| Popis: |
IN recent years, great progress has been made in the prevention and elimination of cross-connections and inter-connections in the water distribution system of buildings and premises. Vacuum breakers, atmospheric gaps, barometric loops, back flow preventers, surge tanks, and greater care in the adequate sizing of water services and distribution piping have been utilized in their proper locations to eliminate the possibility of back flow or back siphonage. There is one possible source of pollution to which little attention has been given which, in the opinion of the Detroit Department of Buildings and Safety Engineering-and the Department of Health, is dangerous and should be corrected. Wherever climatic conditions develop freezing or lower than freezing temperatures over a protracted period of time, it is common practice in structures that have no basement, or cellar, to iAstall a shut-off valve in the water service piping below the frost level. This valve has a drain opening so the piping on the building side of the valve mav be drained into the ground when the valve is in the closed position. The valve used in Detroit is a brass " Hydrant Stop, Cap Pattern, Flatway, with Tee Handle." The rules and regulations of the Department of Water Supply of the City of Detroit provide |
