Published on February 17, 2014
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
General. Bend Restrictors (BR) are designed to prevent over-bending of flexible pipes/umbilicals/cables at the interface with rigid structures. Material/Design
Bend restrictors are used to protect flexible pipelines from over bending.
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