§ 173.301a Additional general requirements for shipment of specification cylinders.
发布08-07
生效09-08
摘要总结AI 辅助解读
该法规（49 CFR § 173.301a）规定了在美国运输规格气瓶（specification cylinders）装运气体时的额外通用要求。核心内容包括：明确未标记服务压力的授权气瓶的默认压力值；严格限制气瓶在21°C和55°C下的最大允许压力，特别是针对危险区A/B类物质及乙炔等特定气体的例外规定；以及关于旧气瓶使用的“祖父条款”。生效日期为2026-09-08，相关从业者需核实气瓶充装压力是否符合最新温度与压力对应标准。
- (a) General. The requirements in this section are in addition to the requirements in § 173.301 and apply to the shipment of gases in specification cylinders.
- (b) Authorized cylinders not marked with a service pressure. For authorized cylinders not marked with a service pressure, the service pressure is designated as follows:
Specification marking Service Pressure psig 3 1800 3E 1800 8 250
- (c) Cylinder pressure at 21 °C (70 °F). The pressure in a cylinder at 21 °C (70 °F) may not exceed the service pressure for which the cylinder is marked or designated, except as provided in § 173.302a(b). For certain liquefied gases, the pressure at 21 °C (70 °F) must be lower than the marked service pressure to avoid having a pressure at a temperature of 55 °C (131 °F) that is greater than permitted.
- (d) Cylinder pressure at 55 °C (131 °F). The pressure in a cylinder at 55 °C (131 °F) may not exceed 5/4 times the service pressure, except:
- (1) For a cylinder filled with acetylene, liquefied nitrous oxide, or carbon dioxide.
- (2) For a cylinder filled in accordance with § 173.302a(b), the pressure in the cylinder at 55 °C (131 °F) may not exceed 5/4 times the filling pressure.
- (3) The pressure at 55 °C (131 °F) of Hazard Zone A and Hazard Zone B materials may not exceed the service pressure of the cylinder. Sufficient outage must be provided so that the cylinder will not be liquid full at 55 °C (131 °F).
- (e) Grandfather clause. A cylinder in domestic use prior to the date on which the specification for the cylinder was first made effective may be used if the cylinder has been properly tested and otherwise conforms to the requirements applicable to the gas with which it is charged.
[67 FR 51645, Aug. 8, 2002, as amended at 67 FR 61289, Sept. 30, 2002; 68 FR 24661, May 8, 2003; 76 FR 56317, Sept. 13, 2011]