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Bend restrictors

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Information about Bend restrictors
Design

Published on February 17, 2014

Author: dgdg-eu

Source: slideshare.net

Description

Bend Restrictors

Are present at the interface between flexible service lines (flexible flow-lines, umbilicals or cables) and rigid structures to prevent the over-bending of the service line during installation and service.

They are designed to be flexible but lock at a bend radius (MBR) greater than that of the service line, providing protection to the line from buckling or over bending.

Near neutrally buoyant half vertebra (shore 82D) are joined with corrosion resistant fasteners (UNS S32760).

Using extensive experience DGDG-EU have designed standard parts that comply with API 17J.
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DGDG-EU bend restrictor standardisation October MMXIII

Introducing DGDG-EU Bend Restrictor Standardisation 2

Agenda Slide 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. Oct - MMXIII Introduction Agenda Polyurethane bend restrictors Vertebra material selection Standard internal Ø Service line MBR & Ø Variables Vertebra moment resistance (M ) 2nd Moment of area (I ) Line tension (F ) Factors of safety DGDG-EU 13. Vertebra moment resistance 14. Line tension 15. Other material selection ------------------------------------------16- 20. Examples 21. Bolt calculations 22. Standard products 23. Different vertebra & materials 24. Bespoke designs 25. AOB 26. Thank you 27. Contact Bend Restrictor Standardisation 3

Polyurethane bend restrictors • Are present at the interface between flexible service lines (flexible flow-lines, umbilicals or cables) and rigid structures to prevent the over-bending of the service line during installation and service. • They are designed to be flexible but lock at a bend radius (MBR) greater than that of the service line, providing protection to the line from buckling or over bending. • Near neutrally buoyant half vertebra (shore 82D) are joined with corrosion resistant fasteners (UNS S32760). • Using extensive experience DGDG-EU have designed standard parts that comply with API 17J. DGDG-EU Bend Restrictor Standardisation 4

Vertebra material selection • • • • • Polyurethane - Generic Specific gravity Tensile strength (σ ) 41-64MPa Operating temperature Standard colour • Sub supplied DGDG-EU = 82 Shore D = 1.14 = 41MPa = -10° + 60° C = Yellow 3.1B Certified Bend Restrictor Standardisation 5

Vertebra internal Ø Type T012 T015 T019 T025 T033 T044 T057 T070 DGDG-EU Service Line Ø Element Max bore Ø Min 0.13 0.12 0.09 0.16 0.15 0.12 0.20 0.19 0.15 0.26 0.25 0.19 0.34 0.33 0.25 0.44 0.43 0.33 0.58 0.57 0.43 0.72 0.7 0.57 Bend Restrictor Standardisation 6

Service line minimum bend radius & service line Ø Service line MBR (l ) = 10 x service line Ø DGDG-EU Bend Restrictor Standardisation 7

Vertebra moment resistance & line tension calculation definitions M σ I D d F l DGDG-EU = = = = = = = Moment resistance Tensile strength 2nd moment of area External Ø Internal Ø Line tension MLR restrictor (≥ MBR umbilical) Bend Restrictor Standardisation 8

Moment resistance calculation (M ) hollow cylinder • Bending theory - peak bending moment - cylinder 2

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