1.1 本试验方法描述了通过暴露于氯化水来评价用于冷水供应或服务系统的聚乙烯（PE）的长期氯化水抗氧化性的一般要求。该测试方法概述了加压流通测试系统的要求、典型测试压力、测试流体特性、故障类型和数据分析。 附注1: 其他已知的消毒系统（二氧化氯、臭氧和氯胺）目前用于保护饮用水；然而，游离氯是目前最常用的系统。除氯以外的消毒系统尚未通过该方法进行评估。 1.2 通过PE管的先前测试，已经建立了测试温度、测试环向应力和其他测试标准的指南和要求。通常出现在PE冷水供应或服务系统中的其他相关系统部件可以用PE管道进行评估。当将PE管道和配件作为一个系统进行测试时，建议将预期的最终用途配件类型和材料包括在测试回路中，因为已知某些配件类型和材料会影响故障时间。所用样品应代表所研究的管道产品和材料。 附注2: 该测试方法中描述的程序（对测试温度或应力或两者进行了一些修改）已用于评估由聚丁烯（PB）、交联聚乙烯（PEX）、聚丙烯（PP）、多层（聚合物-金属复合材料）、铜和不锈钢制造的管道。 1.3 本试验方法适用于用于输送含有游离-消毒用氯。本测试方法中规定的测试流体的氧化电位超过了美国饮用水系统中通常发现的氧化电位。 1.4 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。 1.5 以下注意事项仅适用于试验方法部分，章节 12 ，本说明书的。 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。1.6 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》中确立的国际公认的标准化原则制定的。 ======意义和用途====== 5.1 根据本试验方法得出的环境或氧化失效时间数据，根据第节进行分析 13 ，适用于外推到典型的最终使用温度和环向应力。外推值提供了测试PE管道或系统在与获得测试数据的条件相当的条件下对氯化水的氧化作用的抵抗力的相对指示。材料或管道产品在实际安装和使用条件下的性能取决于许多因素，包括安装方法、使用模式、水质、nat实际运行的冷水供应或服务系统的局部应力和大小，以及本试验方法中未涉及的其他变量。因此，外推值不构成具有给定外推失效时间值的PE管道或系统在实际使用条件下将在该时间段内执行的表示。 5.2 该测试方法通常用于评估氧化诱导的II期或III期失效数据。

1.1 This test method describes the general requirements for evaluating the long-term, chlorinated water, oxidative resistance of polyethylene (PE), used in cold water supply or service systems by exposure to chlorinated water. This test method outlines the requirements of a pressurized flow-through test system, typical test pressures, test-fluid characteristics, failure type, and data analysis. Note 1: Other known disinfecting systems (chlorine dioxide, ozone, and chloramine) are currently used for protection of potable water; however, free-chlorine is by far the most common system in use today. Disinfecting systems other than chlorine have not been evaluated by this method. 1.2 Guidelines and requirements for test temperatures, test hoop stresses, and other test criteria have been established by prior testing of PE pipe. Other related system components that typically appear in a PE cold water supply or service system can be evaluated with the PE pipe. When testing PE pipe and fittings as a system, it is recommended that the anticipated end-use fitting type(s) and material(s) be included in the test circuit since it is known that some fitting types and materials can impact failure times. Specimens used shall be representative of the piping product(s) and material(s) under investigation. Note 2: The procedures described in this test method (with some modifications of test temperatures or stresses, or both) have been used to evaluate pipes manufactured from polybutylene (PB), crosslinked polyethylene (PEX), polypropylene (PP), multilayer (polymer-metal composite), copper, and stainless steel. 1.3 This test method is applicable to PE pipe and systems used for transport of potable water containing free-chlorine for disinfecting purposes. The oxidizing potential of the test-fluid specified in this test method exceeds that typically found in potable water systems across the United States. 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 The following precautionary caveat pertains only to the test method portion, Section 12 , of this specification. 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 Environment or oxidative time-to-fail data derived from this test method, analyzed in accordance with Section 13 , are suitable for extrapolation to typical end-use temperatures and hoop stresses. The extrapolated value(s) provides a relative indication of the resistance of the tested PE pipe or system to the oxidative effects of chlorinated water for conditions equivalent to those conditions under which the test data were obtained. The performance of a material or piping product under actual conditions of installation and use is dependent upon a number of factors including installation methods, use patterns, water quality, nature and magnitude of localized stresses, and other variables of an actual, operating cold water supply or service system that are not addressed in this test method. As such, the extrapolated values do not constitute a representation that a PE pipe or system with a given extrapolated time-to-failure value will perform for that period of time under actual use conditions. 5.2 This test method has been generally used for evaluating oxidatively induced Stage II or Stage III failure data.