1.1 本规程旨在定义涂层金属管道暴露于天气的条件。 1.2 本规程规定了样品的资格、暴露在天气中应遵循的程序以及评估暴露影响的程序，包括目视检查和其他测试。 1.3 以国际单位制表示的三位有效小数的数值将被视为标准。括号中给出的值仅供参考。 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。 1.5 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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 由于涂层管道在埋设之前可能会在室外长期存放，因此需要进行本规程中所述的风化试验，以评估室外存放的这些涂层的稳定性。所得结果应仅视为表明风化的一般影响。暴露条件每年都有很大变化，一年中的一段时间到另一段时间，以及不同地区。 如果在夏季开始接触，然后在冬季开始接触，则北方短期接触测试的结果更有意义。在全年气候条件较为均匀的南部地区，一年中开始短期暴露的时间并不那么关键。在所有地方，暴露时间越长，获得的结果越可靠。

1.1 This practice is intended to define conditions for the exposure of coated metal pipe to weather. 1.2 This practice specifies qualifications for the samples, procedure to be followed in exposure to weather, and procedure for evaluating effects of exposure including visual examination and other tests. 1.3 The values stated in SI units to three significant decimals are to be regarded as the standard. The values given in parentheses are for information only. 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 ====== 4.1 Since coated pipe may be stored outdoors for long periods before burial, weathering tests described in this practice are needed to evaluate the stability of these coatings stored outdoors. The results obtained should be treated only as indicating the general effect of weathering. Exposure conditions vary greatly from year to year, from one part of a year to another, and from locality to locality. The results of short-term exposure tests in the north are more meaningful if exposure is started in the summer followed by a winter season. In southern areas where climatic conditions are more uniform throughout the year, the time of year when short-term exposure is started is less critical. In all localities, the longer the exposure period, the more reliable are the results obtained.