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首页> 外文会议>International symposium on fire investigation science and technology >FUEL GAS LEAKAGE POTENTIAL FROM COMMON THREADED PIPE CONNECTIONS - CONSIDERATIONS FOR FIRE/EXPLOSION INVESTIGATIONS
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FUEL GAS LEAKAGE POTENTIAL FROM COMMON THREADED PIPE CONNECTIONS - CONSIDERATIONS FOR FIRE/EXPLOSION INVESTIGATIONS

机译：燃料气体泄漏潜力来自普通螺纹管连接 - 火灾/爆炸调查的注意事项

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Fire Explosion Investigations involving fuel gas explosions and flash fires in buildings often involve the examination of the complete indoor gas piping system, per NFPA 921i guidance. This often includes the examination of threaded piping connections for integrity. Unfortunately, many connections may degrade during exposure to the heat of fire or may be mechanically damaged from physical forces encountered during structural collapse and explosions. Some connections may appear to be loose, corroded; some may be broke at threads or at other portions of piping. Where portions of the piping system are intact, it is often desired to test them for leakage. This paper summarizes efforts to estimate maximum potential fuel gas leak rates from threaded pipe connections without subjecting the piping components to a pressure test. It has been shown that in some limited cases, piping connections and segments can be eliminated from consideration, where supporting data (from experimental leak tests at typical service pressures) indicate potential leakage is very small. Only common American residential threaded pipe sizes are considered in this paper (e.g. 3/8”, ?”, ?”, 1”), which do not correlate well with standard SI pipe sizes. Also, different considerations should be utilized for other common mechanical connections found in gas piping installations, e.g. flare, compression, etc. This paper is intended to generally apply to building gas systems downstream from gas service connections. However, it may have some application to utility distribution piping where installed above ground.
机译：涉及燃料气体爆炸和建筑物中闪光火灾的防火爆炸调查往往涉及每个NFPA 921i指导检查完整的室内燃气管道系统。这通常包括检查螺纹管道连接的完整性。遗憾的是，许多连接在暴露于火热中可能会降低，或者可以从结构崩溃和爆炸期间遇到的物理力机械损坏。一些连接可能看起来松动，腐蚀;有些人可能会在螺纹或在其他部件的管道处破裂。在管道系统的部分完好的情况下，通常希望测试它们进行泄漏。本文总结了努力估计螺纹管连接的最大潜在燃料泄漏率，而无需对管道部件进行压力测试。已经表明，在一些有限的情况下，可以从考虑因素消除管道连接和段，其中支持数据（从典型的维修压力下的实验泄漏测试）表示潜在的泄漏非常小。本文仅考虑普通的美国住宅螺纹管尺寸（例如3/8“，？”，？“，1”），其与标准SI管道尺寸不合适。此外，应使用不同的考虑因素用于在燃气管道装置中发现的其他常见机械连接，例如，耀斑，压缩等。本文旨在通常适用于在燃气服务连接下游的建筑气体系统。但是，它可能有一些应用于安装在地上的公用设施分配管道。

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