Draf Text for the NWIP 13628-12- Dynamic production risers ...
3.5 ball joint. ball and socket assembly having a central through-passage equal to or greater than the riser internal diameter that may be positioned in the riser string to reduce local bending stresses. 3.6 barrier. one or several barrier elements which are designed to prevent unintended flow of formation fluid. 3.7 bearing stress ................
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