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 0.125API 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 0.125