GREEN EX 925 is a chemical for boiler water treatment, which may inhibit both corrosion and scale formation with one single composite formulation. The corrosion inhibitor contained in this chemical is TANNIC ACID, which is a safe substance compared with others such as hydrazine. Excellent dispersant is also contained, which effectively inhibits scale formation and disperses calcium or ferric oxide sludges.
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TANNIC ACID effectively inhibits corrosion inside the boiler by the following three functions:
- Oxygen removal
- Formation of insoluble films with iron
The dispersant contained in this chemical effectively inhibits scale or deposit formation, which consequently prevents secondary corrosion occurring under the deposit.
As tannic acid do not produce any soluble solid, electric conductivity of boiler water do not increase like sodium sulfite. As a result, the blowdown rate is reduced, together with the amount of heat loss.
Safety of the chemical is improved, as TANNIC ACID is contained , which is a natural compound known as constituent of tea.
Steam would be pure when GREEN EX925 is applied, as no volatile constituent is contained.
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Dose the chemical into the makeup to the dosage shown in the following table:
Dosage in the |
Blowdown rate(%) |
makeup [mg/L] | ×20
|
Storage tanks made of stainless steel or synthetic resin such as polyvinyl chloride should be used.
Name | GREEN EX925 |
Phosphate | Contained |
Appearance | Dark brownish liquid |
pH(1%)* | 11.3 |
Specific gravity* | 1.15 |