What type of threads are used in a hydrant?
The operating threads of the hydrant shall be so designed as to avoid the working of any iron or steel parts against either iron or steel. The operating stem and operating nut threads shall be square or acme type.
What is the size of a hydrant?
Classification and Size:Hydrants are classified by the main valve size, number and size of hose and pumper nozzles. Hydrant size is designated as a 5 ¼ “ , size being the inside diameter of the main valve seat opening.
What happens when a hydrant breaks?
Hydrants shall be so designed that, in the event of accident, or breaking of the hydrant above or near grade level; the main valve will remain closed.
What pressure is needed for fire hydrants?
RATING Fire hydrants shall be rated at 250 psi water working pressure, tested at 500 pounds hydrostatic for structural soundness in the following manner: 500 pound hydrostatic test supplied from the inlet side, first with the main valve closed for the testing of the valve seat: second, with the main valve open for testing of the drain valves and the hydrant barrel. Testing to be complete in accordance with AWWA C-502 and UL & FM requirements.
How many nozzles are in a hydrant?
The nozzle section shall consist of two-2 1/2” hose nozzles to the specified thread designation (NST or other, as specified) and one pumper nozzle 4 ½” in diameter to the specified thread designation (NST or other, as specified), or other combination of nozzle outlets, including independent hose gate valves, as specified.
How to determine a hydrant length?
Length:Hydrant lengths are determined by depth of trench below ground level. Lengths are in multiples of six inches. Barrel:Upper section of barrel (nozzle section) contains the hose and pumper nozzles. The water way is uniform in diameter for entire length of barrel.
How do end hydrants connect to main?
END Hydrants shall be connected to the main by a 6” fusion bonded, epoxy coated mechanical joint or