1.1 本规范涵盖了轴向无约束的承插式垫片接头，包括机器制造的“玻璃纤维”（玻璃纤维增强热固性树脂）管道系统所需的联轴器，8英寸（200毫米）至156英寸（4000毫米），使用柔性弹性体密封件以获得坚固性。管道系统包括用于水或化学品或气体的压力（通常高达250psi）或非压力系统，这些系统对本规范中规定的材料无害。本规范涵盖了材料、尺寸、测试要求和测试方法。 1.2 以英寸-磅单位表示的值应被视为标准值。括号中给出的值仅供参考。 注1: 有一个类似但技术上不同的ISO标准（ISO 8639）。 1.3 本标准并不旨在解决与其使用相关的所有安全问题（如果有的话）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。

1.1 This specification covers axially unrestrained bell-and-spigot gasket joints including couplings required for machine-made “fiberglass” (glass-fiber-reinforced thermosetting-resin) pipe systems, 8 in. (200 mm) through 156 in. (4000 mm), using flexible elastomeric seals to obtain soundness. The pipe systems include pressure (typically up to 250 psi) or nonpressure systems for water or for chemicals or gases that are not deleterious to the materials specified in this specification. This specification covers materials, dimensions, test requirements, and methods of test. 1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are provided for information purposes only. Note 1: There is a similar but technically different ISO Standard (ISO 8639). 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.