Identification of pipes damages on gas compressor stations by modal analysis methods

During their operation the pipes of gas compressor stations are influenced by dynamic impacts caused by operating equipments as well as flowing media. Due to the occurrence of excessive vibrations on output pipes of turbocompressor after its modernization, experimental vibration analysis of the output pipe of turbocompressors was realized, which included modal analysis and vibration measurements during operating of turbocompressor. Objects of measurements were two compressors of the same type. One of them has been an origin and the second was after modernization. In the paper there is described the methodology of eigenfrequencies measurement of pipes and measurement of their vibration velocities during operation of compressors. The aims of the measurements were to determinate a source of an excessive vibration and proposal of measures leading to reducing vibration to an acceptable level defined by a relevant standard.