PLEASE ANSWER ONLY THE TRUE/FALSE _A duplex wastewater pump station has two pump

Question

PLEASE ANSWER ONLY THE TRUE/FALSE

_A duplex wastewater pump station has two pumps. In South Carolina, these pumps typically are arranged so they p operation switches: lead pump on, lag pump alternate lead and lag status. This means a wet well has at least three p on, and pumps off. By analogy, a simplex pump station has one pump and will have two pump operation switches: pump on and pump off. A rigid pipe can support the soil overburden and surface dead and live loads without deforming or bending. On the other hand, a flexible pipe deforms, i.e., changes shape, and/or bends longitudinally to transmit overburden and surface and dead loads to the surrounding soil. For South Carolina applications, the most common rigid pipes are concrete and corrugated metal. The most common flexible pipes are plastic (PVC) and HDPE (high density polyethylene). When two or more pumps are connected in parallel at a pump station, the discharge is increased but the pressure head remains the same as with a single pump. Adding a second pump in parallel doubles the discharge from a pump station. Water flows downhill, meaning it flows from a region with higher EGL (region A) to a region of lower EGL (region B), even though region B may be at higher elevation with respect to mean sea level (z term in the modified Bernoulli equation) Cavitation in a pump occurs when the absolute pressure is less than the vapor p forms small bubbles that collapse when they reach a region of higher pressure in the pump. This results in vibrations that can damage the pump. When two or more pumps are connected in series in a pipeline, the pressure head is increased but the discharge remains the same as with a single pump. The net positive suction head (NPSH) is the total absolute head above the vapor pressure of the fluid at the eye of the impeller. ressure of water. The water vaporizes and 1. There are two primary equations for head (energy) loss to friction in pipeflow, the Darcy-Weisbach and Hazen-Williams equations. They can be written in generic form with the respective coefficients and exponents as follow: 8fL 4.73L n=1.852 cha:2D487 HW The Hazen-Williams coefficient is in US Customary (English) units. Determine the flow, Q, in gpm through a 3200-ft of 6-inch, horizontal wrought iron pipe if the pressure drop is 12 psi. Solve this problem using both head loss equations. Did you get the same answer with both equations? If not, what do you think may be the reason?

Explanation / Answer

1. The first sub-part is a true statement.

2.The second sub-part is a false statement because rigid pipes resist applied loads by bending action in the pipe walls.

3.The third sub-part is a true statement.

4.The fourth sub-part is a true statement.

5.The fifth sub-part is a true statement.

6. The sixth sub-part is a true statement.

7.The seventh sub-part is a true statement.

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