Corrosive Environments for HVAC Equipment
Start from where the equipment will run: ISO 9223 category, mechanism and protection.
ISO 9223 Corrosivity Categories (C1–CX) for HVACWhat the ISO 9223 categories C1 to CX mean, how a site is classified, and how the category translates into a coil coating specification.
Coastal HVAC Corrosion by Distance from the SeaHow airborne salt attacks HVAC coils at coastal sites, which ISO 9223 category applies by distance from the sea, and which coating to specify.
Marine and Offshore Heat Exchanger ProtectionHeat exchangers on ships, offshore platforms and quaysides face direct sea spray (ISO 9223 CX). What that means for coil coating and what it cannot do.
Desert Heat, Sand and Salt: Gulf Region HVACWhy Gulf coastal sites corrode HVAC coils so fast — heat, salty dust, night-time condensation and industry together — and what to specify.
Tropical High-Humidity EnvironmentsHow long periods of wetness, warm temperatures and microbial growth corrode HVAC coils in the tropics, and which coating to specify.
Industrial Atmospheres (SO₂, NOx, Chlorides)How sulphur dioxide, nitrogen oxides and chlorides from industry and traffic corrode HVAC coils, and when to move to a chemical-resistant coating.
Wastewater Treatment Plants (H₂S)Why hydrogen sulphide at wastewater plants destroys copper coils fast, which areas of a plant are worst, and what coating to specify.
Indoor Pool Chloramine CorrosionWhy indoor pool air corrodes HVAC coils and dehumidifiers — chloramines, chlorides and constant humidity — and which coating to specify.
Fertilizer, Livestock and Ammonia ExposureHow ammonia, fertiliser dust and livestock air corrode HVAC coils — especially copper — and what coating and coil material to specify.
Formicary (Ant-Nest) Corrosion in Copper TubesWhat formicary corrosion is, why it causes pinhole leaks in indoor coil copper tubes, which indoor chemicals drive it, and how to prevent it.
Data Center Cooling in Corrosive LocationsHow coastal and industrial siting affects data centre cooling equipment — chillers, dry coolers, adiabatic systems and free-cooling air — and what to coat.
Mining and Mineral Processing SitesHow mine and mineral processing sites attack HVAC and cooling coils — abrasive dust, acid gases from smelting and process chemicals — and what to specify.
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