non-destructive testing of welded joints of the du 200 pipeline at the construction of an oil refinery. specialist indicates weld

200 connection construction control corrosion detection diagnostics examination flange flaw gamma gas gasoline indicates industry inspection iron joint joints metal nondestructive oil people person pipe pipeline pipelines production pumping radiation radiology refinery refining repair science sewage specialist structure structures tap technology testing transport weld welded welder welding white xray