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Engineered Composite Repair Systems

HJ3 is a leading manufacture of engineered composite repair systems designed to extend the life of critical assets in process facilities.

CarbonSeal™ Products

Maintaining piping integrity within petrochemical plants and refineries is critical to operations. HJ3’s line of engineered repair systems are designed to address a wide range of temperatures , pressures, geometries and chemicals, offering a safe and cost effective solution to common integrity problems. Whether its preventive repairs associated with a CUI program or emergency repairs on your flare line, HJ3 can offer a solution to extend the life of corroded or damaged piping in your facility. All HJ3 engineered repair systems conform to ASME PCC-2, ASME B31, ISO 24817, DOT, API.

  • CarbonSeal – HT™ – High Temperature
  • CarbonSeal – AR™ – Abrasion Resistant CarbonSeal
  • CarbonSeal – CHEM™ – High Chemical CarbonSeal
  • CarbonSeal – SUBSEA™ – Underwater CarbonSeal
  • CarbonSeal – NSF61™ – Potable Drinking Water
  • CarbonSeal – FLARE ™ – Flare Line Repairs

Emergency Repairs

HJ3 provides unmatched response time and support for critical repairs to help you stay online. We understand the impacts of unexpected downtime and have created dedicated engineering and technical teams to support our contractors and their clients under the most demanding conditions.

Emergency Services Include
  • 1hr turnaround on design calculations
  • PE stamped designs
  • Same day shipment of repair materials
  • Project kickoff support
  • Emergency onsite QC
  • Emergency applicator trainings

Common Repairs

  • Flare Lines
  • Acid Lines
  • Cooling Water Piping
  • Sour Water
  • Fire Suppression
  • Piping Blow
  • Down Lines
  • Chemical Attack of Process Lines
  • MIC Corrosion
  • Corrosion Under Insulation (CUI)
  • Hydrocarbons


CarbonSeal™ used to wrap and seal leaking corroded steel riser pipe after a “stop gap” was installed.


This repair completed in 2003, was the first installation of the CarbonSeal™ System. In total 13 risers were repaired in one week. Today, over 10,000,000 Square feet of CarbonSeal™ has been installed. 

Case Histories

To process your calculations, simply click on the button below to download the HJ3 Engineering Assessment Form.
Please email the completed form to

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