Experimental Research on DR Detection Technology for LNG Low-Temperature Stainless Steel Pipelines
摘要
To further investigate the effectiveness and application scope of digital radiography (DR) online inspection for liquefied natural gas (LNG) cryogenic pipelines, this experiment fabricated a series of stainless steel pipe specimens with typical defects, covering sizes below DN50 and ranging from DN600 to DN1000. DR inspection tests were conducted under various operating conditions to study the detection of defects and their impact on image quality under different conditions. The test results show that volume-type defects can be detected under all working conditions, while area-type defects can be detected under specific conditions. It can be seen that the application of DR online inspection for LNG cryogenic pipelines is feasible, but the image quality of LNG pipelines with a diameter of DN300 and above does not meet the standard requirements.