Collections 2 Study Guide Latest Updated

4. In collection systems, why have bar racks or screens at the list stations been eliminated by some agencies? {Ans: They have been removed because most pumping units are equipped with open impellers or closed two-port impellers sized to pass solids up to the size of a 2.5 inch diameter sphere and it also eliminates the necessity to visit the lift station more than once a day.}8. What are the three types of float controllers? {Ans: Rod-attached floats, steel tape, cable, or rope attached floats, Mercury switch float controls.}9. Ball floats are usually attached to a float rod, the float rod is equipped with brass stops. explain how these stops are used to select the wet well rise and fall levels. {Ans: Thes stops determine the level of the wastewater in the wet well. The wet well rise and fall levels are selected or Changed by moving the rods stops to new positions on the float rod.}What problems develop in a wet well that is too large? {Ans: If a wet well is too large, solids will tend to accumulate on the bottom because the wet well will be acting as a settling tank, accumulated solids