包括2013年7月的附录1和2014年11月的附录2。本标准涵盖了储存需要制冷的液化气体的低压、地上、立式和圆柱形储罐系统。本标准规定了储罐系统的责任、储存概念的选择、性能标准、附件/附属物、质量保证、绝缘和调试的一般要求。本标准涵盖储存容量为800立方米（5000桶）及以上的储罐系统。储存的产品应为在环境温度和压力下处于气态的液体，需要制冷至低于5°C（40°F）以保持液相。储罐系统的最低设计温度为-198°C（-325°F），最大设计内部压力为50 kPa（7 psig），最大设计均匀外部压力为1。 包括75千帕（0.25磅/平方英寸）。所涵盖的储罐系统配置包括由金属、混凝土或金属/混凝土组合构成的一次液体和蒸汽安全壳，以及在需要时的二次液体安全壳。API 620附录Q或附录R涵盖了金属容器材料、设计、制造、检验、检验和测试。API 620的适用附录取决于这些附录中给出的设计金属温度和适用温度范围。

Includes Addendum 1, July 2013 and Addendum 2, November 2014This standard covers low pressure, aboveground, vertical, and cylindrical tank systems storing liquefied gases requiring refrigeration. This standard provides general requirements on responsibilities, selection of storage concept, performance criteria, accessories/appurtenances, quality assurance, insulation, and commissioning of tank systems.This standard covers tank systems having a storage capacity of 800 cubic meters (5000 bbls) and larger. Stored product shall be liquids which are in a gaseous state at ambient temperature and pressure and require refrigeration to less than 5 °C (40 °F) to maintain a liquid phase. Tank systems with a minimum design temperature of -198 °C (-325 °F), a maximum design internal pressure of 50 kPa (7 psig), and a maximum design uniform external pressure of 1.75 kPa (0.25 psig) are covered.The tank system configurations covered consist of a primary liquid and vapor containment constructed of metal, concrete, or a metal/concrete combination and, when required, a secondary liquid containment.Metallic container materials, design, fabrication, inspection, examination, and testing are covered in API 620 Appendix Q or Appendix R. The applicable appendix of API 620 depends on the design metal temperature and the applicable temperature ranges given in these appendices.