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.


      Collars D transfer tension forces by closing of slots when the pipeline elongates in tension.
Collars C transfer forces in compression by closing of adjoining slots.  
      Annulus between collars C and the pipeline is sufficient to facilitate continuous bending and control of the ovality of the pipeline.
Collars E are connected to collars B by explosive cladding.
      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.


   Prefabricated BRPJ is added to the pipeline on the installation vessel the same as common pipe joints.
   Locating the BRPJ in the pipeline make up is governed by a long baseline acoustic array identically to terminating a pipeline.
   Accuracy of ±1 meter achievable plus consideration for meandering of the pipeline.
   Moment experienced during the installation induces the bending.
   Final profile if required is achieved by placing weights at locations with the alternative of including a volume of water in the
   sag bend.
   Weights are left in place for hysteresis reasons.








P.O. Box 42484
Houston, TX 77242
Tel 281-531 5220
-Collars C transfer compression forces by closing of adjoining gaps.