The National Institute for Occupational Safety and Health conducted a study on leakage rates through underground coal mine seals. Leakage rates of coal bed gas into active workings have not been well established. New seal construction standards have exacerbated the knowledge gap in our understanding of how well these seals isolate active workings near a seal line. At a western US underground coal mine, we determined seal leakage rates ranged from about 0 to 0.036 m³/s for seven 340 kPa seals. The seal leakage rate varied in essentially a linear manner with variations in head pressure at the mine seals.

中文翻译：

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地下煤矿通过密封条泄漏率的研究。

美国国家职业安全与健康研究所对地下煤矿密封件的泄漏率进行了研究。尚未充分确定煤层气进入活跃作业的泄漏率。新的密封构造标准加剧了我们对这些密封如何隔离密封线附近的有效工作的理解的知识鸿沟。在美国西部的一个地下煤矿，我们确定了七个340 kPa的密封件的密封件泄漏率在大约0到0.036 m ³ / s的范围内。密封泄漏率基本上随着矿井密封处的头部压力的变化以线性方式变化。