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ISO 4064-3:2005  Measurement of water flow in fully charged closed conduits

ISO 4064-3:2005 specifies the test methods and means to be employed in determining the principal characteristics of water meters.

ISO 4064-3:2005 is applicable to cold potable water and hot water concentric and combination meters, which can withstand maximum admissible working pressures equal to at least 1 MPa (10 bar) (0,6 MPa (6 bar) for meters greater than DN 500 and a maximum admissible temperature for cold potable water meters of 30 °C and for hot water meters of up to 180 °C, depending on the class.

ISO 4064-3:2005 also applies to water meters based on electrical or electronic principles and to water meters based on mechanical principles incorporating electrical devices, used to meter the actual volume flow of cold potable water and hot water.