Field experience shows how to inspect odd, noninspectable platform risers

Recent field experience has proven the use of new inspection tools on odd (that is, geometrically eccentric) risers.Described here are three successful inspections of odd, small-diameter riser configurations for three different operating companies in Alaska, Chile, and California. These experiences have resulted in an increasing range of equipment for the inspection of such risers from a single access point at the platform. The problemPlatform risers must be in condition not only to ensure smooth and safe operations but also to protect the environment. Checking their condition requires inspection. Although almost all long-distance pipelines, even old lines, are piggable today, many riser...

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