Closure For An Equipment Sub

A closure apparatus, comprising:

• a sub body having an annular opening and including a wedge shaped recess;
• a closure door carried by the sub body and movable thereto between an open position and a closed position;
• a plurality of arcuate segments, each arcuate segment including a wedge shaped projection engaging the wedge shaped recess in the closed position;
• a plurality of cross bars, each cross bar carrying one of the arcuate segments,
• a plurality of retainers mounted to the closure door retaining the cross bars to the closure door such that the cross bars and the arcuate segments float axially relative to the door;
• wherein during movement from the open position to the closed position, the wedge shaped projection of each arcuate segment self adjusts and self locates as it coacts with the wedge shape recess due to the cross bar floating axially.

A closure apparatus, comprising:

• a sub body having an annular opening with a sealing surface defined about a central axis;
• a closure door carried by the sub body and movable thereto between an open position and a closed position;
• a first hinge mounted to the closure door;
• a second hinge mounted to the sub body;
• a swing arm connecting the first and second hinges;
• a first adjustment mechanism on the first hinge, the first hinge being radially spaced from the central axis, wherein the adjustment mechanism is adjustable to adjust planarity between closure door and the sub body.

The closure apparatus of claim 16, further comprising:

• a third hinge mounted to the closure door, the third hinge aligned along the first hinge axis to work in cooperation with the first hinge;
• a fourth hinge mounted to the sub body, the fourth hinge aligned along the second hinge axis to work in cooperation with the second hinge, the first and second hinges being above the central axis and the third and fourth hinges being below the central axis;
• a second swing arm connecting the third and fourth hinges;
• a column connecting the swing arms;
• a third adjustment mechanism on the fourth hinge comprising a third pair of set screws, wherein the third adjustment mechanism is adjustable to adjust concentricity between the closure door and the sub body in cooperation with the second adjustment mechanism.

A closure apparatus, comprising:

• a sub body having an annular opening and including a wedge shaped recess and a conical sealing surface proximate the wedge shaped recess, the sub body being a metal forging and having annular wall body region and a neck region, the neck region providing a welding surface for welding to a pressure vessel;
• a closure door carried by the sub body and movable thereto between an open position and a closed position;
• a plurality of arcuate segments, each arcuate segment including a wedge shaped projection engaging the wedge shaped recess in the closed position;
• and
• wherein the annular wall body region has an annular portion surrounding the sealing surface that becomes thicker in cross section as the sealing surface and annular body region extend toward the neck region.

A closure apparatus, comprising:

• a sub body having an annular opening and including a wedge shaped recess;
• a closure door carried by the sub body and movable thereto between an open position and a closed position;
• a plurality of arcuate segments, each arcuate segment including a wedge shaped projection engaging the wedge shaped recess in the closed position;
• a plurality of cross bars, each cross bar having a first end acted upon by drive hub and a second end acting upon one of the arcuate segments;
• a crank operable to drive the drive hub about the drive axis;
• and
• a lock member removably mounted to the closure door, the pressure lock member engaging the crank and one of the cross bars preventing movement of the crank and the cross bars when mounted to the closure door.

A closure apparatus, comprising:

• a sub body having an annular opening and including a wedge shaped recess;
• a closure door carried by the sub body and movable thereto between an open position and a closed position;
• a hinge assembly between the closure door and the sub body to provide for a swinging movement of the closure door between the open and closed positions;
• a plurality of arcuate segments, each arcuate segment including a wedge shaped projection engaging the wedge shaped recess in the closed position;
• a plurality of cross bars, each cross bar having a first end acted upon by drive hub and a second end acting upon one of the arcuate segments;
• a crank operable to drive the drive hub about the drive axis;
• and
• a pry bar receivable into a first coupler on the hinge assembly for facilitating manually operated swinging movement of the closure door.