RISα
The use of nitrogen enables anti-corrosion and anti-rust treatment. RISα is equipped with a new technology called "EMIC", which efficiently produces deoxygenated water.
Water contains air in which oxygen is dissolved (At 20°C, the saturated dissolved oxygen level: 8.84 mg/L). Water that contains oxygen can oxidize metal piping, which leads to rust and the growth of aerobic bacteria. To reduce this oxygen level, chemicals such as oxygen-removing agents are often added, but these additives can affect people and the environment.
EMIC, which is installed in RISα and is designed to mix gas and liquid, removes dissolved oxygen from water and replaces it with nitrogen. This lowers the dissolved oxygen level and makes it possible to reduce or eliminate harmful chemicals. Nitrogen, which accounts for about 78% of the air, is stable, non-toxic, and does not bond with other molecules at atmospheric pressure, making it safe.
RISα removes concerns about chemicals that affect the human body or reddish water caused by rust, and its performance remains steady over a long period.
Features
- Box type with built-in pump, and panel type for wall mounting
- Compact design, installable in limited spaces with quick setup
- N2 gas cylinder(s) not required
- No contact between nitrogen separator and water, enabling long use
- Suitable for factories avoiding hydrazine-based oxygen removers
- Management cost reduced with stable nitrogen concentration
- Stainless-steel-based wetted materials
Main applications
- Deoxygenating boiler feedwater
- Protecting boiler interior from rust and deterioration while not in operation
- Treating closed-loop cooling water
- Deoxygenating mold-cooling water
- Preventing corrosion in air-conditioning piping
- Preventing reddish water in water-supply and hot-water piping in buildings and hotels
How it works
Compressed air supplied through the N2 separator inlet enters the inside of each polyimide hollow fiber in the separator. As the compressed air flows through the hollow fibers, oxygen selectively permeates through the fiber walls, allowing N2 to exit from the separator outlet.
Reaction mechanism
RISα repeats pressurizing and depressurizing steps during nitrogen purging, improving the purging efficiency.
How corrosion occurs
Corrosion of iron occurs through reactions at the anode and the cathode. Removing either the anodic or cathodic reaction can slow corrosion. In other words, reducing the dissolved oxygen in water can help control corrosion.
Specifications
| Specifications | Fluid name | Water |
| Volume of nitrogen-purged water | ・2 m3/h or lower ・4 m3/h or lower |
|
| Dissolved oxygen concentration after purge | 2.0 mg/L or lower (Water temp. 20°C for volume above) |
|
| Operating environment | Temperature range of raw water | 0–80°C (non-freezing) |
| Operating temperature/humidity | Temperature: 40°C or lower Humidity: 80% or lower (non-freezing) |
|
| Material | Casing | SS304 |
| Wetted material | EMIC: SS303 Piping: SS304 |
|
| Gas section | Piping: New urethane | |
| Connections | Power source, Electric energy (pump, operation mode, daily management) | |
| Weight | 40 kg | |