Dust collectors for combustible dust will have a deflagration vent(s). These vents are like weak-seam welded roofs in that they are large surface area vent covers that relieve the pressure inside the dust collector should there be an explosion inside the collector. As one can imagine, someone standing in the path of these vent covers can be severely injured or killed if they strike them. So most codes will require the area in front of the panels to be labeled to keep workers and equipment out of harm’s way.
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2203.2.1 Signages and markings Signages and markings shall be provided in accordance with Sections 2203.2.1.1 through 2203.2.1.3. 2203.2.1.1 Deflagration vent discharge area markings. Where dust collection systems and other equipment, systems or system components are provided with deflagration vents, the area within the deflagration vent’s discharge area shall be marked in an approved manner. 2203.2.1.2 Caution signs. Signs that read as follows shall be posted near the dust-containing equipment with deflagration vents: CAUTION: THIS EQUIPMENT CAN CONTAIN EXPLOSIVE DUST KEEP OUTSIDE THE MARKED AREA WHILE EQUIPMENT IS OPERATING 2203.2.1.3 Warning signs Where dust collection systems and other equipment, systems or system components are provided with deflagration vents, vent closures shall be clearly marked as follows: WARNING: EXPLOSION RELIEF DEVICE. STAY CLEAR |