Course:CIVL315/Labs/LAB 1 Pump Station Design

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Safety Considerations

Closed-toed shoes are required in the Hydrotechnical Lab Safety glasses are required in the Hydrotechnical Lab Incorrect use of the apparatus may cause water hammer which has 
the potential to burst the pipes Never leave power connections (e.g. electrical plugs) on the ground in case of flooding


System Setup

Procedure

In case of pump lockdown try turning the control panel off and on 
again. If that does not work, open the control panel with a flathead screwdriver and press the red reset button on the digital controller. If the acoustic flow meter had an E on the display there is an error. Restart the flow meters by unplugging and plugging them back in. If the problem persists consult a technician.


Setting up the equipment

  1. Plug the flow meter power cord into the green extension cord located near the wall. Ensure that the connection is not at ground level in case of flooding.
  2. Check that the reservoir is more than half full of water. Use the water supply on the north wall to fill the reservoir if needed. Make sure that the hose is wound back on the reel after use.
  3. Check that the pump power switches are OFF and turn on the control panel power.
  4. Check that both pump output valves located directly above pump 1 and pump 2 are closed.
  5. Check that the pumps are configured in parallel.

This video demonstrates the steps needed to develop the pump curve, as well as the steps to properly control pump 1. Follow the valve opening and closing procedures precisely to avoid water hammer.

Develop the Pump Curve

Check that the bypass valve is closed as well as the valve leading to the pressure-reducing valve. The distribution valves should also be closed. Configure pump valves to operate with pump 2 only. Open the Pump 2 output valve slowly to avoid water hammer. Open the bypass valve. Vary flow rate by incrementally open distribution valves 0-6 and record the flow rate using the ultrasound flow meters. After collecting all the data, close all distribution valves. Close the Pump 2 output valve. Turn off Pump 2 by turning the power switch on the control panel.


Vary Pump Speed

Configure pump valves to operate with pump 1 only. Ensure the output valve from the variable speed pump is closed and start pump at 0 rpm. Then set speed to 3450 rpm. Open the pump 1 output valve slowly. Open the bypass valve. Set pump 1 speeds 3450, 3200, 2900, 2500, 2000 and 1600 rpm. Vary flow rate by incrementally opening distribution valves: 0-6 for 3450 rpm 0-4 for all other speeds After recording the data, close all distribution valves. Close Pump 1 outlet valve. Set pump 1 rpm to zero and turn off power to pump 1.


Pumps in Parallel

Configure pump valves to operate both pump1 and 2 in parallel. Bypass the pressure-reducing valve. Set pump 1 speeds to 3450, 3200, 2900, 2500, 2000 and 1600 rpm. Vary flow rate by opening 1 to 3 distribution valves. Close all distribution valves. Close pump 2 output valve. Close pump 2 output valve. Sets pump 1 rpm to zero. Then shutdown pump 1 and 2 power with control panel switches.


Pumps in Series

Configure pump valves to operate both pump 1 and 2 in series. Bypass the pressure-reducing valve. Set pump 1 speeds to 3450 and 2900 rpm. Vary flow rate by incrementally opening distribution valves 0-3 for 3450 rpm. 0-2 for 2900 rpm. Close distribution valves. Close bypass valve. Close pump 2 outlet valve then close pump 1 outlet valve. Set pump 1 rpm to zero, then shutdown pump 1 and 2 power with the control panel switches. The following video shows how to regulate pressure by using the pressure reducing valve and the variable frequency drive.

Video 2

Pressure Regulation using PRV

Configure pump valves to operate both pump 1 and 2 in parallel. Set pump 1 to maximum speed. Enable pressure-reducing valve. Regulate distribution pressure (Gauge 3) to 4.5-5.0 psi. Vary flow rate by incrementally opening distribution valves (0-6).

Pressure Regulation using VFD

Bypass the pressure-reducing valve. Vary flow rate by incrementally opening distribution valves (0-6). Regulate distribution pressure (Gauge 3) to 5.0psi by controlling the speed of pump 1. Note: If there is insufficient pressure with pump 1 operating alone, activate pump 2 and operate in parallel with pump 1. Measure the current and voltage drawn by the pump after the distribution valve is open. Repeat until all distribution valves are open. For 5 and 6 open distribution valves, pump 1 alone is not powerful enough to reach the desired pressue. Turn on pump 2 in parallel with pump 1 and reduce the rpm of pump 1 to achieve desired pressure (4.5 PSI).

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