What typically causes corrosion associated with reboilers?

The primary cause of corrosion associated with reboilers stems from the hot process fluid that may decompose and form acids during operation. In reboilers, the fluids are often subjected to high temperatures, which can lead to the thermal degradation of materials within the process. This degradation can result in the formation of corrosive substances, such as organic acids. These acids, when present in the reboiler, can accelerate corrosion by attacking the metal surfaces, leading to pitting, thinning, or other forms of localized damage.

Moreover, the presence of these acids is particularly significant since they can lower the pH level of the process fluid, making it more aggressive towards the metal of the reboiler. This issue highlights the importance of regular monitoring and maintenance to identify any changes in chemical composition that may lead to the formation of corrosive agents.

The other factors listed can contribute to overall wear and tear on pressure vessels, but the formation of acids from hot process materials is a more direct cause of significant corrosion in the context of reboilers. High pressure conditions, for example, may affect the mechanical integrity of a pressure vessel but do not directly produce corrosive materials. Frequent temperature cycling can indeed cause thermal strains and fatigue but is less likely to be