In these industries, nitrogen is mostly deployed as ’blanketing’. It is used to insulate large hot-water storage tanks. In other words, hot water is covered with a layer of nitrogen which is blown into the storage tanks and kept at pressure. The blanket above the water constitutes a residual percentage of 1% and prevents oxygen from penetrating the water. In addition, it prevents corrosion of the steel wall of the tanks. SOTEX primarily supplies its systems to this market. A smart control unit is added to the system, which governs expansion.
These days, heat-storage tanks are usually upright. The horticultural industry requires hot water during the day. This entails release of CO2 which is used in the glasshouses to force or stimulate the growth of the crop in question. Excess heat produced during the day can be stored in the upright storage tanks.
During the night, this heat can be used by retrieving it from the heating system. This reduces the need to heat the glasshouse as hot overnight. In this system, the water in the storage tanks expands and contracts, creating changes in pressure. The SOTEX system monitors this process, continuously protecting the tanks against over or under pressure situations.