The Propagation of Acoustic Emission Across CNG Cylinder

by Tonphong Kaewkongka, Jirapong Lim, Suparerk Sirivedin, Chatchapol Chungchoo

Publisher - Chulalongkorn University,King Mongkut’s University of Technology North Bangkok, Iron and Steel Institute of Thailand, Thailand

Category - General Novel

Defects on compressed natural gas (CNG) storage cylinders can often result in damage of costly cylinders. Acoustic emission (AE) testing was performed on type I steel cylinder. These studies suggested that the elastic stress waves or acoustic emissions generated during the microscopic dislocation can propagate across the storage cylinder surface to be detectable by the sensors attached at the ends of the cylinder. This paper presents a preliminary study on the signal transmission and propagation of acoustic emission (AE) signatures across the cylinder. During the test, a gradual increase in hydrostatic pressure up to 300 bars was applied to the cylinder. The AE signals were recorded as a function of time and the increased pressure. It is therefore obvious that AE can be used to capture the microscopic failure due to its grain dislocation or flaws initiation in the cylinder.

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