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Use this spreadsheet to perform orifice plate sizing or performance calculations using the Crane TP 410 Flow of Fluids method. It accommodates Nozzle, Venturi and Square Edge orifice plates for either compressible gases or incompressible fluids under non-critical or choked flow conditions. All the Crane table lookup values are automated and the calculation validity limits are displayed. The resulting flows are presented in a variety of units for convenience. The calculation uses SI metric units.

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Find the liquid flow through circular or semi-circular orifices as well as through perforated screens. Also includes analysis of orifices in series. Calculation is complete with common fluids and pipe table data. Specification sheet is included for easy requisition requests. Includes both English and Metric units of measure

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Find the gas flow through circular orifices as well as through perforated screens. Also includes analysis of orifices in series and one orifice followed by a control valve. Calculation is complete with common fluids and pipe table data. ASME Steam Table integrated into spreadsheet. Specification sheet is included for easy requisition requests. Includes both English and Metric units of measure

The calculation of compressible flow through orifice plates at high pressure drop (critical flow) appears to be carried out incorrectly in most instances. This flow condition is often encountered on gas plants, compressor stations and pipelines where orifice plates are commonly used as a cheap and convenient way to regulate blowdown and pressurising rates. Blowdown must be achieved within the time period required to make the plant safe but at the same time without an excessive rate of pressure drop that could damage equipment. A more accurate calculation method is proposed below and should be used to improve the engineering predictions.