Dehumidifiers for blast cleaning and painting

CYM Materiales designs and supplies a range of industrial dehumidifiers for blast cleaning and painting that control ambient humidity in blast rooms, shipyards, petroleum tanks and large maintenance projects. The correct blast cleaning and painting procedure requires the steel surface to remain at least 3°C above the dew point: if moisture condenses on a blast-cleaned surface, it causes flash rusting and compromises the adhesion and cure of the coating. The world's leading paint manufacturers — Jotun, International Paint, Hempel — do not guarantee the quality of their coatings unless they are applied in a humidity-controlled environment.

The key benefit of the dehumidifier is its ability to control the working environment, saving costs for the contractor and improving coating application results. With the system operating, the blast-cleaned surface can remain rust-free for one to two weeks without applying the coating. This allows the entire surface — even on large installations — to be blast-cleaned before painting in a single application, after removing blast debris and dust. Work can begin early in the morning and even continue in rainy weather, without dependency on climatic conditions. Additionally, dry air is essential for steel abrasive: overnight humidity can condense inside the blast pot and oxidize the abrasive; the dehumidifier keeps the shot dry and in optimal working condition.

CYM offers three container-type dehumidifier ranges in capacities from 6,000 to 18,000 m³/h, selected according to the climatic conditions of each project: the DHS range for hot climates (24°C to 38°C), the DHP range with Freon pre-heater for temperate climates (10°C to 38°C) and the DHD range for extreme temperatures (−20°C to 38°C). All models supply conditioned air at 25°C ±3°C with relative humidity below 45% and a dew point of 10°C, with 90% efficiency air filtration, noise level ≤80 dB(A) and IP55 control panel.