White Papers

New Metallurgy: Anti-PTASCC Solutions For All Petroleum Refineries

It is known that the conventional stainless steels such as Type 316L, Type 317L, Type 321(H) and Type 347(H) have higher risk to occur PTASCC (PolyThionic Acid Stress Corrosion Cracking) in Hydrotreating units, Hydrocracking units and Delayed Coker units etc of petroleum refineries. PTASCC occurs by the combination of 3 factors; formation of Polythionic acid due to exposure the metal sulfide scale to oxygen and water in the aqueous phase, residual tensile stress and sensitized microstructure having the Cr carbide precipitation at the grain boundary by welding.

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Next Generation of Epoxy Cured Cements Outperform Older Technologies

This study conducted by Florida Atlantic University was carefully designed to test the resistance of three types of cementitious products to the acidity associated with highly corrosive wastewater environments. The relative chemical resistance of calcium aluminates was compared to new generation epoxy modified mortar. Tests were conducted in the same acidic environments that would be present in wastewater infrastructure. The results indicated significant differences between the epoxy modified mortar and the calcium aluminates when comparing weight loss and pH levels. The outcome demonstrated that the epoxy modified mortar substantially outperformed the aluminates, pure fused or other.

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