The chart shows the pump performance curves for Iwakis MD series of magnetic drive centrifugal pumps when operated at a supply frequency of 50 Hz. The labels (6Z, 6 and 10) next to the curve are the pump models.

1. Your process requires you to pump 5 L/min of water at 20 C through a vertical height of just over 2 m. Which Iwaki pump or pumps (Model 6Z, 6 or 10) would you select for this process and how would you arrange the pump(s) to achieve this capacity and head for your process? Explain your answer.

2. Your process requires you to pump 5 L/min of water at 20 C through a vertical height of 1.5 m. Which Iwaki pump or pumps (Model 6Z, 6 or 10) would you select for this process and how would you arrange the pump(s) to achieve this capacity and head for your process? Explain your answer.

3. What is the capacity when a Model 6Z and a Model 6 Iwaki pumps are arranged in parallel to overcome a system resistance of (i) 1.5 m; (ii) 0.5 m?

4. A process has no static head and water at 20 C is pumped at a flowrate of 3 Lmin-1 by a single Iwaki model 6 pump. Determine the operating point when the Iwaki model 6 pump is replaced by a single Iwaki model 10 pump.

5. If a 2 cm diameter smooth pipe is used to transport the water in part (d), what is the length of this pipe?

50Hz 3 2 6Z Head (m) 1 10 6 0 2 4 6 8 10 12 14 Capacity (L/min) 50Hz 3 2 6Z Head (m) 1 10 6 0 2 4 6 8 10 12 14 Capacity (L/min)