FIELD: machine building.
SUBSTANCE: riser arrangement 40 has multiple tube sections 42 interconnected to make riser column. With assembled riser top and bottom sections retainers 145 make a support for auxiliary tubes of hydraulic control lines. Drive 220 rotate sleeve 170 resting upon riser top tube section to revolve thereon. Said sleeve rotates union nut 160 arranged on said top section to revolve thereat. In rotation, union nut displaces axially along riser tube section to be screw on riser bottom section. Said union nut is tightened to get in contact with outer coupling 136 to complete attachment of top and bottom sections. Then, said process may be repeated for screwing extra top sections to riser column.
EFFECT: lower costs.
25 cl, 9 dwg
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