Master Flow Induced Vibrations for Piping Systems

A: A would cause pitting near the trim and pressure recovery effects rather than uniform downstream vibration. B explains noise but not the rapid fatigue cracking at supports. C fits intermittent damage patterns and liquid hammer marks, not steady broadband excitation. D aligns with continuous excitation, coating wear, and early support weld cracking under high-velocity gas service.

A: A would be overly restrictive for clean gas and would halt many compliant designs. B borrows liquid heuristics and ignores the much lower gas density. C underestimates dynamic pressure effects at elevated pressure gas systems. D matches order-of-magnitude screening used to flag potential FIV in pressurized gas piping.

A: A would leave dynamic loading unexamined and fail an audit trail. B narrows the issue to wall loss and ignores fatigue and support loading. C checks static stress and thermal cases but misses vibration-driven damage. D aligns with industry practice separating erosional limits from vibration risk screening.

A: A would manifest across the system and correlate with temperature changes. B causes mechanical damage signatures and sporadic events rather than continuous buzzing. C shows discrete frequencies tied to rotating equipment speeds. D explains selective failure of small-bore connections under high-frequency excitation.