Offshore pipeline repair
Reinforcekit 4D-S


Damaged pipe reinforcement & composite repair for subsea application

REINFORCEKiT® 4D SUBSEA (R4D-S) is an advanced permanent composite repair system for subsea pipes.

The original 3X ENGINEERING concept is an association of Kevlar® tape and specific bi-component epoxy resin that polymerizes underwater.

R4D-S is a wet lay-up system wrapped helicoidally by external application around the pipe in order to bring the mechanical resistance to the damaged pipe section. 

In accordance with ASME B31G, ASME B31.1, ASME B31.3, ASME B31.4, ASME B31.8, ISO 24.817, ASME PCC-2, DNV-RP-F101, DNV-RP-D101 & DNV-OS-F101 standards, this patented product is recommended to repair and reinforce pipes operating between +10°C up to +50°C (+50°F to +122°F), suffering from internal or external corrosion defects and mechanical damages in subsea environment.

We have developed our own software called Reinforcekit Engineering Analysis (R.E.A) to design the composite repair and define the material requirements in accordance with existing international standards. For subsea operations, we provide our technical team to manage your divers and ensure the respect of the implementation.

This subsea composite wrapping technique is a very cost effective solution because each underwater repair requires less time than any other techniques. Moreover, it can easily be applied by trained divers.

Offshore pipeline repair


  • Reinforce subsea pipe damaged by internal & external corrosion
  • Prevent subsea pipe from further corrosion/deterioration
  • Repair subsea pipe with leakage, dent ...


  • Subsea environment 
  • All subsea pipe geometries (tee, elbow, oval pipe ...)
  • All subsea pipe diameters (no limitations)
  • High subsea pipe pressure


  • Online repair (no shutdown required except if leakage)
  • No heating or post-curing required
  • No pressure limitation
  • No overload on corroded subsea pipe
  • Fiber not hazardous for users

R4D-S® Main Characteristics

Pipe diameter No limitation
Pipe temperature +5°C / +50°C (+41°F / +122°F)
Application temperature +10°C / +50°C (+50°F / +122°F)
Fiber Kevlar®
Resin R3X1050S + P3X32 Primer

R4D-S® Implementation Steps

Surface preparation (sandblasting)
Filler application
Primer application
Kevlar® tape impregnation with resin
R4D®-S wrapping
over the pipe

R4D-S® Special Tool: BOBiWRAP

Composite wrapping machine for subsea application

BOBiWRAP® is an advanced machine designed to wrap composite materials over damaged or corroded subsea pipelines. It ensures a regular overlap and tension of the tape during wrapping.
After more than 24 months going through conception, development and manufacture, the first tests have been performed in the Port of Monaco in November 2012. The efficiency of the machine co-patented by TOTAL and 3X ENGINEERING was demonstrated.
Underwater, trained divers can now proceed with the repair by dividing by 3 the operating working time compared to traditional wrapping solution.

How does the BOBiWRAP work?

Which are the benefits?

  • Fast subsea installation & easy wrapping
  • Perfect tension & overlap of the tape during wrapping
  • Diver friendly : easy handling, the machine can be controlled by only 2 divers

Which are the main characteristics?

BOBiWRAP Technical Characteristics*
Dimensions Length: 2050 mm
Width: 880 mm
Height: 850 mm
Weight (in air) About 250 Kg
Repair capacity Minimum length: 100 mm
Maximum length: 1000 mm
Minimum diameter: 8"
Maximum diameter: 12"
Material Stainless steel, aluminium, bronze
*Technical characteristics of the model currently available. Can be adapted to suit others diameters on request

R4D-S® Prepreg Tool: BOBiPREG

The BOBiPREG® is a prepreg system designed by 3X ENGINEERING to perform a quick impregnation of the Kevlar® tape with the resin. This device is very useful during the implementation of R4D-S®, for which the tape has to be impregnated before immersion.

How does the BOBiPREG work?

Which are the benefits?

  • Regular impregnation resin/fiber
  • Time saving during installation

Follow us on twitter Visit our facebook page
Visit our channel
        on youtube Visit our Google+ page
9, avenue Albert 2 - 98 000 MONACO - Phone : + 377 92 05 79 81 - Fax : + 377 92 05 72 71 - E-mail :