A fairing for riser pipe immersed in a fluid medium, usually fresh water or sea water. The fairing is constructed of syntatic foam and is compatible with existing systems. The fairing may be removably secured to riser buoyancy modules. The fairing has special fluid flow characteristics.

Riser pipe fairing

Sensors, including fiber optic sensors and their umbilicals, are mounted on support structures designed to be retro-fitted to in-place structures, including subsea structures. The sensor support structures are designed to monitor structure conditions, including strain, temperature, and in the instance of pipelines, the existence of production slugs. Moreover the support structures are designed for installation in harsh environments, such as deep water conditions using remotely operated vehicles.

Apparatus and method for retroactively installing sensors on marine elements

A vortex induced vibration suppressor and method is disclosed. The apparatus includes a body that is a flexible member of a polymeric (e.g., polyurethane) construction. A plurality of helical vanes on the body extend longitudinally along and helically about the body. Each vane has one or more openings extending transversely there through. A longitudinal slot enables the body to be spread apart for placing the body upon a riser, pipe or pipeline. Tensile members that encircle the body and pass through the vane openings enable the body to be secured to the pipe, pipeline or riser.

Vortex induced vibration suppression device and method

A non-rotatable fairing for suppression of vortex-induced vibration of a marine tubular is provided, the tubular having a circular cross section and a centerline that is normal to the circular cross section, the fairing comprising: shaped sides that extend essentially tangentially from the outer surface of the tubular toward a point that is about a distance equal to the outside diameter of the tubular or less from the centerline of the tubular; and a means to fix the fairing to the tubular so that the fairing cannot rotate around the tubular, wherein the maximum length of the cross section of the combined fairing and tubular is between about 1.25 and about 1.5 times the outside diameter of the tubular.

Small fixed teardrop fairings for vortex induced vibration suppression

The present invention is a method for deploying a drilling riser VIV suppression system in which a first retaining ring is installed on a syntactic foam buoyancy module encircling the drilling riser with a spring loaded connection. The spring loaded connection is capable of adjusting the diameter of the retaining ring automatically to compensate for compression of the syntactic foam under the influence of water pressure. VIV suppression provisions is then installed about the drilling riser using the first retaining ring as a load shoulder.

Vortex induced vibration protection for deepwater drilling risers

A fairing for elongated elements is disclosed for reducing current-induced stresses on the elongated element. The fairing is made as a stream-lined shaped body that has a nose portion in which the elongated element is accommodated and a tail portion. The body has a bearing connected to it to provide bearing engagement with the elongated element. A biasing device interconnected with the the bearing accommodates variations in the outer surface of the elongated element to maintain the fairing's longitudinal axis substantially parallel to the longitudinal axis of the elongated element as the fairing rotates around the elongated element. The fairing is particularly adapted for mounting on a marine drilling riser having flotation modules.

Fairing for elongated elements

Fairing for elongate member

L'INVENTION CONCERNE UN CARENAGE DESTINE NOTAMMENT A UNE COLONNE DE FORAGE EN MER. LE CARENAGE 20 COMPREND UN NEZ 21 DESTINE A ETRE PLACE AUTOUR D'UNE SECTION DE COLONNE, ET UN EMPENNAGE 22 QUI PART VERS L'ARRIERE DU NEZ 21. UN PATIN 39 D'APPUI EST DESTINE A S'APPLIQUER CONTRE LA SURFACE EXTERIEURE DE LA SECTION DE COLONNE OU D'UN MODULE DE FLOTTAISON, MONTE SUR CETTE COLONNE, ET A SUIVRE LES IRREGULARITES DE LA SURFACE EXTERIEURE DE LA COLONNE SOUS L'ACTION D'UN ENSEMBLE A RESSORT 30. D'AUTRES PATINS 28 D'APPUI, PLACES SUR LA SURFACE INTERIEURE DU NEZ 21, SONT EGALEMENT MAINTENUS EN CONTACT AVEC LA SURFACE EXTERIEURE DE LA COLONNE AFIN DE PERMETTRE AU CARENAGE 20 DE TOURNER AISEMENT AUTOUR DE CETTE DERNIERE LORSQUE LES COURANTS AUXQUELS IL EST SOUMIS CHANGENT DE DIRECTION. DOMAINE D'APPLICATION : PROTECTION DES COLONNES DE FORAGE EN MER.

Ortloff John Ernest

Papers

Fairing for elongated elements

Fairing for elongate member

Carenage pour elements allonges et section de colonne equipee de ce carenage