Thanks selmagis. Some very good info in this Guide with regard to:
EN 764-4, Pressure equipment – Part 4: Establishment of technical delivery conditions for metallic materials.
EN 10204, Metallic products
ISO 15649 Petroleum and natural gas industries – Piping.
Directive 97/23/EC
PED
Guidelines related to the application of the Pressure Equipment Directive 97/23/EC
European Pressure Equipment Directive
ANSI/ASME B31.3:1999, Process Piping (including ANSI/ASME B31.3a – 2000 Addenda).
ASME QAI-1:1998, Qualifications for Authorized Inspection.
EEMUA Publication 196, Valves Purchasers' Guide to the PED