ESDU 66030 gives approximate pressure loss information for a wide range of flowmeters operating under turbulent flow conditions. The data are based on information supplied by manufacturers of flowmeters and on the British Standard@ B.S.1042@ Part 1@ 1964 on flow measurement. The information is presented in non-dimensional terms. Flowmeters are grouped into types according to operating principles and illustrated schematically in a table which acts as an index to the pressure loss data. Also indicated are typical applications of each type but flow metering performance is not considered.