弹性密封件.输送气体燃料和烃类流体的管道和配件用密封件的材料要求

[中文适用范围]： 本文件规定了供应管道和配件、辅助设备和阀门密封件中使用的弹性材料的要求，工作温度一般为 –5 °C 至 50 °C，特殊情况下为 –15 °C 至 50 °C， a) 一般应用（见表 4，G 系列）： ——气体燃料 [气相的人造、天然和液化石油气 (LPG)]， — 芳香族含量高达 30% 的碳氢化合物流体（通过体积），包括液相液化石油气； b) 特殊应用（见表 4，H 型）： ——适合运载含有气体冷凝物的气体燃料和芳烃含量不受限制的碳氢化合物流体的材料。 还给出了成品接头密封件的一般要求；特定应用所要求的任何附加要求均在相关产品标准中规定，同时考虑到管接头的性能是密封材料特性、密封几何形状和管接头设计的函数。 本文件在适当的情况下与规定接头性能要求的产品标准一起使用。 本文件适用于所有管道材料的接头密封件，包括铁、钢、铜和塑料。 对于复合密封圈，5.2.8 和 5.2.9 中的要求仅适用于用于任何弹性部件的材料与气态燃料或碳氢化合物流体接触的情况。 硬度等级 80 和 90 的材料的断裂伸长率、拉伸强度、压缩形变和应力松弛要求仅适用于构成直接参与密封功能或直接有助于长期稳定性的密封部分的情况。 本文件不适用于以下各项： ——由多孔材料制成的密封件； ——设计中带有封闭空隙的密封件； ——密封件要求耐火或耐热应力； ——包含连接预硫化型材端部的接头的密封件。 [外文原描述]： This document specifies requirements for elastomeric materials used in seals for supply pipes and fittings, ancillaries and valves at operating temperatures in general from ?5 °C up to 50 °C and in special cases from ?15 °C up to 50 °C, for the following: a) general applications (see Table 4, type G series): — gaseous fuel [manufactured, natural and liquefied petroleum gas (LPG) in the gaseous phase], — hydrocarbon fluids with an aromatic content up to 30 % (by volume), including LPG in the liquid phase; b) special applications (see Table 4, type H): — materials suitable for carrying gaseous fuels containing gas condensates and hydrocarbon fluids of unrestricted aromatic content. General requirements for finished joint seals are also given; any additional requirements called for by the particular application are specified in the relevant product standards, taking into account that the performance of pipe joints is a function of the seal material properties, seal geometry and pipe joint design. This document is used where appropriate with product standards which specify performance requirements for joints. This document is applicable to joint seals for all pipeline materials, including iron, steel, copper and plastics. In the case of composite sealing rings, the requirements in 5.2.8 and 5.2.9 apply only when the materials used for any elastomeric parts come into contact with gaseous fuel or hydrocarbon fluid. Elongation at break, tensile strength , compression set and stress relaxation requirements for materials of hardness classes 80 and 90 apply only when they constitute that part of the seal which participates directly in the sealing function or contributes directly to long-term stability. This document is not applicable to the following: — seals made from cellular materials; — seals with enclosed voids as part of their design; — seals required to be resistant to flame or to thermal stress; — seals which contain splices joining pre-vulcanized profile ends.