SEACON » Blog Pressure Balanced Oil-Filled (PBOF) Splice-Less Optical Jumpers - SEACON

Pressure Balanced Oil-Filled (PBOF) Splice-Less Optical Jumpers

23/4/13.

Pressure Balanced Oil-Filled (PBOF) Splice-Less Optical Jumpers

 

Pressure Balanced Oil-Filled (PBOF) Splice-Less Optical Jumper
Pressure Balanced Oil-Filled (PBOF) Splice-Less Optical Jumper

 

KEY FEATURES

  • Integral optical fiber management system within hose to mitigate excessive movement or forces applied directly to the internal fibers
  • Good cable flexibility, typical 150mm (5.9″) bend radius
  • Enhanced visibility, typically Orange and Yellow in color (other colors available)
  • Deployment techniques similar to jacketed cable
  • Good ROV maneuverability during connector mating
  • Easy interface to connector
  • Early leak detection; some hoses are designed for over-pressure and may be used to offer visible leak paths
  • Ease of repair
  • Double Barrier against water ingress
  • Temperature and Pressure Compensated
  • Size 13mm & 20mm ID (Other sizes available upon request)
  • Multi-mode and single-mode available
  • No optical splice boxes
  • Over 20 splice-less optical jumpers supplied to date
  • Longest is 208m supplied to date

ADVANTAGES / DISADVANTAGES
Splice-less optical jumper systems are not for everybody.

ADVANTAGES

  • The elimination of an optical splice box from the central area of the jumper system. SEACON do not consider this a major advantage as their splice boxes are tapered.

Tapered splice box
Tapered splice box

 

DISADVANTAGES

  • More difficult to manufacture as each connector element cannot be manufactured modular
  • Splice boxes allow significantly easier factory and field repair/maintenance
  • More expensive

DESIGN RATINGS

  • 25 year life
  • Working Depth: 4,500 meters
  • Bending Radius: Typical 150mm (5.9″) bend radius
  • Working Temperature: -4ºC to +25ºC
  • Storage Temperature: -40ºC to +70ºC

MATERIALS

  • Inner Liner – SBR
  • Outer Jacket – NBR/PVC
  • Armour – Polyester
  • Strain Element – Aramid (Kevlar)

PRINCIPLE OF OPERATION

Attaching fiber optic subsea connectors to PBOF cables have become a very common method for subsea jumpers and distribution assemblies. The hose is attached to the subsea connector by a robust mechanically swaged/machined fitting that adapts to the hose. These engineered fittings include filling ports and are easily mounted to the subsea connector with an adapter housing utilizing o-ring seals. These subsea connector jumpers are typically 30 meters in length on average, but can be constructed in a variety of lengths (up to 500m) to suit the needs of a particular application. The PBOF approach utilizes a main elastomeric tube (hose) as a mechanically protective conduit for fiber optic cores. The elastomeric conduit is filled with a pressure-compensating fluid (typically a dielectric) allowing the seawater pressure to be freely communicated across the flexible hose walls, to the interior oil volume. Equalizing the pressure and temperature in the assembly allows for the variable effects of ambient pressure and temperature during typical storage and operational regimes. PBOF hoses have been field proven for many years throughout the marine and submarine industries, this option for cabling provides for a reliable, configurable cable system suitable for many subsea applications.