api188Download scientific diagram | Scheme of the labeling process to prepare the API, 188 Re-MN-16ET, from the precursor, protected-H 3 MN-16ET. from publication: Liquid ChromatographyAPI 5L X52 pipe also called L360 Pipe, named by minimum yield strength 52 Ksi (360 Mpa) in API 5L or ISO 3183 specifications, types in seamless, ERW, LSAW, SSAWHSAW.