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INPUT   DATA

♥ EXAMPLE Of Input/Output

Title

Pipe internal diameter		inch
Orifice pressure drop		inch-H2O
Liquid density		lb/ft3
Liquid viscosity		cP
Liquid flowrate		ft3/min

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OUTPUT   VARIABLES   &   GRAPHS

Variables	Values	Units
♦  Orifice pressure drop		psi
♦  Liquid mass flowrate		lb/sec.
♦  Orifice Size		inch
♦  Reynold's number

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. For liquid flow, the commonly applied equations are:

where
     d = orifice diameter, inch
     C_D = 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

Tips

    ◊ Use link EXAMPLE Of Input/Output  to demo data entry expectations and results; you may edit & use it as starting point

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.