ROSE-HULMAN Institute of Technology

Problem 1

For the system shown in Fig. 1, a Goulds 2 x 3-13 (Fig. 2) with a 12-in rotor is used to pump 250 gpm from the lower to the upper reservoir. The liquid being pumped is water at 175°F

1. Neglecting friction, what restrictions are there on the pump's location?
2. If friction were considered, would it increase or decrease the allowable range of the pump's location? Explain.

Figure 1: Piping system



Figure 2: Goulds pump characteristics (www.goulds.com)

Problem 2

Using data for the 2 x 3-10 pump (Fig.4) at 3,560 rpm

1. Estimate the performance characteristics (H, Q, efficiency, power) of the 10-in. rotor at 1,750 rpm using the manufacturer's information for the 10-in. rotor at 3,560 rpm. Plot the estimate on top of the data as given by the manufacturer.
2. Estimate the performance characteristics of the 6-in. rotor at 3,560 rpm from the 10-in. rotor at 3,560 rpm. Plot the estimate on top of the actual data for the 6-in. rotor at 3,560 rpm.
3. Estimate the performance characteristics of the 6-in. rotor at 1,750 rpm from the 10-in. rotor at 3,560 rpm. Plot the estimate on top of the actual data for the 6-in. rotor at 1,750 rpm.
4. Discuss the implications and limitations of the similarity method of estimating pump performance data.

Figure 4: Goulds pump characteristics (www.goulds.com)