Subsea pipeline solutions by Ocean

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.

Function

-Collars C transfer compression forces by closing adjacent gaps.

-Collars E transfer tension forces when the pipeline elongates in tension.

-Collars C transfer tension forces to collars B or alternatively compression forces to part A.

-Collars D closing the space at field welds, transfer compression forces or alternatively tension forces to collars C.

-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.

Installation
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.