Union-type coupling for marine drilling riser pipe

Details Union-type coupling for marine drilling riser pipe Union-type coupling for marine drilling riser pipe

1982-02-26

1984-12-11

Arola, Dave W.

Pipe joints or couplings

With indicator, alarm or inspection means

285137A, 285354, 285DIG13, F16L 3500

Patent

active

044874340

ABSTRACT:
A coupling for underwater upper and lower riser pipe sections and associated parallel choke and kill line pipe sections, where one riser pipe section is inserted in a second one. One of the riser pipe sections includes a threaded male end which has at least two sets of continuous threads. A female union box carried on the other riser section includes at least two sets of continuous threads interengaged with the sets of threads on the male end, the respective sets of threads being axially and radially spaced from each other, the union box engaging the other riser pipe section for preventing the sections from moving axially relaltive to each other. The sections are provided with a fluid tight seal and choke and kill line sections are also penetratingly joined and supported by the raiser pipe sections.

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