US 11,986,773 B2
Membrane defect inspection method and membrane defect inspection device
Keishi Watanabe, Amagasaki (JP); Shintaro Nishimoto, Amagasaki (JP); Tetsuya Uenaka, Amagasaki (JP); Fang Zhao, Amagasaki (JP); and Akira Matsunaga, Amagasaki (JP)
Assigned to KUBOTA CORPORATION, Osaka (JP)
Appl. No. 17/296,367
Filed by KUBOTA CORPORATION, Osaka (JP)
PCT Filed Dec. 3, 2019, PCT No. PCT/JP2019/047119
§ 371(c)(1), (2) Date May 24, 2021,
PCT Pub. No. WO2020/121880, PCT Pub. Date Jun. 18, 2020.
Claims priority of application No. 2018-232095 (JP), filed on Dec. 12, 2018.
Prior Publication US 2022/0023802 A1, Jan. 27, 2022
Int. Cl. B01D 65/10 (2006.01); G01M 3/24 (2006.01)
CPC B01D 65/104 (2013.01) [G01M 3/24 (2013.01); B01D 65/102 (2013.01); B01D 2313/60 (2022.08); B01D 2313/70 (2022.08); B01D 2313/903 (2022.08); G01M 3/243 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A membrane defect inspection method for a membrane module set comprising a plurality of membrane modules connected in parallel under a straight pipe portion of gas detection piping extending in a horizontal direction, the straight pipe portion communicating with raw water inlets in the plurality of membrane modules or treated water outlets in the plurality of membrane modules, the method comprising:
a gas injection process where gas bubbles leaking from a defect part of a membrane of the membrane module set hit against the straight pipe portion of the gas detection piping while the gas detection piping is filled with water; and
a vibration detection process where a vibration sensor is brought into contact with a surface of a protrusion, the surface not being in contact with the water, to detect vibration of the gas detection piping through the protrusion, the vibration being caused by the hitting of the gas bubbles against the straight pipe portion of the gas detection piping, the protrusion protruding outward in a radial direction from an outer surface of the gas detection piping.