Straight-run and vibration requirements for vortex precession meters?

As a fluid-oscillation meter it is sensitive to flow profile and vibration:

1) Straight runs: ≥10D upstream, ≥5D downstream (D = nominal size); add a flow conditioner after elbows or pressure regulators; 2) Vibration: pipe vibration corrupts the precession signal and causes false flow — keep away from compressors and pumps, add pipe supports or flexible couplings if needed; 3) Avoid two-phase flow: gas-liquid mixtures deviate strongly — keep gas dry or install a separator upstream; 4) Mounting: horizontal preferred, arrow aligned with flow.