Water distribution level 3 Questions With Correct Answers

A factor or value used to indicate the smoothness of the interior of a pipe - Answer Cfactor Major parts of water distribution - Answer Pipes, storage facilities, pumping stations, valves ,fire hydrants, meters, and other appurtenances Main purpose of water storage facilities - Answer To provide sufficient amount of water to average or equalize the daily demands on the water supply system Types of storage facilities - Answer Clear wells, elevated tanks,standpipes,ground level storage tanks , hydro pneumatic or pressure tanks, and surge tanks 20 psi - Answer Absolute minimum pressure 35 psi - Answer Minimum working pressure Basic requirements of pipes - Answer Adequate strength, durability,maximum corrosion, resistance and no adverse effect on water quality Four classes of working pressure are commonly encountered - Answer 100,150,200,250 psi Push on and mechanical joints are most often used for - Answer Ductile iron pipe. Flanges, restrained, flexible, and sleeve joints are also used Flange joints - Answer Not flexible Restrained joints - Answer Prevent movement Flexible joints - Answer Permits one joint to move PE pipe - Answer Has the highest cfactors 150 Pipe protection - Answer Paint Rock must be excavated - Answer 6inches Ladder must b located - Answer 25 ft and 3ft above hole Laying pipe is also called - Answer Stringing The horizontal shoring members are generally referred to as - Answer Stringers or walers Shield shoring - Answer Consists of a rectangular box that must b open on the top and bottom and usually the ends are open too Solid sheeting - Answer Used when materials will not stand in a vertical position or not practical to slope the trench