Ventilation of Hazardous Area
Ventilation of Hazardous Area
(OP)
Anyone know the code or governing authority on ventilation for hazardous areas? The International Mechanical Code calls for 1 cfm/sqft. What about pressure control? I assume that a hazardous area should be negative. Don't know exactly what's in the room other than it is used for chemical storage. There is currently exhaust and I have been asked to look into providing makeup air. How can I quantify what needs to be done?





RE: Ventilation of Hazardous Area
RE: Ventilation of Hazardous Area
RE: Ventilation of Hazardous Area
ventilation:
Sufficient air movement throughout the room or building to prevent the formation of pockets of stale air.
Sufficient fresh air supply and foul air exhaust to limit the level of air pollution from all sources in the building.
RE: Ventilation of Hazardous Area
RE: Ventilation of Hazardous Area
The determination that areas can be classified as hazardous locations is based on the following:
The possible presence of an explosive atmosphere such as flammable gases, vapors, or liquids (Class I), combustible dusts (Class II) or ignitable fibers & flyings (Class III);
the likelihood that the explosive atmosphere is present when equipment is operating; and
the ignition-related properties of the explosive atmosphere that is present.
This approach to classifying hazardous locations is used by the United States (National Electrical Code), Canada (Canadian Electrical Code), Europe (CENELEC EN60079-10) and throughout the world (IEC 60079-10).
RE: Ventilation of Hazardous Area
RE: Ventilation of Hazardous Area