API 591 REDLINE : 2008

1 Scope
2 Normative References
3 Terms and Definitions
4 Purchaser Responsibilities and Recommended Actions
5 Manufacturer Quality Management System Evaluation
6 Valve Qualification
7 Post Qualification
Annex A (informative) - Suggested Selection Quantities
        for Examination and Test of Valves Made in
        Accordance with API Valve Standards
Annex B (normative) - Strength Tests for Stem
        Shaft-to-closure Element Connections
Annex C (informative) - Suggested Minimum Acceptable
        Casting Radiographic Results for Wall
        Thickness <= 50 mm (2 in.)

Describes recommendations for evaluation of a manufacturer's valve construction and quality management system for the purpose of determining a manufacturer's capability to provide new valves manufactured in accordance with the applicable standards.