Exchanger Resortation - Tube ID Coating

Evolution of Condenser Tube Coating

Curran International’s tube ID coating has its origins in a power plant project in the early 1990’s, where a tube ID coating was being evaluated as a repair for condenser tube cooling water corrosion. Post application, evaluation of the tube ID coating and condenser performance satisfied the client, and the project was documented in an industry report.

Since that early project Curran International has made radical improvements to surface prep and tube ID coating methods; it was awarded a US patent for its atomized spray application in 1996. Curran International has become the industry leader for tube ID coating solutions and provides applications to salvage corroded exchangers as an option to re-tubing or exchanger replacement.

Important to the integrity of tube ID coating application is tube ID cleaning, Curran developed tools and methodology to more efficiently clean full length tube IDs using dry abrasive. Curran can achieve NACE 1 (SSPC-SP5) “white metal” cleanliness down small diameter tube IDs of any exchanger length.

Tube ID coating requires that applications be uniform, homogeneous, and pass a holiday spark test to assure coating continuity. Curran has multiple application techniques to deliver high functionality protective coatings to full circumferential ID. Thin film coating applies a protective-inert barrier between the water and reactive substrate; pitted tubes are “repaired” and protected from new corrosion.

Curran is applying solutions

  • Tube ID coatings reduce fouling and boundary layer drag
  • Reduced pressure drop, optimized tube ID flow
  • Eliminate precipitates, mineral scaling, fouling
  • Resist corrosion under deposits

  • The Curran tube ID coating method has been deployed for in-situ condenser applications globally, and application systems enable tube ID coating in exchangers with limited work area. Curran can provide installation of tube end ferrules as part of a coating repair of condensers in high velocity, high turbidity water services where a sacrificial alloy repair is needed.
    Contact Curran about in-service exchanger maintenance and restoration using thin film coatings, tube end ferrules and alloy liners.

    Case Studies

    Coating Cooling Water Exchangers:

    View PDF

    Exchanger Parts Coating:

    View PDF

    Tube Condition Coated vs Uncoated

    View PDF


    Contact Curran