Question: A sanitary sub - collector serves four housing developments in the municipality of Humacao. One development has 7 5 private residences, the second has 1
A sanitary subcollector serves four housing developments in the municipality of Humacao. One development has private residences, the second has private residences, the third has private residences, and the fourth has private residences. The design flow rate of the subcollector is gallons per day. That pipe has a diameter of inches and a slope of The pipe is made of plastic PVC and wastewater flows through it by gravity until it reaches a sanitary sewer pump station, which is operated by the Puerto Rico Aqueduct and Sewer Authority. The depth of the invert of the subcollector at the point where it enters the wet well of the station is as shown in the figure below.
In the wet well, which has a height of the maximum depth of the wastewater is and the minimum depth is The surface area of the wet well is rectangular, with a width of In the well there are two constantspeed submersible pumps, which alternate automatically. The hydraulic capacity of each of the pumps is gallons per minute and their efficiency is percent. The duration of each pumping cycle at the station is minutes and seconds. The pump station's cast iron power line has a diameter of inches and an overall length of In this pressure pipe, the friction losses are and the vertical displacement of the wastewater is The wastewater is pumped to a sanitary register whose inverted is located below the ground surface. Downstream of this sanitary register, the wastewater flows by gravity through a plastic pipe PVC inches in diameter and with a slope of until it joins another subcollector that serves two other housing developments and a shopping center.
Determine:
to The hydraulic capacity MGD and GPM of the submanifold that arrives at the pump station.
b The usable volume gallons and cubic feet of the station's wet well.
c The length feet and inches of the wet well of the station.
d Minor losses feet in the line of force.
and. The power hp of each of the pumps in the wet well.
f The velocity of the wastewater feet per second at the subcollector reaching the pump station and indicate if the value is acceptable.
g The velocity of the wastewater feet per second in the pressure pipe and indicate whether the value is acceptable.
h The velocity of the wastewater feet per second in the pipe exiting the sanitary register located downstream of the pump station and indicate whether the value is acceptable.
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