SUB-VBR™ Vertebrae Bend Restrictors

Product Overview

SUB-VBR™ Vertebrae Bend Restrictors comprises a number of interlocking elements which articulate when subject to an external load and lock together to form a smooth curved "locking" radius. This radius is chosen to be equal to or greater than the minimum bend radius of the pipe that it is applied to. Once the elements have locked together the bending moment present is transferred into the elements and back through a specially designed steel interface structure into the adjacent rigid connection, therefore protecting the pipe / cable from potentially damaging loads.

Flexible pipes, flowlines, power cables and umbilicals are usually connected to a rigid structure such as a subsea riser base, PLEM or wellhead. To prevent these pipes from overbending at the interface between flexible and rigid structures, Vertebrae Bending Restrictors are often installed on the pipe. The VBR is specifically used where static or quasi-static loads act on a pipe, rather than dynamic loads when a Bending Stiffener would be more suited.

We are able to offer either a bespoke design or make use of a vast array of existing designs of bending restrictor elements to suit a wide range of pipes, umbilicals and cables. We are also able to design and manufacture the steel interface structure required.

Product Images
  • Bend Restrictors
  • Bend Restrictors
  • Bend Restrictors
  • Bend Restrictors
  • Bend Restrictors
  • Bend Restrictors
  • Bend Restrictors
  • Bend Restrictors
  • Bend Restrictors
  • Bend Restrictors
  • Bend Restrictors
  • Bend Restrictors
  • Bend Restrictors
  • Bend Restrictors
  • Bend Restrictors
  • Bend Restrictors
Clients & Track Record
Detail Quantity
SUB-VBR™ Projects Completed Over 60 Worldwide
SUB-VBR™ Clients Over 25
SUB-VBR™ Length Produced Over 1Km
Technical Specifications
Description Specification
ID 45 mm (1.75”) > 310 mm (12”)
OD 140 mm (5.5”) > 840 mm (33”)
MBR Unloaded 225 mm > 8,750 mm
MBR Loaded 155 mm > 7,600 mm
SWL 2 kNm > 250 kNm (2.5 Te)
Proof 4 kNm > 375 kNm (37.5 Te)
ULL 7 kNm > 511 kNm (51.1 Te)
Weight / Kg 11 Kg > 395 Kg
Length 1.5 m > 88 m
Units / M 16 (Small) > 2.5 (Large)
Design Life As Required
Material Subthane™ 801
Fasteners M 5 > M 20 (Metric or Imperial), Carbon Steel, Stainless Steel, Super Suplex, Inconel, Titanium
Design Life As Required
Primary Colour Yellow or White
Features
  • A split design allows installation of the restrictor after pipe termination
  • Ease of installation onshore and offshore
  • Neutrally buoyant in water, eliminating self weight loading on pipe

Let us know your requirements

Subsea Energy Solutions are always available to discuss any requirement you may have.