Corrosion is one of the most costly threats to bridge infrastructure worldwide. By circulating dry air and maintaining a relative humidity below 50%, DST desiccant dehumidifiers stop corrosion before it starts — without chemicals, without heavy maintenance, and without adding weight to the structure.
Steel corrosion is an electrochemical process that requires both oxygen and moisture. Mild steel components and high-tensile support wires are particularly vulnerable — left untreated, rising humidity levels cause progressive deterioration, costly maintenance cycles, traffic restrictions, and in severe cases, full bridge closures.
By continuously circulating dry air through cable stays, trusses, box girders and anchorage chambers, DST systems maintain relative humidity below 50% — the threshold at which corrosion effectively stops. Unlike traditional anti-corrosion painting, dehumidification adds no weight to the structure, requires minimal maintenance, uses no chemicals, and reliably protects enclosed or hard-to-reach areas where paint simply cannot reach.
Watch how DST desiccant dehumidifiers are installed and operated on a real bridge project. Our systems circulate dry air through the internal structure, creating an environment where corrosion cannot take hold — ensuring long service life with minimal maintenance.
2,460 m long — designed for a 120-year service life. DST dehumidifiers installed inside the bridge deck protect the full internal steel structure.
The world’s widest suspension bridge. A DST recirculating system protects the full length of each steel cable stay.
The world’s longest sea crossing at 50 km. DST dehumidifiers protect the steel box girders throughout the full span.
Anti-corrosion painting is costly, labour-intensive, and demands regular reapplication — often requiring scaffolding and traffic restrictions. In enclosed spaces such as cable stays and box girders, it is frequently impractical or impossible.
DST desiccant dehumidifiers offer a proven alternative: continuous dry air circulation that protects steel structures around the clock, with minimal intervention. No chemicals. No added structural weight. No repainting cycles. Just reliable, long-term corrosion protection — backed by more than 30 years of installations across four continents.
Get notified about new DST articles
EN
SV