ECDA——the west-to-east natural gas transmission pipeline (Henan to Hubei part)
ECDA——the west-to-east natural gas transmission pipeline (Lanzhou to Yinchuan part)
ECDA——the second west-to-east natural gas transmission pipeline (Gansu to Shaanxi part) 
Long distance ultrasonic guide wave——Inspect and evaluate Buried pipeline
Long distance ultrasonic guide wave——Inspect and evaluate Buried and crossing pipeline
C-Scan technique——Inspect the in-service pipelines’
Magnetic stress technique——Inspect and evaluate pipeline in processing station
Magnetic stress technique——Inspect and evaluate oil transmission pipeline 
Inspect and evaluate the High-Temperature Furnace Tubes in petrochemical plants
