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  1. MMR Advisor

    Rejection criteria for lamination/inclusions/banding in structural steel plate

    I'm looking for a reference for standards-based acceptance/rejection criteria of microstructure of low alloy structural steel plate. Background - during welding of structure, +45mm plate cracked at midline under thermal stress. Root mechanism determined to be mid-line lamination & non-metallic...
  2. MMR Advisor

    drill pipe - pitting on threads

    I work for a land-based drilling company. Recently, we've had a lot of drill pipe rejected as unservicable during routine inspections due to pitting on the threads. Our drilling mud chemistry is usually oil based, with a ph of about 9-10. We haven't observed any H2S (not that we know of...
  3. MMR Advisor

    Drill Pipe Thread Pitting

    I work for a land-based drilling company. Recently, we've had a lot of drill pipe rejected as unservicable during routine inspections due to pitting on the threads. Our drilling mud chemistry is usually oil (diesel) based, with barrite and caustic added, to a ph of about 9-10. We haven't...

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