api188API 5L Welded Steel Pipes Technical Data of Pipes Conforming to API 5L mm Outside Diameter Mass of Plain End Pipe Standard Test Pressure 4½ 114.3 4.500 0.125Download 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 Chromatography