Excellent Anti-Corrosion GLS Aeration Tanks
description
Wastewater aeration conditions are high corrosive; Glass-Lined Steel (GLS) tanks have excellent anti-corrosion performance which are an ideal option for aeration tanks.
Glass-Lined Steel (GLS) tanks are fabricated with enamel panels, fitted with self-locked bolts and high-performance anti-corrosion sealant, and boast excellent anti-corrosion properties, making them perfect aeration tanks for wastewater treatment projects.
The Glass-Lined Steel (GLS) tank is a kind of bolted storage tank made from two materials: glass and steel. High-strength TRS (titanium-rich steel) plates and enamels are perfectly fused at high temperatures to form a highly inert inorganic glaze layer. This coating system has excellent anti-corrosion properties and is the best choice for tank.
Material Characteristics of Glass-Lined-Steel Tanks
-Low Carbon, High Strength, High Titanium.
The steel substrate employed in the construction of glass-fused-to-steel tanks is a special high strength enamelled steel with a unique design and superior properties. Its mechanical properties, including yield strength, tensile strength, and elongation, far exceed those of conventional steel sheets.
Specification
|
Coating thickness |
250~450um |
|
pH range |
Standard grade 3~11; Special grade 1~14 |
|
Coating process |
Standard 2 coats 2 fire; 3 coats 3 fire available |
|
Hardness |
6.0 Mohs |
|
Elasticity |
500KN/mm |
|
Service life |
More than 30 years |
GLS tanks are preferred as aeration tanks for wastewater treatment for the following reasons:
● Excellent anti-corrosion performance against biogenic sulfuric acid, chloride and variable pH sewage, with a service life over 30 years.
● Smooth non-porous enamel surface prevents sludge and biofilm adhesion, stabilizes oxygen transfer efficiency an d cuts maintenance work.
●High abrasion resistance to long-term aeration water flow and grit scouring.
● Modular enamel panel design with self-locked bolts, short construction period, flexible volume expansion and reusable.
● Lower total life-cycle cost with minimal renovation and cleaning expenses.
Key Points for Material and Board Selection
● Enamel Coating Standards
Due to the highly corrosive nature of sewage aeration conditions, a specialized dual-layer, high-temperature enamel designed for sewage applications must be used, with an enamel coating thickness of ≥0.25 mm.
● Steel Plate Substrate
High-quality Q235-B carbon steel is selected for the substrate, with thickness matched to the tank height; the lower sections of tall tanks are thickened to withstand water pressure and the lateral pressure of the sludge.
● Comprehensive anti-corrosion accessory package:
Self-locking bolts: Hot-dip galvanized with anti-corrosion coating, or 316 stainless steel;
Sealant: Specialized polyurethane or butyl sealant for wastewater applications—resistant to microorganisms, acids, and alkalis (standard potable water sealants are unsuitable); ensures no swelling or cracking during long-term aeration;
Ladders, mounting brackets, and aeration piping supports: All treated with anti-corrosion finishes.