I'm working on ball valves specifications and Our client spicify the following standards for fire tests ISO 10497 / API 607 and API 6FA.
I have just checked this standards and I found the qualifications of valves by nominal size aren't the same between ISO 10497 / API 607 and API 6FA;
- in ISO 10497 / API 607 all valves NPS>12" will be qualified by valve NPS 8,
- API 6FA valves the qualification is more d