METHOD FOR DETECTING LEAKAGE OF FULL-CAPACITY LNG STORAGE TANK BY ACOUSTIC EMISSION

• Main Authors: OUYANG, Yufeng, HU, Bin, ZHANG, Junjiao, SHEN, Yongna, SHEN, Gongtian, LI, Mengjun
• Format: Patent
• Language: English
• Published: 10.10.2024
• Subjects: BLASTING; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED,LIQUEFIED, OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; HEATING; LIGHTING; MEASURING; MECHANICAL ENGINEERING; PHYSICS; STORING OF DISTRIBUTING GASES OR LIQUIDS; TESTING; TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES; TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR; VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED ORSOLIDIFIED GASES; WEAPONS

Disclosed is a method for detecting leakage of a full-capacity liquefied natural gas (LNG) storage tank by acoustic emission. The method includes: detecting an amplitude of system noise by an acoustic sensor, and determining a signal acquisition threshold; acquiring an amplitude of ambient noise; acquiring an amplitude of the acoustic signal excited by the analog sound source at the distance of 0.1 m from the acoustic sensor and an amplitude of the acoustic signal excited by the analog sound source at the distance of x m from the acoustic sensor, and calculating, an attenuation coefficient of an acoustic signal passing through the outer wall of the storage tank; determining a maximum detection range of the acoustic sensor; and continuously moving the acoustic sensor on the outer wall of the storage tank in a step smaller than the maximum detection range, to perform an LNG leakage detection.