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 size*Tolerances and ring gaskets are according to API 6A. Materials for API 6A Type 6B 5000 psi(34.5 MPa) Weld Neck RTJ Flange, API 6A 6B Weld Neck