1. A GIANT STEP FORWARD FOR SUBSEA PIPE AND STRUCTURAL REPAIR

3. The challenge Aging platforms and surrounding process equipment
Structural strength problems
Leaks in pipes and flowlines
Dents and mechanical damages to pipes and flowlines
Leaks in seawater caissons
Deteriorating structural strength in aging risers

4. The Technology Primer application Preparation of R4DS
Spool ready for wrapping

5. Introduction Caissons
Fuglesangs, in cooperation with 3X Engineering, Equinor and DNV GL, has qualified an innovative solution for the repair of subsea caissons, pipelines and risers affected by corrosion and physical damage.
This subsea solution has this summer been installed on Equinor’s Oseberg South platform in the North Sea.
The solution is applicable for a wide range of similar applications.
Caissons

6. The Oseberg challenge Key Challenges
Subsea Application
Ability to withstand wave action
Minimum surface adhesion of 5 Mpa
Maintain structural integrity
Seal holes up to 300mm in diameter
The Oseberg challenge
To develop a polymer composite wrapping system that can be applied onsite and underwater in low temperature sea water.

7. Damaged Caisson from Pitting Corrosion
Temporary repair utilizing metal plate and Band-It metal straps.

8. Patented subsea wrapping machine
Solution implemented on corroded test pipe
Also strong inter-layer adhesion is crucial

12. DNV GL has participated in the project from the beginning to end.

13. Megapascal (MPa) adhesion Primer / Steel
Adhesion test on primer, 12’’ pipe welded to plate.
Test realized 23/03/2018 at 12 degree celsius.
Individual Results
Position 1 2 3 4 5 6 7 8
Average
« North »
7,3
9,8
12,5
11,5
9,5 11
9,4
9,7
10,1
« South »
7,4
4,4
8,6
10,6
6,8
8,0
« Brush »
10,3
6,6
12,2
5,5
12,4
7,8
6,9
« Hand »
11,4
16,6
8,2
9,6
11,2
Type of failure between glue and primer (cohesive) almost for every failure.
This means that the primer adhesion to steel is mostly better than the values above.

14. REINFORCEKiT® 4D SUBSEA COMPOSITE REPAIR FOR SUBSEA PIPE
2011 V1

15. Complying with ISO 24-817 & ASME PCC-2
3X Subsea composite
Filler
Kevlar® tape
Epoxy resin
Primer
Complying with ISO & ASME PCC-2
External Corrosion
Internal Corrosion
Dent & Leaks
Online repair
Shutdown required
All
diameters
+5°C to
+50°C
Oil
Gas
Water
CONCLUSION:

16. Contact Fuglesangs AS Oslo, Norway
Hans Peter Fuglesang
Erik Michalsen
Fuglesangs UK (Ltd.)
Alan Evans
3X Engineering
Jean-Francois Ribet
To get a copy of this presentation – send an to Erik Michalsen