CGA E-3规定了管道压力不超过200 psi（1380 kPa）的焊接、切割和相关工艺中使用的可拆卸管道调节器和站出口上的连接。可拆卸连接是指在日常使用和服务中通常且容易接合或断开的连接。通过管螺纹、螺栓法兰等连接到管道或管道中的调节器不视为可拆卸的。因此，本标准不适用于以下情况:设备内置调节器，以便成为更大设备的组成部分；大容量调节器通常用于固定位置，并配有比本标准所涵盖的更大的入口配件；通过管螺纹、法兰等连接至管道的调节器。所有新管道安装应包括第5节规定的连接。本标准不妨碍在本标准生效日期之前制造的乙炔和液化石油气型连接件在使用中或在制造商或用户现场的库存中继续使用，前提是这些连接件可通过适当的CGA标记识别。 本标准有效期为本年2021年2月17日出版日期三年。本标准生效日期当天和之后的新乙炔和液化石油气管道安装应符合本标准。

CGA E-3 specifies the connections on removable pipeline regulators and station outlets used in the welding, cutting, and allied processes where the pipeline pressure does not exceed 200 psi (1380 kPa). Removable connections are those that are commonly and readily engaged or disengaged in routine use and service.A regulator connected to or in the pipeline by pipe threads, bolted flanges, etc., is not considered removable. Therefore, this standard does not apply to the following:regulators built into equipment so as to become an integral part of a larger device;high capacity regulators generally used in fixed locations and provided with inlet fittings larger than covered in this standard; andregulators attached to the pipeline by pipe threads, flanges, etc.All new pipeline installations shall incorporate the connections specified in Section 5.This standard does not prejudice the continued use of acetylene and LPG type connections in service or in inventory at a manufacturer's or user's site that were manufactured before the effective date of this standard provided the connections are identifiable with the appropriate CGA markings.The effective date of this standard is three years from the date of the publication of this edition, which was February 17, 2021. New acetylene and LPG pipeline installations on and after the effective date of this standard shall be in compliance with this standard.