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