China University of Petroleum

South China Company, China Oil & Gas Pipeline Network Corporation

Xi'an Aerospace Yuanzheng Fluid Control Co. Ltd

Guangdong South China Intelligent Pipeline Research Institute

Pipechina South China Company

Shaochuan Lai

Zhongshan Tian

Bo Wang

Chen Zhang

Yuxing Li

Cuiwei Liu

Gang Liu

Changqun Yang

Long Zhong

Zhenning Yang

Jun Yuan

Wen Yang

Wubin Lin

Yulong Feng

A method of leak detection for oil and gas pipeline based on excitation response and system thereof includes: applying an active excitation signal (a pressure pulse directly input by human) or a passive excitation signal (a pressure fluctuation caused by opening and closing valves, etc.) to an oil and gas pipeline with existing leakage points, the excitation signal is reflected at the pipeline boundary and the leakage, and the reflected pressure wave continues to propagate to upstream and downstream, and finally is collected by the dynamic pressure transducer, then the existing leakage of the pipeline is detected and positioned by analyzing the transient response signal and the reflected pressure wave of leakage signal.

Method and system of leak detecting for oil and gas pipeline based on excitation response

A four valve disc frictionless ball valve includes a spherical valve core assembly, wherein the spherical valve core assembly includes a wedge-shaped valve core. A closed-position valve disc is respectively installed on a pair of closed-position wedge-shaped sides. A closed-position guide key is respectively arranged at the middle positions of the pair of closed-position wedge-shaped sides along an axial direction. A closed-position guide groove is arranged on each closed-position valve disc along the axial direction. An open-position valve disc is respectively installed on a pair of open-position wedge-shaped sides. An open-position guide key is respectively arranged at the middle positions of the pair of open-position wedge-shaped sides along the axial direction. An open-position guide groove is arranged on each open-position valve disc along the axial direction.

Four valve disc frictionless ball valve

Growing community of inventors

Guangzhou, China

Shaochuan Lai