MEC442 Fluid Mechanics II Pump Selection Assignment 2, 2025 | UiTM

MEC442 Assignment

Your company has been assigned to evaluate two pumps, Pump A and Pump B, to be used in the piping system for transferring water from one large reservoir to another large reservoir that is at a higher elevation, as shown in Figure 1. The free surfaces of both reservoirs are exposed to atmospheric pressure.

The piping system specifications for the various parameters are provided in Table 1. Kindly use the data for H required or the system curve

Figure 1: Water pump with piping system

Table 1: Dimensions and minor loss coefficients for the piping system

The performance curve (manufacturer data) for Pump A is given by an equation, while Pump B is given in tabulated form. Kindly use the data for H available for both pump A and pump B to be installed in the same piping system in Figure 1 and Table 1.

General Pump Performance Curve

Using Microsoft Excel:

1. For Pump A

The pump performance curve (manufacturer data) is approximated by the expression:

Havailable = H0 – aQ2
H0 = 24.4
a = 0.0678 m/Lpm2
By varying Q from 0 Lpm to 20 Lpm, plot the Hrequired and Havailable on a clearly labelled graph and determine the operating head and flow rate.

[20 Marks]

2. For Pump B

The impeller has a uniform blade height of 50 mm, with the impeller inlet of 40 mm and outlet radius of 80 mm, respectively. The exit blade angle is 15°, and the tangential velocity component of the water entering the blade is zero. Assuming ideal flow conditions, fill in the pump performance curve (manufacturer data) as shown in Table 2 below.

Plot the Hrequired and Havailable versus Q from 0 Lpm to 30 Lpm. Clearly label the graph and indicate the operating point. State the equation represented by the curve.

Table 2: Pump B performance data

[20 Marks]

3. Evaluate the sum of Head and Volume Flow Rate, Q, if Pump A and B are connected in

a) Series

b) Parallel

[10 Marks]

Show all work, calculations, and tabulated data.

[Note: Assume density of water is 1000 kg/m3 and viscosity is 1.002 × 10-3 kg/m⋅s]