CENTRIFUGAL PUMP LAB Part 1. Characteristics of a Single Pump (N = 2800 rpm)

Measurements Analysed Data Discharge Torque Pressure Discharge Head Power In Power Out Efficiency Q (L min–1) T (mN m) p (kPa) Q (m3 s–1) H (m) I (W) Pout (W) (%) Graphs Graph 1.1: H vs Q Graph 1.2: I vs Q Graph 1.3: vs Q Q should be on the horizontal axis in L min–1 (the numbers would be too small in m3 s–1). H (in m), I (in W) and (as %) should be on the vertical axes. Specific-Speed Calculation At maximum efficiency point: Q ______ m3 s–1 H ______ m Ns ______ rpm

Part 2. Characteristics of a Single Pump (N = 1400 rpm)

Measurements Analysed Data Discharge Torque Pressure Discharge Head Power In Power Out Efficiency Q (L min–1) T (mN m) p (kPa) Q (m3 s–1) H (m) I (W) Pout (W) (%) Hydraulic Scaling

3

1

2

1

2

2

1

2

1

2

1

2

1

2 ,,

=

==

N

N

I

I

N

N

H

H

N

N

Q

Q, 12 =

Here, N1 = 2800 rpm, N2 = 1400 rpm.

Graphs Graph 2.1: H vs Q Graph 2.2: I vs Q Graph 2.3: vs Q Units as for Part 1. On each graph include both your measurements at 1400 rpm and data scaled from 2800 rpm to 1400 rpm.

Data scaled from Part 1. Discharge Head Power In Efficiency Q (L min–1) H (m) I (W) (%)

Part 3. Pumps in Series

Measurements Analysed Data Discharge Pressure Head Q (L min–1) p (kPa) H (m)

Deduced from Characteristics of a Single Pump (in Part 1) Same Q H = 2H1

Graphs Graph 3.1: H vs Q Units as for Part 1. On the same graph include your measurements for the two-pump system and values deduced from Part 1.

Discharge Head Q (L min–1) H (m)