Analysis on Leakage Reason of Fin Tube for Air Cooler

The leakage happened on the fin tube for air cooler in gas regenerator.By means of chemical composition analysis,metallographic examination,fracture analysis,X-ray diffraction analysis and so on,the leakage reason of fin tube was dissected.The results showed that the corrosive medium was contained in natural gas,the acidic water appeared on the inner surface of fin tube under the operating conditions owing to the existing of CO2,which resulted in the corrosion thinning for fin tube.There was corrosion pore appeared on the thinner area of fin tube on account of the higher partial pressure of CO2,which resulted in the leakage.