api 5000API - 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 sizeThe inside diameter of a # API 6A 5000 PSI weld neck flange is machined to match the inside diameter of the pipe. Tesco Steel & Engineering manufacture a wide range of hh quality