Recognize the potential for heat-transfer-fluid mist explosions
- Factory Mutual Research Corp., Norwood, MA (United States)
Engineers generally recognize the fire and explosion hazards of low-flash-point flammable liquids. However, they often fail to recognize that similar hazards exist with high-flash-point materials operating above their flash points. One of the most common uses of high-flash-point liquids above the flash point is heat-transfer fluids (HTFs) in heat-transfer systems. While explosions involving HTF systems are not common, they can, and do, occur. An HTF system operating above its boiling point can create an explosion hazard if it leaks and releases vapor or superheated liquid into an enclosed area. When released vapor partly condenses into a fine mist, or when a superheated liquid is released and flashes to produce a vapor or a liquid mist, an explosion can result. An HTF system operating below the fluid`s boiling point is less hazardous because it usually operates at lower pressure, decreasing the likelihood that a fine mist will be produced. This article reviews an incident that illustrates the consequences of not recognizing the explosion hazard of an HTF and addresses the conditions that can create this hazard. It also outlines appropriate steps to prevent or mitigate such occurrences, such as choosing the proper fluids and operating conditions.
- OSTI ID:
- 238012
- Journal Information:
- Chemical Engineering Progress, Journal Name: Chemical Engineering Progress Journal Issue: 3 Vol. 92; ISSN 0360-7275; ISSN CEPRA8
- Country of Publication:
- United States
- Language:
- English
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