Figure 1 shows a pump and piping system (Discharge Station) that is to drain a 100 m3 tank in (1-5 hours). The tank is used to prepare water, and once this has been done, the pump is to move the liquid to a tank truck (the exit is to atmospheric pressure). The tank itself contains heating coils (not shown) that can be used to warm the fluid prior to pumping it. Based on the following procedures, you can select the appropriate suggested design for the case when Z1=2 m and Z2=4 m.
•
Pipe materials (Wrought iron, Galvanized steel, and PVC).
•
Pipe lengths total (15 m, 20 m, and 25 m).
•
At atmospheric pressure (P1).
•
The pump height from the ground is 0.30 m.
•
Suppose the pump curve (Hp=12-10000Q2).
•
Parallel pumps.
•
Other considerations relevant to piping design can incorporate into your design.
Requirements
1.
Plot NPSHa versus volumetric flow rates?
2.
Plot system and pump curves versus volumetric flow rates and select operating point conditions of your design?
3.
Calculate the standard diameter corresponding to the operating point conditions?
4.
Calculate the time required to discharge liquid corresponding to the operating point conditions?
Student