Large-scale Buffer/Reception tanks of Steel Epoxy Coated
description
Buffer tanks are classified as pressure vessels. Essentially, they function as pressure-stabilizing and volume buffering components within fluid systems. Common process media include water, compressed air, oil products, wastewater, biogas, steam and other fluids. Installed upstream and downstream of pumps, fans, compressors, pipelines and valves, these vessels absorb fluctuations in flow rate and pressure to mitigate hydraulic shocks and pressure surges.
Epoxy coated steel tanks are best choice as buffer/reception tanks for circulating cooling water, clarified water & reclaimed reuse water.
The epoxy coated bolted steel tank is mainly consisted of steel panel that has been internally and externally coated with a layer of epoxy-based protective paint. Fusion bonded epoxy is an electrostatically applied coating system with superior coverage and uniform coating thickness.
Specification
|
Coating thickness |
80~450um |
|
pH range |
Standard grade 3~11; Special grade 1~14 |
|
Hardness |
2.5Mohs |
|
Elasticity |
500KN/mm |
|
Service life |
More than 15 years |
Advantages of Epoxy Coated Steel Tanks
● Advantages of the anti-corrosion structure
FBE involves electrostatically spraying powder onto steel plate preheated to 220–245°C, followed by melting and chemical cross-linking/curing.
The coating bonds chemically to the steel, ensuring exceptional adhesion and eliminating the risk of delamination or blistering.
It forms a seamless, dense film with minimal pinholes, offering resistance to water, chloride ions, and H₂S penetration that far exceeds that of on-site brush-applied epoxy coatings.
● Medium tolerance range
pH Range: Stable operation between pH 4 and 11; suitable for a wide range of applications, including biochemical wastewater, anaerobic effluent, biogas condensate, circulating cooling water, and reclaimed water reuse.
Hydrogen Sulfide (H₂S): Resistant to biogenic hydrogen sulfide corrosion.
Anaerobic biogas buffer tanks utilize a specialized sulfide-resistant modified FBE coating that withstands H₂S attack in both the liquid and gas phases, offering several times the durability of standard liquid epoxy coatings.
Chloride ions: Tolerates low to moderate chloride concentrations; fully suitable for saline municipal wastewater.
Operating temperature: Single-layer FBE is suitable for long-term use at ≤85°C; the high-temperature dual-layer type withstands up to 120°C—offering ample performance margin for ambient-temperature water treatment applications.
Smooth inner wall: Resists sludge accumulation and minimizes biofilm adhesion, ensuring cleaner drainage from the buffer tank and preventing clogging.
● Adapting to the operating characteristics of the buffer tank
Surge tanks are subject to fluctuating pressures and frequent filling and discharging cycles; repeated pressure variations can cause fatigue cracking in standard paint coatings.
In contrast, FBE forms a rigid, thermoset network structure upon curing, offering excellent fatigue and peel resistance—making it ideal for the pulsating pressure environments found at pump outlets.
Factory-applied integrated coating ensures controllable quality, typically comes with a 20- to 30-year warranty, and entails minimal maintenance costs.