Piping Acoustic Induced Vibration (AIV) Fatigue Calculator

Screen relief valve and depressuring flare piping for Acoustic Induced Vibration (AIV) fatigue failure using Carucci-Mueller and EEMUA 158 guidelines.

Pressure Relief & Pipe Geometry

Gas Mass Flow Rate W (kg/hr):

Relief Upstream Press P1 (bara):

Downstream Header Press P2 (bara):

Gas Relieving Temp T1 (K):

Downstream Pipe OD (in):

Pipe Wall Thickness t (in):

Molecular Weight MW (g/mol):

Acoustic Power & Fatigue Screening

Sound Power Level (PWL):

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Carucci Critical Limit (PWL_lim):

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Acoustic Mechanical Power (Watts):

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Pipe D/t Diameter-to-Thickness Ratio:

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AIV Screening Margin:

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Acoustic Fatigue Risk Level:

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Acoustic-Induced Vibration (AIV) in Flare Systems

When high-pressure gas is suddenly discharged through a pressure safety valve (PSV) or emergency depressuring valve (BDV), intense acoustic shock waves and turbulent mixing generate extreme internal sound power levels exceeding $155 - 170\text{ dB}$.

High-Cycle Fatigue at Weldolets & Small-Bore Connections

These high-frequency sound waves ($500 - 2000\text{ Hz}$) excite circumferential flexural ring modes in thin-walled downstream piping. Because frequency is so high, a pipe wall undergoes over $100,000$ stress cycles in just two minutes. Catastrophic through-wall fatigue cracks commonly propagate at branch connections, weldolets, and support trunnions within minutes of a relief event.

Piping Acoustic Induced Vibration (AIV) Fatigue Calculator

Pressure Relief & Pipe Geometry

Acoustic Power & Fatigue Screening

Acoustic-Induced Vibration (AIV) in Flare Systems

High-Cycle Fatigue at Weldolets & Small-Bore Connections

Frequently Asked Questions