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COMPOSITE REPAIRS

COMPOSITE REPAIRS. Modern, non-metallic technology to assist in operational plant, pipework, vessel and pipeline maintenance. COMPOSITE REPAIRS. Corrosion Prevention Proactive leak prevention External & Internal Defects. COMPOSITE REPAIRS. Return to original wall strength and integrity

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COMPOSITE REPAIRS

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  1. COMPOSITE REPAIRS • Modern, non-metallic technology to assist in operational plant, pipework, vessel and pipeline maintenance

  2. COMPOSITE REPAIRS • Corrosion Prevention • Proactive leak prevention • External & Internal Defects

  3. COMPOSITE REPAIRS • Return to original wall strength and integrity • Contain Design Pressure • Prevent through wall defects leaking • Repair non linear geometries

  4. Standardisation • Global JIW including Saudi Aramco, Shell, BP, Petrobras, Total, Statoil, Amerada Hess and British Gas • UK Document AEAT 57711 • ISO 24817 • ASME PCC2

  5. Standardisation Standards all cover: • Design • Installation

  6. Design Process Client supplies information on critical parameters: • Diameter • Pressure • Original Wall Thickness • Temperature • Life Expectancy • Defect measurements

  7. Design Process • Based on Barlow • P=2st/D Pressure is proportional to the material strength, its thickness and the pipe diameter

  8. Design Process Three basic cases considered • Remaining wall thickness carries some of the load • Composite carries all the load • Through wall defect

  9. Design Process - Factors A number of factors is applied to increase repair thickness • fc - a service factor to account for cyclic fatigue • foverlay - derates the repair in the case of insufficient space in applying the composite • fstress - derates the repair when stress is present due to components (tees, bends, reducers) • fT - temperature effect on composite allowables

  10. Design Process - Limitations • Repair scenarios are in 3 Classes depending on temperature, pressure and service • Repair must not be exposed to temperatures greater than Tg - 30 • Repair thickness greater than 25mm is unlikely to be useful because of laminate instability • Internal defects that will result in WT <1mm during repair lifetime, treated as through wall

  11. Installation • All repairs must be applied by trained and certified applicators • For each repair situation a risk assessment shall be carried out • Each repair should be covered by a method statement that addresses each of the main procedures to be carried out • Surface preparation is the single most important operation in the achievement of a successful repair

  12. Installation The key hold points to be observed during a repair are dependent on the repair class and should include: • Method Statement • Materials Preparation • Surface Preparation • Tests on Repair Laminate, to include cure, thickness and dimensions • External inspection

  13. Installation • A logbook should be opened for each repair and retained for its service life • Health and safety issues should be fully addressed in the risk assessment and repair method statements

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