REINFORCEKiT® 4D, Leak on circumferential weld – Australia
High-performance composite repair solution for pipe reinforcement
Overview
In June 2025, a leak was detected on a weld of a 6.6" pipeline transporting MDEA (Methyldiethanolamine) at 150°C. Considering the chemical aggressiveness of MDEA and the high operating temperature, a robust repair solution was required. 3X ENGINEERING (3X), through its local distributor, implemented a composite repair using REINFORCEKIT® 4D (R4D) with high-temperature resin.
Results
Samples of resin were taken during each tape impregnation for quality control. Hardness measurements were performed 1 day after job completion. Each sample was tested and validated using a calibrated Shore D hardness tester. The repair solution provides a 20-year design life, maintaining the pipeline's structural integrity and ensuring safe and reliable operation.
 Defect type |
Leak on circumferential weld |
Details |
6.6" MDEA line, bend section, temp. 150°C, press. 7 bar |
Location |
Australia |
3X Product type |
REINFORCEKiT® 4D |
SCOPE OF WORK
In accordance with ISO 24.817 standard and 3X calculations, 6 layers of R4D with high-temperature epoxy resin were specified to restore pipeline's integrity. To ensure optimal adhesion of the composite system, the pipe surface was prepared using a Bristle Blaster® machine, achieving a surface cleanliness equivalent to St3/SA 2.5 and a surface roughness exceeding 60 µm (Rz). Hygrometric conditions and surface roughness were verified and confirmed to comply with the specified requirements prior to proceeding with the composite reinforcement.
After surface cleaning using acetone and rags, the composite reinforcement was performed as follows:
- A 3X high-temperature, chemically resistant filler was applied to the defective weld area to restore geometry and ensure load transfer.
- A base layer of 3X high-temperature epoxy resin, compatible with MDEA properties, was applied to protect the pipe against corrosion and chemical attack.
- The composite reinforcement was installed using Kevlar® tape impregnated with 3X high-temperature resin. A total of 6 layers were wrapped around the defect, covering a total repair length of 1455 mm.
- A final resin layer was applied to protect the composite system followed by the installation of an identification plate to ensure full repair traceability.
