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Orifice and venturi pipe flow meter are described and calculations for liquid flow and gas flow are shown with examples. ISO 5167 equations for the orifice coefficient and for calculating pipe flow rate with gas flow or with liquid flow are presented and used in example calculations. There is a description of pressure differential flow meters in general and how they are used to measure pipe flow rate. Flow nozzle meters are also described and discussed along with example calculations. Excel spreadsheet screenshots are included showing spreadsheet solutions to example problems.