Abstract:
Regeneration gas cooling and heating system installed in oil and gas processing plant plays a crucial role in removal of carbon dioxide (CO2) and hydrogen sulfide (H2S), from natural gas streams. The commingled flow of gases received from different wells in oil and gas exploration contains H2S, which poses a risk to the regeneration heating and cooling system. Analysis of hydrogen sulfide (H2S) corrosion and prevention measures is essentially required in the regeneration gas cooling and heating system including the feed and return lines. To evaluate the structural strength and susceptibility to H2S corrosion in regeneration gas heating and cooling system, a combination of conventional and advanced nondestructive testing methods is used. Non-destructive testing reports are analyzed according to internationally recognized codes and standards such as API-510 and ASME Sec VIII DIV 1.These assessments determine corrosion rates, remaining lifespan of the equipment, minimum thickness requirements, and maximum operating pressure. Recommendations are provided for the mitigation of H2S corrosion, including the selection of chemical treatments such as H2S scavengers and inhibition programs, pH control chemicals, installation of corrosion monitoring tools and post-weld heat treatments. Stress corrosion cracking (SSC) is a type of damage that occurs when certain metals are exposed to stress, corrosion, water, and hydrogen sulfide (H2S). To prevent SSC in several types of steels, it is important to use a process called post-weld heat treatment (PWHT). PWHT reduces hardness and stress in the metal, which helps lower the risk of SSC. Certain welding techniques can also increase the chance of SSC because of heat affected zone (HAZ). The results of this research align closely with published data and offer an effective procedure for analysis of H2S corrosion in the regeneration gas cooling and heating system and provides preventive measures against anticipated H2S damage mechanism. The proposed procedure is a significant improvement in addressing H2S corrosion problems and provides a more realistic solution for industrial applications to reduce downtime, production loss and loss of human life.
