api 5000Refer API 6a 6b And 6bx Flanges Weht Chart According to ASME B16.5 And (American Petroleum Institute) API 6A 5000 Flange Dimensions. Api 6a Flange Material Specification.API - ANSI Flange Conversation Chart - Free download as PDF File (.pdf), Text File (.txt) or read on for free. The document is a flange conversion chart that lists: - Nominal pipe size