GB 150.3 specifies the design requirements for the basic pressure parts of pressure vessels. This part is applicable to the design calculation of cylinders and spherical shells under internal pressure, cylinders and spherical shells under external pressure, head, openings and reinforcements, and flanges. This part provides the basic design requirements for the noncircular cross section vessel (Normative Appendix A), flat steel ribbon wound cylinders (Normative Appendix B), common hermetically sealed structures (Informative Appendix C) and structures of welding joints (Informative Appendix D). This part also provides the basic design requirements for the low temperature pressure vessels (Normative Appendix E).
