The use of flexible pipe in offshore oil and gas situations is usually grouped into two categories: static and dynamic.
Flexible pipe and umbilicals in these environments require buoyancy modules to reduce topside or tension lads or to achieve a particular configuration as illustrated here.
BOE’s distributed buoyancy system normally consists of two parts; the buoyancy and clamping system. The buoyancy elements are supplied as two halves with a recess designed to accept the clamp.
Design, engineering, materials
The densities and composition of distributed buoyancy modules are based on operational parameters such as hydrostatic pressure,uplift, water ingress, riser diameter, etc.
In most cases the main elements of the modules comprise micro and macrospheres encapsulated in a polymer syntactic foam matrix. In higher temperature environments the buoyancy modules incorporate convection channels.
Technical information
Attachment methods The buoyancy elements are fastened around the clamp and flowline using two sets of Kevlar securing straps which fit into moulded-in recesses on the body of the modules.
Bolted and other attachment methods are also offered.
External finishing Our distributed buoyancy modules are finished in rotationally moulded polyethylene, polyurethane elastomer or glassfibre which provide the following benefits: • Abrasion and impact resistance
• Enhanced water ingress performance
• Marine growth resistance
• High-vis pigmentation
• Optional customised graphics
