What is sweet service in pipeline engineering?

Sweet service in pipeline engineering refers to the transportation of hydrocarbons, particularly natural gas and crude oil, that contains little to no hydrogen sulfide (H2S) or other corrosive compounds. This type of service is generally less corrosive and requires less stringent materials and maintenance standards compared to "sour service," which involves fluids that contain significant levels of hydrogen sulfide. Consequently, sweet service pipelines can often be constructed using standard carbon steel materials, making them more cost-effective and easier to manage. Proper classification between sweet and sour service is crucial for ensuring the safety and longevity of pipeline systems.