(71b) Using Ventilation to Reduce the Area Electrical Classification of Pilot Plants and Laboratories
- Conference: AIChE Spring Meeting and Global Congress on Process Safety
- Year: 2019
- Proceeding: 2019 Spring Meeting and 15th Global Congress on Process Safety
- Group: Process Development Division
- Time: Tuesday, April 2, 2019 - 8:25am-8:50am
All codes allow the use of ventilation to mitigate against the risk of a fire or explosion from flammable gases and vapors. The use of ventilation to reduce the area electrical classification of pilot plants nd laboratories is a well established practice. However, the risk mitigation is often poorly analyzed and often rests on questionable assumptions. This leads to the potential for inadvertently being at a higher hazard level than the organization realizes.
This presentation will address several issues regarding the effective use of ventilation to reduce the risk and hence allow a lower area electrical classification. Areas to be covered include:
- A brief summary of the code requirements
- A discussion of how ventilation can â and cannot â mitigate fire and explosion hazards
- A discussion of how hoods and ventilated enclosures often fail to contain the results of leakage, spills, and equipment failures including:
- Inadequate design
- Too low an exhaust rate
- Over crowding
- Poor exhaust distribution
- Some guidance on how to use ventilation effectively
- Guidelines on how to make ventilation effective
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