Tensioner latch with pivoting segmented base

A method for tensioning a riser, the method comprising the steps of:

• (a) connecting an upper latch member to a tension joint, the tension joint being a segment of a riser assembly and connecting an annular centralizer to an outer diameter of the riser assembly;
• (b) providing a lower latch assembly, the lower latch assembly comprising a plurality of latch segments positioned around the circumference of a bore of a drilling platform, each of the segments being pivotable from an open position to an engaged position, the open position defining an inner diameter greater than an outer diameter of the centralizer and the engaged position forming an annular latch ring having an inner diameter less than the outer diameter of the upper latch member;
• (c) passing the centralizer downward through the inner diameter of the lower latch assembly, then tensioning the riser assembly by drawing the tension joint upward relative to the lower latch assembly;
• (d) moving the plurality of latch segments from the open position to the engaged position, and supporting each of the latch segments with two adjacent latch segments;
• and
• (e) lowering the tension joint onto the lower latch assembly until the upper latch member lands on the lower latch ring.

An apparatus for providing tension to a riser, the apparatus comprising:

• a platform having a bore therethrough;
• a tubular member extending through the bore;
• an annular centralizer and an annular upper latch member each connected to an outer diameter of the tubular member, the centralizer being axially below the upper latch member, the upper latch member having an end surface;
• and
• a plurality of latch segments positioned circumferentially around the bore, each of the plurality of latch segments each having a pivot end pivotally connected to the platform and an engagement end, each of the plurality of latch segments being moveable between an open position and an engaged position, the engagement end of each of the latch segments being nearer an axis of the bore than in the open position to define an annular latch ring having an inner diameter smaller than the outer diameter of the upper latch member, each of the plurality of latch segments contacting two adjacent latch segments in the engaged position, so as to restrain inward and downward movement of the each of the plurality of latch segments.