impact testingbending test

Subsea Cable Protection Products

The Blue Ocean Projects (BOP) range of Cable Protection Products is designed to provide protection for subsea cables at offshore wind or tidal energy foundations, in shallow water and at landfalls, boulder fields or areas of rocky seabed where cable burial is impractical.

Mechanical land testing of Subsea Cable Products



Consisting of a series of interlocking half shell modules to form a vertebrae bend restrictor around the cable, the BOP Cable Protectors are a development from conventional 'articulated pipe' (also known as 'split pipe') and are manufactured in ductile iron to provide:

  • Protection against impact and abrasion
  • Increased seabed stability through added weight
  • Reliable and strong bend restriction to ensure that product minimum bend radius is respected
  • Ease of installation and cost effective protection
  • Greater articulation angle achieved at each joint than conventional split pipe, facilitating use over sheaves and chutes
  • Smooth bore to facilitate longitudinal cable movement where required, for instance for cable pull-in or cable tension relief
  • No sharp edges
  • All bolted assembly. Identical top and bottom castings and use of large fasteners with built in nut recesses for simplicity, speed and reliability of assembly whether onshore, on deck or subsea by divers
  • Smooth outer profile for ease of pulling through apertures and structures

Tooling is manufactured directly from 3D CAD software models for quality and precision. Castings are manufactured in a high capacity, highly automated UK foundry (with full ISO9001 quality and ISO14001 environmental certification) for quality, consistency of fitting, material traceability and dependable lead times.

A range of fittings, including male/male adaptors with cable clamps, female/female adaptors, flange connectors, end pieces, pulling heads and I/J tube centralisers are also available.

Cable Protectors

The BOP Cable Protector has a ball and socket (shoulder) joint between each interlocking module, allowing movement in any direction up to the lock out (minimum) bend radius. Normally supplied in self-coloured grade ENJ-GJS-400-15 ductile iron, with socket head cap screws and nuts as fasteners between each pair, galvanized or epoxy subsea grade paint finishes are also available. Example specifications are:

Bore Internal diameter Pitch (effective length) Lock out bend radius Casting Wall thickness Weight in air/casting Weight in air/metre
120mm 400mm 2.0m 8.5mm 8.2kg 41kg/m
150mm 400mm 2.5m 8.5mm 10.7kg 54kg/m
180mm 400mm 2.5m 8.5mm 12.7kg 64kg/m

Please note: larger and smaller sizes and specifications also available, including for telecom cables and PE pipe applications, please contact us for further information

Male/Male Adaptor ('Dogbone') and Cable Clamp
The male/male adaptor ('Dogbone') is designed to incorporate a cable clamp. This is typically used as the starting point for assembly. The standard cable clamp is designed as a three part clamp which provides greater tolerance of variations in cable diameter and cable 'out of roundness' than a conventional two part clamp, and also provides greater tension holding capability for a given clamping pressure.

Female/Female Adaptor
The female/female adaptor can be used as a transition adaptor with polyurethane tubular cable protectors; within 'second end' protection arrangements for array cables; and to couple runs starting from opposite directions.

End Piece
The end piece fitting has a flared internal bore to provide a mini bellmouth surface for the cable. This is the standard way of terminating a run of cable protectors to provide a smooth transition to unprotected/buried cable.

I/J tube Centraliser
The centraliser consists of a polymer outer shell normally mounted onto a male/male cable clamp, to provide a robust centraliser for I-tube or J-tube installations.

Flange connector
This provides a starting point for connection to a structure.

Please download our product spec sheet here.

Please download typical I or J tube application here.

Please contact us to discuss project specific requirements.

j-tube