While there is no brand-new 2024 or 2025 edition of the ASME PTC 6

Previously, the code required a custom-built ASME nozzle. The new edition now permits the use of multi-path ultrasonic flow meters, provided they meet a rigorous in-situ calibration protocol. This saves weeks of fabrication time.

Why the "New" Version Matters

1. The Current Landscape: ASME PTC 6-2004 (and its legacy)

Alternative Test

: Relies on fewer measurements and makes greater use of correction curves, offering cost savings while maintaining acceptable (though slightly higher) uncertainty.