The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 14, 1999
Filed:
Jul. 08, 1997
Yung-sen Chou, Houston, TX (US);
Jeffrey D Otten, Cypress, TX (US);
Sammy R Moore, The Woodlands, TX (US);
Michael E Capesius, Santa Paula, CA (US);
ABB Vetco Gray Inc., Houston, TX (US);
Abstract
A centralizing device is provided for a riser of an offshore well platform having a frame that defines an opening through which the riser passes from the platform to a subsea wellhead. The centralizing device has a centralizing ring with an inner diameter greater than the outer diameter of the riser so that the riser can be passed longitudinally therethrough. The centralizing ring is positioned within the opening of the frame. Adjustable mounting means are used for mounting the centralizing ring to the frame at different positions within the opening. A roller assembly of the centralizing device is carried upon the riser as the riser is lowered through the centralizing ring. The roller assembly is configured to engage the centralizing ring as the riser is lowered through the centralizing ring so that the centralizing ring stops further carriage of the roller assembly by the riser. The roller assembly has rollers mounted thereon that bear against an exterior of the riser to limit lateral movement of the riser but that allow longitudinal movement of the riser when the roller assembly is engaged with the centralizing ring.