HQ Address: 2440 West Majestic Park Way, Tucson, AZ 85705


HJ3 has a well-earned reputation among its global, Fortune 500 clients as a problem-solving partner that uses its industry agility and uncommon speed to provide solutions, fast. HJ3 carries its integrity, its grit and its relationship-first approach in its front pocket and never compromises when it comes to quality.

As the leading provider of high strength carbon fiber composite systems, HJ3 supports a Global Network of certified installers, operators and engineering firms with unmatched engineering, support and materials for even the most challenging composite installations.

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Getting Started

HJ3’s engineering team is ready to process your application today. Whether you need structural engineering, installation training, or support on estimating your detailed proposal, HJ3’s customer service and engineering team are ready to support you. Contact us today!

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Pipeline Repair Systems

HJ3’s line of Pipeline Repair Systems are designed to address corrosion, erosion, dents, weld defects and metal loss common with pipeline operation. Tested in compliance with industry standards, HJ3 offers the best in class engineering, training and site support to ensure fast, safe installations every time.

Whether it’s an ongoing project or an emergency spot repair, HJ3 can support your project with same day engineering, material shipments and training mobilization.

Common Applications

  • Manufacture Defects
  • Cracks
  • Dents
  • Corrosion
  • Erosion
  • Gouges
  • Metal Loss


CarbonSeal™ is a high strength carbon fiber composite system designed in compliance with ASME PCC-2 Article 4.1, ASME B31 standards and ISO 24817. CarbonSeal™ can be applied to process piping systems and pipelines to restore integrity lost due to corrosion. CarbonSeal™ repairs are fully supported with structural calculations performed by licensed professional engineers who specialize in composite design.

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  • Unmatched strength per ply equals less layers, reduced cost and faster installations
  • No post-cure required
  • Conforms to tees, elbows and straights
  • Wide range of temperature and chemical resistance

Additional Protection

  • 1 to 3 hour fire protection per UL-1709
  • CarbonSeal™ can be designed to dissipate static electricity (ESD) for use in intrinsically safe environments

Technical Data

  • Fabric: Carbon
  • Ply Thickness: 0.051-inches
  • Shore D Hardness: 81
  • Max Installation Temp: 200°F (93°C)
  • Max Operating Temp: 196°F (91°C)
  • Min Operating Temp (after full cure): -58°F (-50°C)
  • Shelf Life: 2 years
  • Chemical Resistance: Excellent for pH 2.5 to 12.5

Case Studies

See how HJ3’s CarbonSeal™ Pipeline Repair Systems have strengthened damaged or corroded piping systems and DOT pipeline.