nor does the presented material assume responsibility for its use. See our Privacy Policy and Terms of Service. We respect your privacy and personal data. MeyerFire, LLC is a NICET Recognized Training Provider and International Code Council Preferred Education Provider.Īll text, images, and media Copyright © 2023 MeyerFire, LLC We promote the industry by creating helpful tools and resources, and by bringing together industry professionals to share their expertise. Our goal is to improve fire protection practices worldwide. is a startup community built to help fire protection professionals shine. These drain holes act as weeps which slowly drain the hydrant barrel and help prevent freezing. When in the 'closed' position, the valve lowers to block water passage and re-open drain holes at the bottom of the hydrant. When in the 'open' position, the valve at the bottom of a dry barrel hydrant rises to plug drain holes and simultaneously permit water to fill the barrel of the hydrant. Our thrust block calculator can be helpful in sizing these blocks. Unless mechanically restrained, thrust blocks serve as a way to distribute the hydraulic force of the pipe network into the soil. Typically shaped as a pentagon, the stem nut will turn the operating stem of the hydrant and raise the valve to an 'open' position when turned with a hydrant wrench. The stem nut is the key to operating the valve within the hydrant. Louis, for instance, have hydrants with only a single pumper outlet. ![]() While the typical hydrant described above is the most common type, other combinations certainly exist - downtown St. The size and number of the outlets serve as one limit to the capacity of the hydrant. ![]() The latter outlet gets its name as it is often the preferred choice for the fire department to connect and feed pumper trucks. NFPA 291, the Recommended Practice for Fire Flow Testing and Marking of Hydrants, suggests hydrant colors as Red/Class C, Orange/Class B, Green/Class A, and Light Blue/Class AA for Less than 500 gpm, up to 1,000 gpm, up to 1,500 gpm, and 1,500 gpm and more, respectively (NFPA 291-2019 5.2.1.2).Ī traditional dry barrel fire hydrant contains three outlets: two 2 1/2-inch (65 mm) side outlets and a single 4 1/2-inch (115 mm) or 6-inch (150 mm) "pumper" outlet. ![]() Some jurisdictions paint hydrants or hydrant bonnets to identify the capacity of the hydrant. ![]() Because hydrants need to be quickly accessed during an active fire, hydrant outlets need to be installed tall enough to allow a full-revolution of a hydrant wrench from the lowest outlet. While the dimension from the bonnet to the flange of the hydrant is standard, the height of the flange becomes important during installation as it determines the height of the outlets. The flange at the base of the hydrant is the point of connection for the hydrant to the rest of the barrel. Our friction loss tool can be helpful in estimating loss through these pipes. While older systems often connect hydrants with 4-inch branch pipe, a minimum of 6-inch pipe should be used to limit pressure loss and permit greater flow capacity. The branch pipe serving the hydrant from the city main is one restriction for the overall capacity of a hydrant. The conical cap for the hydrant, or bonnet, holds the operating stem nut in place and protects the hydrant from mechanical damage and water penetration.
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