Reduction of Hazard by Purging
The use of purging to reduce hazard is recognized in Article 500–1 of the National Electrical Code: “In some cases, hazards may be reduced or hazardous areas limited or eliminated by adequate positive-pressure ventilation from a source of clean air in conjunction with effective safeguards against ventilation failure. It is recommended that the authority enforcing this Code be consulted before such layouts are prepared.”
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- 1.RP12.4, “Instrument Purging For Reduction of Hazardous Area Classification,” Instrument Society of America, Pittsburgh.Google Scholar
- 2.McCarron, R., “Considerations in Instrument Case Purging,” Proceedings of 1960 Symposium on Safety for Electrical Instrumentation in Hazardous Areas.Google Scholar
- 3.Beutler, J. A., and J. A. Clark, “Heat Transfer and Computational Considerations in the Design of Instrument Cases for Operation in Hazardous Atmospheres,” Proceedings of 1960 Symposium on Safety for Electrical Instrumentation in Hazardous Areas, Instrument Society of America, Pittsburgh.Google Scholar