Fire Hydrant Threads

The impressions on the paper give the number of threads per inch tpi.

Fire hydrant threads.

3 you may also use this same method to determine the outside diameter od of a hose. If only a worn thread is available send the male fitting to national fire equipment ltd for an accurate. The larger out lets sometimes called the steamer nozzles or connections are 4 inch or 4 5 inch nst. Dia thds inch ns national standard follows nst also nh 2 5 7 5 4 5 4 austin tx ns 4 6 charlotte nc ns 4 6 chicago il 4 5.

The hydrant outlets usually have male national standard threads nst to mate with fire hose couplings. Qrfs carries a wide range of fire hose adapters designed to join fire hose fire hydrants and fire department connections with incompatible thread standards. Do not measure a badly worn thread. Assured flow s hydra eze compound is a premium synthetic food grade non drying thread sealant and anti seize compound formulated with a balanced blend of ptfe and other lubricating solids homogenized into a non melting grease carrier.

X 4 tpi threads per inch. Anti seize lubricant for fire hydrant hose nozzles. Fire hydrant connections carry hose pumper hose city nom. The smaller outlets sometimes called the hose nozzles or connections are 2 5 inch nst.

Most fire hydrants have two 2 5 inch hose connection outlets with 7 5 threads per inch tpi and one 4 5 inch pumper connection outlet with 4 threads per inch. Hydrants have 5 1 4 bonnets upper barrels safety flanges and lower barrels and are marked 5 1 4 even though the main valve opening is 4 1 2. Both the odm and tpi are needed. Seat ring removeable without removing lower barrel.

The permit will generally require a hydrant meter a gate valve and sometimes a back flow preventer. 4 1 2 m v o.