Vibrating Piping and Line Movement Surveillance

Operating personnel should report vibrating or swaying piping to engineering or inspection personnel for assessment. Other significant line movements should be reported that may have resulted from liquid hammer, liquid slugging in vapor lines, or abnormal thermal expansion. At junctions where vibrating piping systems are restrained, periodic magneticparticle testing or liquid-penetrant testing should be considered to check for the onset of fatigue cracking. Branch connections should receive special attention.