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流体产生足够的蒸气的温度被称为“闪点”或“闪光灯”。测试“闪光灯”的产生：开放杯或ASTM D92，封闭杯或ASTM D93有两种常见技术。在这两种方法中，都会加热一个小杯中的样品，将点火器插入蒸气中，并记录蒸气“闪烁”的温度。
The basic difference between the Closed Cup and the Open Cup techniques is that the cup is concealed in the Closed Cup test, thus preventing the vapor from dissipating into the air, and making the concentrated vapor to directly vent into the ignition source. As there is no cover in the case of the Open Cup, it records higher results as the sample should be hotter to produce adequate vapor to compensate for the amount of vapor that gets dissipated into the air. Usually, the temperature of the Open Cup flashpoint is 20- 30°F greater than the Closed Cup flashpoint.
如何进行流体样本：修订的1分钟视频
运行系统中的闪点与火点
蒸气闪烁must not be mistaken as fire because only the accumulated vapor gets ignited; once the vapor is used up, the flash is over. Following are the criteria for burning of a thermal fluid:
- The thermal fluid must stay adequately hot to continuously produce vapor. This is called the Fire Point and is typically 30-40°F greater than the temperature of Open Cup flashpoint for a novel fluid.
- 点火源应位于蒸气云中。
- The system should be exposed to adequate air to assist the combustion but not so adequate to convert the vapor into smoke.
What Prevents the Majority of Leaks from Becoming Fires?
选项卡|传热液|热油技术变得容易
- Hot vapors generally react with air and generate smoke which is not ignitable, thus limiting the area in which ignition can take place.
- Organic传热液具有特定的热量和相对较低的密度，因此在暴露于空气时会迅速冷却，从而限制了泄漏周围产生的蒸气量。
- 通常，泄漏总是在空地中发生，在那里有足够的空气以与任何蒸气反应和冷却热流体。因此，空气是发生火灾的主要要求之一，实际上可以最大程度地减少大火的可能性。
由于闪点较低，在热流体系统中很少发生火灾。这一点得到了以下事实，即在FM 7-99的FM 7-99财产损失预防表中，有机和合成液中的闪光点仅引用一次。
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