RiSE issue 5

How we added value by taking something away

As part of a focus on cost reduction across Balmoral’s range of SURF products, the boltless bend restrictor is designed to improve assembly efficiencies and reduce installation time.

The boltless restrictor technology (patent pending) combines the existing bend restricting function with easier assembly thereby decreasing installation times. In line with Balmoral’s acknowledged track record for product innovation, real value has been added by taking something away.

Craig Sharp, engineering manager at the company, said: “This unique and truly boltless design uses the geometry of the fins to resist separation and maintain the unit assembly. The frictional interaction between the features is sufficient to replace expensive corrosion resistant high strength assembly bolts.

“Conventional restrictors lock out and transfer load utilising a neck to box interface. Changing this premise to a box to box connection allows geometry optimisation for both function and cost reduction.

“The improved locking feature increases the load distribution to allow a reduction in product thickness providing a real saving in raw materials.”

Balmoral boltless bend restrictors

Pictured at the recent Australian Oil and Gas exhibition, the boltless restrictor is perfect for environments that preclude metallic components.

As well as covering specialised workscopes the boltless restrictor is suited to common field requirements such as flying leads, arrays, etc. This revolutionary product is generating a lot of interest and we believe it will become the industry standard in an increasingly competitive market.

Benefits

  • Rapid installation time creating significant offshore savings
  • Revolutionary boltless interlocking method fully utilising the material’s strength
  • Superior load capacity for long and short-term conditions
  • Excellent temperature resistance, specifically important to long term creep performance
  • Significant multiple unit cost efficiency savings
  • Minimises sub-supplier risk
  • Materials and design methodology in accordance with API 17L 1 & 2
  • Reduced quantity of small loose parts (nuts, bolts, washers, etc)

Features

  • Interlocking male and female mouldings
  • Innovative interlock system (patent pending) that removes the need for fasteners
  • Bend restrictor lockout prevents cable/pipe over-bending
  • Proprietary design and testing delivers long service life in extreme environments
  • Material fully API 17L 1 & 2 certified
  • Material is mercury and MbOCA free (REACH compliant)

Design Specification

  • Typical cable diameter: 20-450mm
  • Typical bend moment: 2-120kNm
  • Standard minimum bend radius: 1-8m
  • Materials: Balmoral marine polyurethane
  • Design life: 35 years
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