APPLY OF NDT TECHNIQUES ABOUT BOTTLE PRESSURE VESSEL INSPECTION ON CNG STATION

It′s directly related to the city safety to have the bottle pressure vessel of the compressive natural gas station well-operated. Applying the non-destructive testing for the in-service inspection of the bottle pressure vessel is one way to secure the safety operation of the gas station,and the ultrasonic testing is the best choice. Regarding the confirmation on the sensitivity of the UT,it could be tested by the contrast block made by the operator themselves,simulating the disfigurement via the cut line flute,and further considering about the attenuation. For the circumferential transverse wave testing on the outside surface,the outer-circumferential dual-hole calibration instruments could be used to solve those problems on the calibration of the refraction angle,the fixation of the front distance,and the adjustment of scanning speed etc.