API 920 : 1990

Section 1 - Selection of pressure vessel steels to
            prevent brittle fracture
1.1 Introduction
1.2 Purpose
1.3 General philosophy
1.4 Materials selection
1.5 Referenced publications
Section 2 - Toughness evaluation of existing pressure
            vessels
2.1 Introduction
2.2 Purpose
2.3 Scope
2.4 General philosophy
2.5 Criteria for service
2.6 Importance of condition
Appendix A - Hydrostatic testing
Appendix B - Steels
Appendix C - Inspection
Appendix D - Impact test exemption curves
Figure
D-1 Material curves
Table
D-1 Impact test exemption temperatures for bolting
     materials

Offers guidance in the selection of steels for new pressure vessels and in the inspection and operation of existing pressure vessels to minimize the probability of brittle fracture caused by low toughness at temperatures below 120 deg F. Coverage includes: selection of pressure vessel steels to prevent brittle fracture (features general philosophy and materials selection); toughness evaluation of existing pressure vessels (features general philosophy, criteria for service and importance of condition). Also gives detailed appendices.