Orifice meter incompressible flow

Section 10 of this Handbook describes the use of orifice meters for flow measurement. In addition, orifices are commonly found within pipelines as flow-restric ting devices, in perforated pipe distributing and return manifolds, and in perforated plates. Incompressible flow through an orifice in a pipehne as shown in Fig. 6-18, is commonly described by the following equation for flow rate Q in terms of pressure drop across the orifice Ap, the orifice area A, the pipe cross-sectional area A, and the density p. 

Example 6.4. An orifice meter is installed in a 4 in. Sch40 pipeline to measure the mass flow rate of butane up to 10000 kg h . Consider that butane is an incompressible fluid with a density of 600 kg m and a viscosity of 0.230 cP. The orifice diameter is exactly half of the pipe diameter ... 

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