Chimney Stack Protection Against SO₂: A Case Study

10th December 2024

A chimney stack in Poland, essential for emissions management, required protection against accelerated corrosion due to ongoing exposure to sulphur dioxide (SO₂) gas at 110°C (230°F). This challenging environment necessitated a robust chimney stack protection solution to prevent further degradation and extend the structure’s lifespan. Resimac’s coating system was selected for its proven durability and ability to withstand high temperature, high corrosion conditions.

Resimac’s Chimney Stack Protection Solution

Surface preparation by abrasive blasting to SA2.5 standard with a 75-micron profile.
Stripe coating of weld joints with 206 Ceramic HTA Fluid applied at 400 microns.
Full surface coating with 206 Ceramic HTA Fluid, achieving a total dry film thickness of 1mm.

Application Details

The surface of the chimney stack was abrasive blasted to ISO 8501/4 SA2.5 (SSPC SP10/NACE 2) standards, achieving a 75-micron angular profile to remove corrosion and ensure optimal coating adhesion. All weld joints, which are particularly vulnerable to corrosion, were stripe coated with Resimac 206 Ceramic HTA Fluid to a thickness of 400 microns for enhanced protection. While the stripe coat was still wet, the entire chimney surface was coated using brushes, rollers, and plastic applicators. This process built up the coating to a nominal dry film thickness of 1mm, creating a seamless, highly durable protective layer capable of resisting the aggressive effects of SO₂ gas and elevated temperatures.

Products Used

206 Ceramic HTA Fluid

Results and Benefits

The application of 206 Ceramic HTA Fluid not only provided robust protection against corrosion but also improved the structural stability of the chimney by reinforcing areas most susceptible to damage, such as weld joints. The smooth, impervious surface reduced the accumulation of contaminants, making future inspections and cleaning easier and less costly. This solution also enhanced operational safety by mitigating the risk of structural failure caused by ongoing corrosion. The extended service life of the chimney reduced the need for unplanned maintenance and ensured uninterrupted emissions management, critical to meeting environmental compliance standards.