Tensioning arrangement for a subsea wellhead assembly
AssigneeAker Kvaerner Subsea AS
InventorRobert Emmerson
Life of this patent
Estimating the term…
Abstract
A pre-tensioning arrangement for inner and outer elongate concentric members (10, 12) comprises a load member (19) which is axially moveable in an actuating direction relative to the inner member (10) and has an outer surface which tapers in said actuating direction, a laterally expansible ring (21) which is engaged by said load member (19) in an inclined engagement zone during the actuating movement, and an engagement zone between the laterally expansible ring (21) and the outer member (12), said engagement zones providing a mechanical advantage between the movement of the load member and movement of the outer member (12).
Claims9
A pre-tensioning arrangement for inner and outer elongate concentric members (10, 12), comprising a load member (19) which is axially moveable in an actuating direction relative to the inner member (10) and has an outer surface which tapers in said actuating direction, a laterally expansible ring (21) which is engaged by said load member (19) in an inclined engagement zone during said actuating movement, and an engagement zone between the laterally expansible ring (21) and the outer member (12), said engagement zones providing a mechanical advantage between the movement of the load member and movement of the outer member (12).
An arrangement according to any foregoing claim wherein the laterally expansible member is disposed in a holder (30, 31) which provides an inclined path of movement for the laterally expansible member whereby outward movement of the laterally member has a component in the said actuating direction.
An arrangement according to any foregoing claim wherein said laterally expansible member carries teeth (24) for engagement in grooves (25) in the outer member (12).
An arrangement according to any foregoing claim wherein the engagement zone between the laterally expansible member (19) and the outer member (12) has a shallow inclination relative to an outward direction of movement of the laterally expansible member.
An arrangement according to any foregoing claim wherein a latch (26) is disposed to hold the load member (19) at an extreme limit of the actuating movement (B).
An arrangement according to any foregoing claim and including a reaction member (10a) between the inner and outer members (10, 12).
Dependencies are inferred from the claim text.