Background and Problem:
Corrosion results from chemical reactions that naturally occur externally and internally in heat exchangers. Corrosion happens when there is a disturbance in the flow of water, which contains suspended solid particles and chemical compositions rich in chlorides. Results in a loss of stability of the protective cuprous oxide layer. Without this layer, the heat exchanger has no protection from erosion and fouling.
Types of corrosions:
- Pitting Corrosion- Formation of holes or pits on the surface
- Stress Corrosion- Fractures of surfaces by residual stress and environment
- Gas Corrosion
- Salt Corrosion
- Combination Marine/Industrial
Results of corrosion:
- Thinning of tubes from chemical reactions
- Equipment failure
- Pollution to the environment caused from mixing contaminations
- An increase in erosion
- Loss of productivity leading to more downtime
- Increase of energy consumption and maintenance expenses
- Exposing fresh metal to further attack
The most commonly used method to prevent corrosion is through water monitoring, or by paying close attention to the substances that are used in accordance to the heat exchanger’s makeup. There are various coatings and epoxies; however, long-lasting prevention has not been fully accomplished due to issues with durability, an increased heat transfer coefficient, and cost. Adding zinc anodes to the heat exchanger bonnet has also been used, but due to the overwhelming amount of metal lost, zinc anodes need to be inspected regularly and replaced as required.
New Technology: HeatX Corrosion Protection
HeatX has been demonstrated to significantly reduce the frequency of costly maintenance operations, and extend the overall “useful life” of assets. HeatX has been qualified to show corrosion resistance, abrasion resistance, and chemical compatibility with both water, hydrocarbon, and mixed phase conditions.
The water based formulation can be flexibly applied to unprepared corroded surfaces and still achieve full performance. In addition, the overall thickness of the HeatX coating is less than 4 mil, and does not affect the overall heat transfer performance.
Benefits of HeatX:
- Water-and-oil compatible coating material allows for use in mixed-phase and oleic systems.
- Resistant to abrasive wear due to particulate contaminants. Capable of surviving intake silt from unprocessed, unfiltered sea water.
- Long lasting chemical resistance and compatibility with water and hydrocarbon-based fluids.
- Minimize downtime and maintenance cost
- Long-lasting results that extends the life of the heat exchanger