API RP 5C6 pdf download Welding Connections to Pipe 3Definitions and Abbreviations 3.1alignment: Refer to Section 8 of this document.3.2APl: Amcrican Petroleum Institute. 3.3ASME: American Society for Mechanical Engineers.3.4ASTM: American Society for Testing and Materials.3.5AWS: American wWelding Socicty. 3.6 axial alignment: Alignment to within specified tolerances of the connector centerline, to the centerline of the connector atthe opposite end of...