1.1 恒定拉伸载荷接头试验（CTLJT）旨在证明塑料管道系统中的接头能够抵抗长期蠕变的影响。 1.1.1 接头承受至少等于其工作压力的内部压力和持续轴向拉伸载荷，持续时间为指定时间段，通常为1000小时。接头不得泄漏，管道也不得泄漏 彻底地 在测试期间退出。总轴向应力由参考文件设定。 1.1.2 聚乙烯管接头测试的一些典型条件如 附录X1 . 1.2 该测试通常在73时进行 华氏度（22.8 °C）。 1.3 开发CTLJT是为了证明聚乙烯气管上机械接头的长期抗拔性能。 CTLJT也已成功应用于塑料管道系统其他部件的评估。这些应用在中进行了讨论 附录X1 . 1.4 以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 本试验方法旨在验证设计用于塑料天然气管道系统的接头的长期抗拔力。 5.2 除了OPS第192.283b部分第49篇要求的短期试验外，还使用了本试验方法。制造商和公用事业公司使用本试验方法的非正式版本，以证明接头能够抵抗长期蠕变的影响，并符合规范规定的1类或3类接头分类要求 D2513 . 5.3 本试验方法也适用于确定持续轴向载荷对设计用于其他应用的塑料管道系统接头或其他部件的影响。 试验参数和内部加压流体（如有）应在参考文件中列出。 5.4 对于接头以外的产品，参考本试验方法的文件应规定试验条件和性能要求。一般来说，如果这些产品在测试期间和之后保持其结构完整性、不泄漏并且性能符合规范，则这些产品通过了该测试。

1.1 The constant tensile load joint test (CTLJT) is designed to demonstrate that a joint in a plastic piping system is resistant to the effects of long-term creep. 1.1.1 The joint is subjected to an internal pressure at least equal to its operating pressure and a sustained axial tensile load for a specified time period, usually 1000 h. The joint shall not leak, nor may the pipe completely pull out for the test duration. The total axial stress is set by the referencing document. 1.1.2 Some typical conditions for testing of joints on polyethylene pipe are described in Appendix X1 . 1.2 This test is usually performed at 73 °F (22.8 °C). 1.3 The CTLJT was developed to demonstrate the long-term resistance to pullout of mechanical joints on polyethylene gas pipe. The CTLJT has also been successfully applied to the evaluation of other components of plastic piping systems. These applications are discussed in Appendix X1 . 1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.5 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. 1.6 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. ====== Significance And Use ====== 5.1 This test method was designed to be used to validate the long-term resistance to pullout of joints designed for use in plastic natural gas piping systems. 5.2 This test method is used in addition to the short-term tests required by OPS Part 192.283b, Title 49. Informal versions of this test method are used by manufacturers and utilities to demonstrate that a joint is resistant to the effects of long-term creep and meets the requirements for classification as a Category 1 or a Category 3 joint in accordance with Specification D2513 . 5.3 This test method may also be applicable for the determination of the effects of a sustained axial load on joints or other components of plastic piping systems designed for other applications. Test parameters and the internal pressurizing fluid, if any, should be listed in the referencing document. 5.4 Documents that reference this test method for products other than joints shall specify test conditions and performance requirements. In general, such products pass this test if they maintain their structural integrity, do not leak, and perform to specification during and after the test.