Fire hydrants shall be rated for a working pressure of 250 Psig. (1725 kPa); Fire hydrants shall be of the compression type, opening against the pressure and closing with the pressure. Fire hydrants shall have a 4-1/2” main valve opening and a minimum inside lower/upper barrel diameter (I.D.) of 6” to assure maximum flow performance. Pressure loss at 1,000 GPM shall not exceed 4.75psi through a 4.5” Pumper Nozzle.; The Fire hydrant shall be painted ALUMINUM. Fire hydrants shall be three-way in design, having one 4 1/2” NST pumper nozzle and two 2- 1/2" NST hose nozzles. The nozzles shall thread counterclockwise into hydrant barrel utilizing O-ring seals. A stainless steel nozzle lock shall be in place to prevent inadvertent nozzle removal.; The bonnet assembly shall provide an oil reservoir and lubrication system that automatically circulates lubricant to all stem threads and bearing surfaces each time the hydrant is operated. This lubrication system shall be sealed from the waterway and any external contaminants by use of o-ring seals. An anti-friction washer shall be in place above the thrust collar to further minimize operating torque. The oil reservoir shall be factory filled with an FDA approved, non-toxic oil lubricant which will remain fluid through a temperature range of –600 F. to +1500 F.; The operating nut shall be a one piece design, manufactured of ASTM B-584 bronze. It shall have a 1 1/2” pentagon shaped nut. The operating nut shall be affixed to the bonnet by means of an ASTM B-584 bronze hold down nut. The hold down nut shall be threaded into the bonnet in such a manner as to prevent accidental disengagement during the opening cycle of the hydrant. The use of set screws as a means of retention is unacceptable. A resilient weather seal shall be incorporated into the hold down nut, for the purpose of protecting the operating mechanism from the elements.
