Venturi Meter Experiment Procedures 351hy

Venturi meter experiment Procedures : 1.

Open fully the flow control valve (on the right side of the hydraulic bench).

2.

Open fully the discharge valve.

3.

Switch on the hydraulic bench pump by pressing the black button on the right side of the hydraulic bench.

4.

Let the water flow through the system for a while.

5.

Close the discharge valve. All manometer tubes will show the same water level reading. This is called the total head of the system.

6.

Record the total head of the system in the result sheet.

7.

Adjust the discharge valve to let the water flow through the venturi meter. Set the water level of manometer tube C at approximately 10mm.

8.

Record the water levels of all manometer tubes in the result sheet (Table 2).

9.

Place the PVC tubing into the drain hole. Using the stopwatch, measure and record the time it takes for the water to reach 5 litres. The volume of the water could be seen on the left side of the hydraulic bench. Record the time in Table 2.

10. Once it is done, open the drain and let the water flow into the tank. 11. Close the discharge valve slightly to obtain a different flow rate (increase the water level of manometer tube C by approximately 10mm). 12. Record the water level of the piezometer tubes labeled A and C in Table 3. 13. Place the PVC tubing into the drain hole. Using the stopwatch, measure and record the time it takes for the water to reach 5 litres. Record the time in Table 3. 14. Once it is done, open the drain and let the water flow into the sump tank. 15. Repeat steps (11) to (14) to obtain an additional 5 sets of water level reading (A and C) with different flow rates. 16. Switch off the hydraulic bench pump by pressing the red button on the right side of the hydraulic bench. 17. Close the flow control valve and discharge valve.

PROCEDURE (i) Close all the valves of inlet pipe, venturimeter pipe and manometer tube. (ii) Select the venturimeter pipeline in which the experiment is to be conducted and open the corresponding valve in the line. (iii) Open the inlet valve. (iv) Open the needle valves of manometer and venturimeter tubes. Ensure that the manometer is primed to remove any air bubbles present. (v) Adjust the valve at the exit side of the venturimeter pipe to a desired flow rate. (vi) Note down the readings of manometer and time taken for 10 centimeter rise of water in measuring tank. (vii) Adjust the gate valve for a new flow rate and repeat the experiment. MAINTENANCE

1. After completing the experiment close the inlet valve and open all the gate valves and needle valves to vent any air trapped inside and then close them. 2. Drain the water from measuring tank after completing the experiment.