Sizing Of Orifice For Liquid Flow

[Freeman]

Sizing Of Orifice For Liquid Flow


The orifice meter is a device for measuring the rate of flow of liquid and gas through a pipe. Typically, it consists of a flat circular plate which has a circular sharp-edged hole called orifice, which is concentric with the pipe. In chemical process design, an orifice is usually sized for known flowrate and presure drop.

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For liquid flow, the commonly applied equations are:

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where

d = orifice diameter, inch
CD = maximum allowable vapor velocity ≈ 0.62
D = pipe inner diameter, inch
Δp = pressure differential, psia
W = full-scale upstream mass flow rate, lb/s
ρ= upstream liquid density, lb/ft3

BIBLIOGRAPHY

• Coker, AK; Fortran Programs For Chemical Process Design, Analysis & Simulation; Gulf Publ. Co, Houston, 1995.
• Chopey, NP; Handbook of Chemical Engineering Calculations; McGraw Hill, New York, 2003.

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