1.1 本规程建立了两个程序，即程序A（循环）和程序B（静态），用于通过评估强度回归数据来获得玻璃纤维管道产品的静水压设计基础（HDB）或压力设计基础（PDB），这些数据来源于测试相同材料和结构的管道或配件，或两者，无论是单独测试还是组合测试。玻璃纤维增强热固性树脂管（RTRP）和玻璃纤维增强聚合物砂浆管（RPMP）均为玻璃纤维管。 注1: 就本标准而言，聚合物不包括天然聚合物。 1.2 这种做法可用于玻璃纤维管外径与壁厚之比为10:1或更大的HDB测定。 注2: 这种基于薄壁管道设计理论的限制进一步限制了这种做法对内部压力的应用，通过环向应力方程，内部压力约为推导的静水压设计应力（HDS）的20%。 例如，如果HDS为5000磅/平方英寸（34 500千帕），则无论直径如何，管道的内部压力都限制在约1000磅/平方毫米（6900千帕）。 注3: 如果有意放置长（连续）玻璃纤维以抵抗计划的压力负载情况（即自由端压力测试和654.7°玻璃绕组），当同一管道在正常管道应用中典型的较低（无损伤）应力下运行时，这种做法的结果在预测长期玻璃管性能时可能过于保守。 注4: 分析中的所有数据点应具有相同的故障模式。如果树脂基体意外开裂或其他意外失效模式排除了导致管道失效的树脂塑性蠕变，则这种做法可能无法准确表示管道的预期寿命。 1.3 该实践为复杂形状的产品或系统提供了PDB，其中复杂的应力场严重抑制了环向应力的使用。 1.4 基础试验方法中的试样端部封闭可能是受约束的，也可能是自由的，从而导致某些限制。 1.4.1 限制端-- 试样仅在环向上受到内压的应力，HDB适用于仅在环向上产生的应力。 1.4.2 自由端-- 试样在环向和纵向都受到内压的应力，因此环向应力是纵向应力的两倍。这种做法可能不适用于评估纵向应力超过HDS 50%的载荷引起的应力。 1.5 以英寸磅为单位的数值应视为标准。括号中的值仅供参考。 注5: 目前还没有与该标准等效的ISO。 1.6 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。 1.7 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 这种做法有助于在模拟实际预期产品最终使用条件的选定内部和外部环境下建立环向应力或内部压力与失效时间的关系，从而获得特定管道产品和材料的设计基础。本规程定义了可轻松计算环向应力的直、空心圆柱形材料的HDB，以及应力更复杂的配件和接头的PDB。 5.1.1 基于初始应变与时间的替代设计实践- 失效关系采用应变基HDB而不是本实践定义的应力基HDB。基于应变的HDB最常用于内压范围为0至250 psig（1.72 MPa）的埋地管道设计。 5.2 为了表征玻璃纤维管道产品，有必要在受控的环境参数内建立三个或三个以上对数几十年时间（周期或小时）内的应力与循环或失效时间、压力与循环或故障时间的关系。由于测试和所用样本的性质，没有一条线能够充分代表数据。因此，应确定置信限。 5.3 如果试样和相关管道使用相同的特定工艺和材料，则可以使用通过测试一种尺寸的管道确定的HDS来计算每个温度下各种尺寸管道的压力额定值。 5.4 可使用通过测试一种尺寸的管道确定的HDP来计算除直空心形状外的部件在每个温度下的压力额定值，前提是( 1. )用于试样的特定材料和制造工艺用于部件( 2. )对于接头，用于制备试样的连接材料和程序用于现场连接，以及( 3. )关键尺寸的缩放与部件的直径和压力额定值有关。 注10: 配件和接头的缩放应根据试验方法通过短时试验进一步验证 D1599 . 5.5 在一组环境条件下获得的结果不得用于其他条件，但较高的温度数据可用于较低应用温度的设计基准分配。应确定每种特定管道产品的设计依据。设计和加工会显著影响- 管道产品的长期性能，因此在任何评估过程中都应予以考虑。 5.6 这种做法只适用于给定的管道或配件，只要样品能真正代表该材料和制造工艺。 5.6.1 如第节所述，材料或制造工艺的变化将需要重新评估 12 .

