Attenuation characteristics of the leaky mode guided wave propagating in piping coated with anticorrosion grease. (31st May 2018)

• Record Type: Journal Article
• Authors: Nishino, Hideo; Tateishi, Kohei; Ishikawa, Masashi; Furukawa, Takashi; Goka, Motoki
• Is Part Of: Japanese journal of applied physics. Volume 57:Number 7(2018)Supplement 1
• Publication Date: 2018-05-31
• Subjects: Physics -- Periodicals; 621.05
• DOI: 10.7567/JJAP.57.07LC02
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: Guided wave inspection is expected especially for buried piping because it can be applied easily to such piping requiring only its partial digging from the ground. However, in buried piping, the attenuation coefficient is extremely large compared with that in above-ground piping because the leaky mode guided wave (LTGW) propagates in buried piping and its energy leaks into the adjacent surrounding material as a bulk shear wave. Petrolatum anticorrosion grease (PAG) is the most widely used as the coating material on the pipe surface before burying piping in sand or soil, which is a viscous material with a temperature-dependent shear wave velocity. In this paper, attenuation characteristics of the LTGW are shown theoretically and experimentally. The theoretical calculations explain very well the experimental results measured. The temperature dependence of the attenuation coefficient is discussed with the theoretical outcomes.