Smoldering pipeline pig. Iron sulfides on the pig are reacting to the oxygen in the air, causing an exothermic reaction.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...g_fullsize.jpg
Previously:
Giant pipeline smart pig - photo
Pipe scrub nozzle - GIF
Culvert jet for pipe cleaning - video
Pipe flange spreading tool - GIF
Track torch for cutting pipe - GIF
HDPE pipe fusion machine - photo and video
Wood stave pipeline - photo
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