Acoustic induced vibration

Regarding acoustic induced vibration (AIV) for piping resulting in shell mode fatigue failure at weld to such as a small bore piping near high energy dispersion location like a control valve, there are many references in the following:

http://www.cstiacoustics.com/vibinduced.php

http://www.equityeng.com/consulting-services/pressure-relieving-systems/acoustically-induced-vibrations

https://pdfs.semanticscholar.org/ec5c/da92fa242b88d8ce745de26780c4db9f246e.pdf

Guidelines for the avoidance of vibration induced fatigue failure in process pipework, Energy Institute

http://www.energypublishing.org/search?mode=results&queries_qname_query=Guidelines+for+the+avoidance+of+vibration+induced+fatigue+failure+in+process+pipework%2C&queries_status_query=new%2Bcurrent%2Bfuture%2Bobsolete&queries_isbn_query%3D=&queries_date_query_fromvalue%5Bd%5D=&queries_date_query_fromvalue%5Bm%5D=&queries_date_query_fromvalue%5By%5D=&queries_date_query_tovalue%5Bd%5D=&queries_date_query_tovalue%5Bm%5D=&queries_date_query_tovalue%5By%5D=&catid=182

The industry standard approach for considering AIV is the screening methodology detailed in Section T2.7 of the Energy Institute document ‘Guidelines for the Avoidance of Vibration Induced Fatigue Failure in Process Pipework’. An assessment of the risks related to AIV can be carried out for all pressure reducing devices (such as pressure relief valves or restriction orifices) on plant pipework such as the relief or blowdown system. This methodology uses an initial prediction of the acoustic noise downstream of a pressure reducing device to identify the pipework which experiences a sound power level greater than a specified limit. Pipework exposed to this level of noise is then analysed further to estimate the ‘Likelihood of Failure’ (LOF) for welded features on the downstream pipework due to fatigue as a result of the acoustic excitation. Mitigation measures can then be considered if required which aim to reduce the LOF to an acceptable level, through tackling the noise at source or by increasing the resilience of the pipework at the design features identified to be a concern.

• Acoustically induced vibration (AIV)

• Acoustic fatigue in pipes

• High frequency acoustic excitation source

• Sound power level (PWL)

• Small bore connection analysis

• Pressure let-down device (Control valve, pressure relief valve, pressure safety valve, orifice, etc)

• As per API 521, Concawe report no, 85/82

• Pipe geometry parameter

• Pipe energy parameter (Mach number)

• Noise calculation as per IEC

• Likelihood of failure assessment

• Acoustic induced vibration control measures

• Fitting type: Weldolet, sweepolet, equal tee, reduced tee, nipolet, latrolet, etc

• Gusset support, reinforced pad, etc

• Energy institute guideline

• Detail FEA assessment

http://www.inertance.com/vibration-in-pipe/acoustic-induced-vibration/