1.1 本试验方法包括通过评估通过测试管道和配件的充水组件得出的配件失效试验数据，确定PVC管表40和80承插式配件的压力等级的程序。 1.2 除非数据近似于一条直线，否则在使用对数坐标计算时，不可能为该产品或产品样本指定压力等级。由于长期数据较低，表现出高分散性或向下曲线的数据将给出较低的外推值，当使用对数坐标计算时，外推值更为保守。此外，该下降曲线将显示为较高的分散度，如果不满足较低的置信水平限值，则应将数据归类为不适用数据。 （参见 注1 ) 注1: 该测试方法与测试方法中使用的测试方法相似 2837年 ，已用于建立塑料管材料的HDS约30年，是分配给塑料管的所有压力额定值的基础。 1.3 本试验方法涵盖的产品为符合规范的40或80号PVC模制管件 第2466页 或 2467年 . 1.4 使用该试验方法得出的压力额定值仅适用于与试验相同的管件。影响压力额定值的一些变量包括:管道尺寸、图案、模具设计、材料和成型条件。 1.5 以英寸-磅为单位的数值应视为标准值。括号中给出的值是对SI单位的数学转换，仅供参考，不被视为标准值。 1.6 用于获取配件故障数据的测试程序应符合测试方法章节中的描述 1598年 ，在第节中引用 6. 本测试方法。 1.7 本试验方法所涵盖的产品适用于73 °F。适当时，设计工程师必须考虑高温和液体与配件材料的化学兼容性的影响，并应用必要的设计因素。 1.8 本标准并不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建立适当的安全、健康和环境实践，并确定监管限制的适用性。 注2: 加压（压缩）空气或其他压缩气体含有大量储存的能量，如果系统因任何原因发生故障，这些能量会带来严重的安全隐患。 1.9 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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 4.1 当按照试验方法对组件进行试验时，建立配件长期压力额定值的程序从基于配件失效数据的回归线外推开始 1598年 使用73℃的水获得压力对失效时间的数据 浸没在水或空气环境中的组件的温度为°F。外推的方式是确定这些条件下的长期静水压力额定值。 4.2 压力设计依据通过考虑以下项目并根据 6.3 . 4.2.1 100 000小时的长期静水压力强度， 4.2.2 50年的长期静水压力强度 4.3 配件压力额定值可通过将压力设计基准（PDB）乘以适当的设计系数（DF）来计算。

1.1 This test method covers a procedure for establishing Pressure Rating for PVC schedule 40 and 80 socket-type fittings by evaluating fitting failure test data derived by testing water-filled assemblies of pipe and fittings. 1.2 Unless the data approximates a straight line, when calculated using log-log coordinates, it is not possible to assign a pressure rating to that product or sample of product. Data that exhibit high scatter, or a downward curve, due to low long term data, will give low extrapolated values that are more conservative when calculated using log-log co-ordinates. In addition, this downward curve will show as higher scatter, and where the lower confidence level limits are not met the data shall be classified as unsuitable. (See Note 1 ) Note 1: This test method is similar to that used in Test Method D2837 , which has been used for about 30 years to establish the HDS of plastic pipe materials and is the basis for all pressure ratings assigned to plastic pipes. 1.3 The products covered by this test method are schedule 40 or 80 molded PVC fittings that conform to Specifications D2466 or D2467 . 1.4 The pressure ratings developed using this test method applies only to fittings identical to the ones that were tested. Some variables that will affect the pressure rating are – pipe size, pattern, mold design, material, and molding conditions. 1.5 The values in inch-pound units are to be regarded as the standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.6 The testing procedure used to obtain the fitting failure data shall be as described in those sections of Test Method D1598 , that are referenced in Section 6 of this test method. 1.7 The products covered by this test method are intended for use in the distribution of pressurized liquids at 73 °F. When appropriate, the design engineer must consider the effects of elevated temperature and chemical compatibility of the liquid with the fitting material and apply necessary design factors. 1.8 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. Note 2: Pressurized (compressed) air or other compressed gases contain large amounts of stored energy which present serious safety hazards should a system fail for any reason. 1.9 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 The procedure for establishing the long-term pressure rating of fittings starts with an extrapolation of a regression line that is based on fitting failure data with respect to time, when assemblies are tested in accordance with Test Method D1598 . The pressure-versus time to failure data are obtained using water at 73 °F in assemblies that are immersed in a water or air environment. The extrapolation is made in such a manner that the long-term hydrostatic pressure rating is determined for these conditions. 4.2 The pressure design basis is determined by considering the following items and evaluating them in accordance with 6.3 . 4.2.1 Long-term hydrostatic pressure-strength at 100 000 h, 4.2.2 Long-term hydrostatic pressure-strength at 50 years 4.3 The fitting pressure rating may be calculated by multiplying the pressure design basis (PDB) by the appropriate design factor (DF).