第1部分:片状垫片的泄漏和排放特性:垫片的无组织排放特性研究了两种片状垫片材料（NBR/石棉片和金属增强柔性石墨片）在四种不同流体中的无组织排放特性:氦气、甲烷、丙烷和六氟化硫。还研究了中等温度暴露（350°F下5天）对垫圈密封性的影响。使用室温密封性试验（ROTT）程序和新开发的排放热运行密封性试验（EHOT）程序对4英寸NPS垫圈进行试验。 在试验过程中，使用压力衰减法或压力上升法测量垫片泄漏率。为了提高泄漏率计算的精度，开发并应用了偏离理想气体定律的修正。第2部分:片状垫片的泄漏和排放特性:柔性石墨和PTFE基片状垫片室温下泄漏稳定时间的探索性研究一种典型柔性石墨材料和一种膨胀PTFE的室温泄漏行为的停留时间效应- 通过在TTRL（RH试验台）提供的ROTT试验台上进行探索性泄漏试验，对基础产品进行了调查。根据“螺栓连接设计用垫片常数标准试验方法”第8号拟议ASTM方法草案中的建议，在1025和15160 psi之间的八种不同垫片应力水平下，以及两种气体压力（400和800 psig）下，测量了一段时间内的泄漏率氦质谱检漏仪已用于所有泄漏测量。每15分钟记录一次泄漏测量，每次应力/压力组合的最大时间为5小时。 泄漏测量允许的最短时间设置为2小时。根据最近三次泄漏测量确定了泄漏稳定标准:当计算的标准偏差小于这些测量平均值的2%时，假设泄漏稳定。进行了长期泄漏测量，以更好地检查应力和气体压力变化对泄漏稳定时间的影响。

Part 1: Leakage and Emission Characteristics of Sheet Gaskets: Fugitive Emission Characteristics of GasketsThe fugitive emission characteristics of two sheet gasket materials, an NBR/asbestos sheet and a metal-reinforced flexible graphite sheet, were investigated with four different fluids: helium, methane, propane and sulfur hexafluoride. The effect of a moderate temperature exposure (5 days at 350°F) on the gasket tightness was also studied. The tests were conducted on 4-inch NPS gaskets using the room temperature tightness test (ROTT) procedure and the newly developed emission hot operating tightness test (EHOT) procedure. During the tests, gasket leak rates were measured using either the pressure decay or the pressure rise methods. To improve the precision of the leak rate calculations, a correction for deviation from the ideal gas law was developed and applied.Part 2: Leakage and Emission Characteristics of Sheet Gaskets: Exploratory Investigation of the Leakage Stabilization Time at Room Temperature for Flexible Graphite and PTFE-Based Sheet GasketsThe dwell time effect on the room temperature leakage behavior of one typical flexible graphite material and one expanded PTFE-based product was investigated by performing exploratory leakage tests on the ROTT test rig available at TTRL (RH Rig). Leak rates over time have been measured at eight different gasket stress levels between 1025 and 15,160 psi, and for two gas pressures (400 and 800 psig) as recommended in the proposed ASTM Method Draft No 8 of the "Standard Test Method for Gasket Constants for Bolted Joint Design." The helium mass spectrometer leak detector has been used for all leak measurements. Leak measurements have been recorded every 15 minutes during a maximum time of 5 hours for each combination of stress/pressure. The minimum time allowed for leakage measurement has been set to 2 hours. A leakage stabilization criterion was defined on the basis of the last three leak measurements: the leak is assumed to be stabilized when the calculated standard deviation is less than 2% of the average of these measurements. Longer-term leakage measurements were preformed to better examine the effect of stress and gas pressure changes on the leak stabilization time.