A Bell & Gossett Series e-80 2x2x7B inline pump with a 6 inch impeller operating at 1750

A Bell & Gossett Series e-80 2x2x7B inline pump with a 6½ inch impeller operating at 1750 rpm is being used to transfer water at 60°F between two large tanks as shown in Figure P6.12. All fittings are standard and the globe valve is fully opened.

a. Write and solve a simulation for this system and determine its operating point; head (ft), capacity (gpm), and pump efficiency.

b. Investigate how the operating parameters are affected by the pump speed over the range 1500 ≤ rpm ≤ 3500 in 100 rpm increments. Develop two plots. In the first plot show the head (ft) vs. capacity (gpm). In the second plot, show the efficiency vs. capacity (gpm). For both plots, show the operating points with a symbol. Label several of the symbols with the corresponding pump operating speed (rpm).

Transcribed Image Text:

Water at 60F 12 ft 2-nom sch 40 commercial steel pipe L = 100 ft Globe valve Bell & Gossett Series e-80 2x2x7B Pump 6 inch impeller @ 1750 rpm FIGURE P6.12 A pump and pipe system used to transfer water between two large tanks.