API RP 17S:2022 provides recommendations for the sizing, specifcation, system integration, testing and operation of in-line subsea multiphase fow meters (MPFMs) for measurement of full stream, multiphase fow for well testing, allocation measurement, fscal measurement, well management, and in fow assurance applications. This Recommended Practice (RP) includes wet gas fow meters as a subset of MPFMs.