Bending Restrictor Pipe Joint - BRPJ
BRPJ is included in the pipeline assembly during the S and J Lay installation methods and are used for the purpose of controlling the strain level and the ovality during cold bending in conformance with project and industry standards.
Adjoining pipe sections with increased wall thickness are included to ensure that bending occurs at the BRPJ. The lengths are determined by the installation moment and placement accuracy.



-Interface between collars B & D is clad and formed to a collar section.
-Half shell collars E secured with heat shrink collar transfer tension forces by closing of slots when the pipeline elongates in tension.  
-Collars C transfer compression forces by closing of adjoining gaps.
-Annulus between collars C and the pipeline is sufficient to facilitate continuous bending and control of the ovality of the pipeline.
-The section modulus of the collars are added to the pipeline when the slots and gaps close resulting in discontinued yielding.
-Components shown in green are of pipeline grade and red of high strength material.
-All components are corrosion coated with thermal spray aluminum (TSA).
-Length of pipe section subjected to bending depends on the selected bend angle and strain level.
Locating the BRPJ in the assembly is identical to terminating pipelines by adding the distance between point A and the place of bending.

Prefabricated BRPJ are added to the pipeline on the installation vessel identically to common pipe joints.
Final profile if required is achieved by placing weights at required locations with the alternative of including a volume of water in the sag bend. Weights can be left in place for hysteresis reasons.


P.O. Box 42484
Houston, TX 77242
Tel 281-531 5220