IS 4477 : Part 2 : 1975 Methods of measurement of fluid flow by means of venturi meters: Part 2 Compressible fluids

1 SCOPE

1.1 This standard (Part II) specifies the profile, sizes and material of construction of venturi meters and venturi nozzles and outlines the procedure for the measurement of flow of gases under steady conditions up to a Mach number of 0·5 at the throat.

1.2 Details of connections between primary and secondary elements are proposed to be covered in a separate standard.

1.3 This standard does not cover the measurement of steam, wet ga'5es or mixtures.

1.4 This standard also provides the data on discharge coefficients applicable to the following conditions for use in computing the rate of flow through these devices of specified profile when direct calibrations have not been made on them, and provides an example for computation offlow (see Appendix A):