1.1 本试验方法涵盖了在恒定内压下热塑性和增强热固性/树脂管道失效时间的测定。 1.2 本试验方法提供了一种在规定条件下表征管状塑料的方法。 1.3 以英寸-磅单位表示的值应被视为标准值。括号中给出的值是对SI单位的数学转换，仅供参考，不被视为标准。 1.4 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。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法规限制的适用性。1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（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，从中可以计算塑料管材料的流体静力学设计基础。（参见测试方法 D2837 和实践 D2992 .) 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个或更多对数十年时间（小时）内的应力-失效时间关系。由于试验和所用样本的性质，没有一条线可以充分代表数据，因此应建立置信限。 附注2: 一些材料通常在短失效时间内表现出对数应力和对数失效时间之间的非线性关系。在这种情况下，10 5 -基于短期测试数据计算的小时应力值可能与根据测试方法分布数据点时获得的值有显著差异 D2837 被评估。然而，如果已经建立了与长期数据的相关性，这些数据可能仍然对质量控制或其他应用有用。 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。该程序考虑了那些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 在决定管道是否失效时，蠕变或某些塑料制成的管道的不可恢复变形与实际泄漏一样重要。然而，表现出局部膨胀的试样可能导致对蠕变结果的错误解释，除非建立了排除这种可能性的确定蠕变的方法。样品上两个或三个选定位置的周向测量可能不够。 5.5 必须非常小心地确保样本代表被评估的管道。偏离这一假设可能会导致与偏离本试验方法中概述的程序细节导致的差异一样大（如果不是更大）。

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.