Flintstone-F

Dual Axis Fairlead Fact Sheet

CHALLENGE IMPROVE DELIVER

Dual Axis Fairleads

The Dual Axis Fairlead is designed to eliminate out of plane bending and offer a far more compact design compared to conventional dual axis fairlead arrangements.

APPLICATIONS


  • The Dual Axis Fairlead is used where metocean conditions induce vessels motions in a single degree of rotation would result in out of plane bending leading to early fatigue failure
  • The design is suited to all applications on vessels with a spread moored configuration

BENEFITS


  • Unique pivoting chain stoppers allow much higher pre loads to be applied without inducing out of plane bending in the chain
  • Elimination of the “pillar” style bearings greatly simplifies the ships structure required to support the fairlead
  • Integrated tension monitoring provides a rugged and reliable system for load monitoring
  • Greatly reduced weight
  • Compact
  • Simple to install and remove if required

FEATURES


  • Pivoting chain stopper
  • Line pull in load path and in service load path are perfectly straight
  • Trunnion mounting direct to hull
  • Complies fully with latest classification society requirements for analysis, materials and testing
  • Flintstone tension monitoring system

STORY


The Dual Axis Fairlead is being developed to meet the requirements for reduction in weight and cost in the latest FPSOs.
Traditional dual axis fairleads have relied on a design which is complex, heavy and induces stresses in the hull that are eliminated with the Flintstone design.
The rationale behind the design simplification is that the opillar bearing is not required as the amount of rotation about the vertical axis can be taken by the uni joint.  FPSDOP moorings are pre-set and their position is accurately known so there is no need for the large rotation offered by the pillar bearings which in practice seize up through lack of use which in turn creates excessive friction and leads to out of plane bending.
By simplifying the design we reduce costs, make the design more compact and lower weight.

SPECIFICATION


Fairleads can be supplied to meet the new rules for mooring systems components as issued by the International Classifications.  Flintstone is approved by DNV and working with BV and ABS on a number of projects.
Materials are sourced from approved forging suppliers.
Painting and corrosion protection system to customer requirements.
In house minimum break load test capability (40000KN).

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Flintstone has a totally integrated management system that covers all aspects of the company’s activities and how we operate. In 2012 the company gained ISO 9001 accreditation with DNV and this was supplemented early in 2014 with ISO 14001 and OHSAS 18001. In 2016 Flintstone’s accreditation transferred successfully to the updated ISO 9001:2015 and 14001: 2015 standards.

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Flintstone Technology Ltd,                       Constable Works, Fowler Road
West Pitkerro Industrial Estate, Dundee, Scotland DD5 3RU

Tel: +44(0)1382 725 120

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