1.1 本规程涵盖了测量运输应用中初始静态密封压力的标准方法。 1.2 它使用压力指示膜（PIF），记录密封件与法兰界面的最大载荷印记。印记的强度将根据界面上和沿界面的负载而变化。 1.3 这些印记可用于确定垫片上的初始载荷是否足以实现密封。这些印记也可能指示正确的螺栓扭矩顺序。这些印记也可用于确定配合面波纹度或局部平整度是否符合垫片要求。PIF很少发现粗糙度，因为峰间波长太短。PIF非常善于发现波纹度（峰间>2.5mm）和局部平坦度凹陷。PIF提供了最大压力的近似值，并且没有考虑扭矩序列后接头的松弛。 如果需要松弛后的法兰载荷，则应使用其他涉及动态测量的方法。 1.4 本标准并不旨在解决与其使用相关的所有安全问题（如果有的话）。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。 1.5 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 这种做法是一种筛选工具，应与其他更精确的实时负载测量技术结合使用。 5.2 这种做法涵盖了PIF的使用，PIF在几个负载范围内都有。这种做法还包括使用手动或自动扫描设备读取指示的负载。 5.3 限制包括PIF可能扭结、扭曲或弯曲的应用。PIF不能承受高温、低温或流体老化，也不考虑螺栓、垫片材料或法兰扭曲的任何松弛，因为它只提供最大的压力。

1.1 This practice covers a standard means for measuring initial static sealing pressure in transportation applications. 1.2 It uses a pressure-indicating film (PIF) that will record the maximum load imprint of the seal-to-flange interfaces. The imprints will vary in intensity based on load across and along the interface. 1.3 These imprints can be used to determine if initial load on the gasket is adequate to attain a seal. These imprints may also indicate correct bolt torque sequence. These imprints may also be used to determine if the mating surface waviness or local flatness meets gasket requirements. Roughness is rarely found by PIFs because peak-to-peak wavelengths are too short. PIF is very good at finding waviness (peak to peak > 2.5 mm) and local flatness dips. PIFs provide an approximation of maximum pressures, and do not take into account relaxation of the joint after the torque sequence. Other methods involving dynamic measurement should be used if flange loading after relaxation is desired. 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 ====== 5.1 This practice is a screening tool and should be used in conjunction with other more accurate real-time load-measuring techniques. 5.2 This practice covers the use of PIF, which is available in several load ranges. This practice also covers the use of a manual or automatic scanning device to read indicated load. 5.3 Limitations include those applications in which the PIF may be kinked, twisted, or buckled. PIF does not withstand elevated temperature, low temperature, or fluid aging and does not take into account any relaxation of bolts, gasket materials, or flange twisting, as it provides only the maximum attained pressure.