Orificemeter

In orificemeter, an orifice plate is placed in the pipe line, as shown in Figure 18.7. If d1 and d2 are the diameters of the pipe line and the orifice opening, then the flow rate can be obtained as:

Figure 18.7 Orificemeter

Volume of flow,

where C_d is known as coefficient of discharge; its value ranges from 0.6 to 0.7.