1.1 This practice establishes two procedures, Procedure A (cyclic) and Procedure B (static), for obtaining a hydrostatic design basis (HDB) or a pressure design basis (PDB) for fiberglass piping products, by evaluating strength-regression data derived from testing pipe or fittings, or both, of the same materials and construction, either separately or in assemblies. Both glass-fiber-reinforced thermosetting-resin pipe (RTRP) and glass-fiber-reinforced polymer mortar pipe (RPMP) are fiberglass pipe. Note 1: For the purposes of this standard, polymer does not include natural polymers. 1.2 This practice can be used for the HDB determination for fiberglass pipe where the ratio of outside diameter to wall thickness is 10:1 or more. Note 2: This limitation, based on thin-wall pipe design theory, serves further to limit the application of this practice to internal pressures which, by the hoop-stress equation, are approximately 20 % of the derived hydrostatic design stress (HDS). For example, if HDS is 5000 psi (34 500 kPa), the pipe is limited to about 1000-psig (6900-kPa) internal pressure, regardless of diameter. Note 3: Where long (continuous) glass fibers are intentionally placed to resist the planned pressure load case (that is, free end pressure testing and 654.7° fiberglass windings) the results from this practice may be overly conservative in predicting long term fiberglass pipe performance when the same pipe is operated at lower (non-damaging) stresses typical in normal pipeline applications. Note 4: All data points in the analysis shall be of the same failure mode. Where plastic creep of the resin leading to pipe failure is precluded by unintended resin matrix cracking or other unanticipated modes of failure, this practice may not accurately represent the pipe’s life expectancy. 1.3 This practice provides a PDB for complex-shaped products or systems where complex stress fields seriously inhibit the use of hoop stress. 1.4 Specimen end closures in the underlying test methods may be either restrained or free, leading to certain limitations. 1.4.1 Restrained Ends— Specimens are stressed by internal pressure only in the hoop direction, and the HDB is applicable for stresses developed only in the hoop direction. 1.4.2 Free Ends— Specimens are stressed by internal pressure in both hoop and longitudinal directions, such that the hoop stress is twice as large as the longitudinal stress. This practice may not be applicable for evaluating stresses induced by loadings where the longitudinal stress exceeds 50 % of the HDS. 1.5 The values stated in inch-pound units are to be regarded as the standard. The values in parentheses are given for information purposes only. Note 5: There is no known ISO equivalent to this standard. 1.6 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. 1.7 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 This practice is useful for establishing the hoop stress or internal pressure versus time-to-failure relationships, under selected internal and external environments which simulate actual anticipated product end-use conditions, from which a design basis for specific piping products and materials can be obtained. This practice defines an HDB for material in straight, hollow cylindrical shapes where hoop stress can be easily calculated, and a PDB for fittings and joints where stresses are more complex. 5.1.1 An alternative design practice based on initial strain versus time-to-failure relationships employs a strain basis HDB instead of the stress basis HDB defined by this practice. The strain basis HDB is most often used for buried pipe designs with internal pressures ranging from 0 to 250 psig (1.72 MPa). 5.2 To characterize fiberglass piping products, it is necessary to establish the stress versus cycles or time to failure, or pressure versus cycles or time to failure relationships over three or more logarithmic decades of time (cycles or hours) within controlled environmental parameters. Because of the nature of the test and specimens employed, no single line can adequately represent the data. Therefore, the confidence limits shall be established. 5.3 Pressure ratings for piping of various dimensions at each temperature may be calculated using the HDS determined by testing one size of piping provided that the same specific process and material are used both for test specimens and the piping in question. 5.4 Pressure ratings at each temperature for components other than straight hollow shapes may be calculated using the HDP determined by testing one size of piping provided that ( 1 ) the specific materials and manufacturing process used for the test specimens are used for the components, ( 2 ) for joints, the joining materials and procedures used to prepare the test specimens are used for field joining, and ( 3 ) scaling of critical dimensions is related to diameter and pressure rating of the component. Note 10: Scaling of fittings and joints should be further verified by short-time testing in accordance with Test Method D1599 . 5.5 Results obtained at one set of environmental conditions shall not be used for other conditions, except that higher temperature data can be used for design basis assignment for lower application temperatures. The design basis shall be determined for each specific piping product. Design and processing can significantly affect the long-term performance of piping products, and therefore shall be taken into consideration during any evaluation. 5.6 This practice is valid for a given pipe or fitting only so long as the specimens are truly representative of that material and manufacturing process. 5.6.1 Changes in materials or manufacturing processes will necessitate a reevaluation as described in Section 12 .