Thanks for your help, It was totally Pitting on the Threads, and on the Nose of the connection fro VX39 type of connections. very good point, that Pitting can not occur while using the pipe.
Much appreciated
my Question again
Recently, we've had a lot of 4” drill pipe rejected as unserviceable during routine inspections due to pitting on the VX39 threads connection. Not sure about the drilling mud chemistry if it’s Oil / Water based. We haven't observed any H2S (not that we know of anyway). I’m...
4" DP looks like they need ~25k EUR in repairs. As rough assumption, it is believed that some Pitting corrosion is involved – your expertise and advice would be highly appreciated. If this prove to be the case, do you recommend to use some corrosion rings in the future (for similar mud system)...
