1.1 本试验方法包括在恒定内压下测定热塑性和增强热固性/树脂管的失效时间。 1.2 本试验方法提供了一种在规定条件下表征管道形式塑料的方法。 1.3 以英寸磅为单位的数值应视为标准。括号中给出的值是国际单位制的数学转换，仅供参考，不被视为标准。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 1.5 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。 ====意义和用途====== 5.1 通过该试验方法获得的数据有助于在受控环境中建立应力与失效时间的关系，从而可以计算塑料管材料的静水压设计基础。（参考试验方法 1837年2月 和实践 1992年2月 .） 5.2 为了确定塑料作为管道的性能，有必要在受控环境中建立管道在2个或更多对数几十年（小时）内的应力-失效时间关系。由于所用试验和试样的性质，没有一条线能够充分代表数据，因此应确定置信限。 注2: 一些材料在对数应力和对数失效时间之间可能表现出非线性关系，通常在短失效时间内。在这种情况下 5. -基于短期试验数据计算的小时应力值可能与根据试验方法进行数据点分布时获得的值显著不同 1837年2月 评估。然而，只要已经建立了与长期数据的相关性，这些数据仍然可以用于质量控制或其他应用。 5.3 影响塑料管蠕变和长期强度行为的因素目前还不完全清楚。该程序考虑了已知具有重要影响的因素，并为调查其他因素提供了工具。 5.4 蠕变，或某些塑料制成的管道的不可恢复变形，在决定管道是否失效时，与实际泄漏一样重要。然而，表现出局部膨胀的试样可能会导致对蠕变结果的错误解释，除非确定蠕变的方法排除了这种可能性。在试样上两个或三个选定位置进行周向测量可能不够。 5.5 必须非常小心地确保试样能够代表所评估的管道。 偏离这一假设可能会导致与本试验方法中概述的程序细节偏离一样大的差异，如果不大于这些差异的话。

1.1 This test method covers the determination of the time-to-failure of both thermoplastic and reinforced thermosetting/resin pipe under constant internal pressure. 1.2 This test method provides a method of characterizing plastics in the form of pipe under the conditions prescribed. 1.3 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. 1.4 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. 1.5 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 The data obtained by this test method are useful for establishing stress versus failure time relationships in a controlled environment from which the hydrostatic design basis for plastic pipe materials can be computed. (Refer to Test Method D2837 and Practice D2992 .) 5.2 In order to determine how plastics will perform as pipe, it is necessary to establish the stress-failure time relationships for pipe over 2 or more logarithmic decades of time (hours) in a controlled environment. Because of the nature of the test and specimens employed, no single line can adequately represent the data, and therefore the confidence limits should be established. Note 2: Some materials may exhibit a nonlinear relationship between log-stress and log-failure time, usually at short failure times. In such cases, the 10 5 -hour stress value computed on the basis of short-term test data may be significantly different than the value obtained when a distribution of data points in accordance with Test Method D2837 is evaluated. However, these data may still be useful for quality control or other applications, provided correlation with long-term data has been established. 5.3 The factors that affect creep and long-term strength behavior of plastic pipe are not completely known at this time. This procedure takes into account those factors that are known to have important influences and provides a tool for investigating others. 5.4 Creep, or nonrecoverable deformation for pipe made of some plastics, is as important as actual leakage in deciding whether or not a pipe has failed. Specimens that exhibit localized ballooning, however, may lead to erroneous interpretation of the creep results unless a method of determining creep is established that precludes such a possibility. Circumferential measurements at two or three selected positions on a specimen may not be adequate. 5.5 Great care must be used to ensure that specimens are representative of the pipe under evaluation. Departure from this assumption may introduce discrepancies as great as, if not greater than, those due to departure from details of procedure outlined in this test method.