NFPA 61-1999 Standard for the Prevention of Fires and Dust Explosions in Agricultural and Food Products Facilities.
1-4 Definitions. Agricultural Dust.* Any finely divided solid agricultural material 420 microns or smaller in diameter (material passing a U.S. No. 40 Standard Sieve) that presents a fire or explosion hazard when dispersed and ignited in air. Approved.* Acceptable to the authority having jurisdic- tion. Authority Having Jurisdiction.* The organization, office, or individual responsible for approving equipment, an installa- tion, or a procedure. Bulk Raw Grain.* Bulk raw grain includes grain materials, such as cereal grains, oilseeds, and legumes, that have not undergone processing or size reduction. Explosion.* The bursting or rupture of an enclosure or container due to the development of internal pressure from a deflagration. Fire-Resistant Belting Materials. Those belts that meet Mine Safety and Health Administration (MSHA) 2G flame test for conveyor belting. Hot Work. Hot work includes cutting and welding, grind- ing, brazing, and similar heat-producing processes. Labeled. Equipment or materials to which has been attached a label, symbol, or other identifying mark of an orga- nization that is acceptable to the authority having jurisdiction and concerned with product evaluation, that maintains peri- odic inspection of production of labeled equipment or mate- rials, and by whose labeling the manufacturer indicates compliance with appropriate standards or performance in a specified manner. Listed.* Equipment, materials, or services included in a list published by an organization that is acceptable to the author- ity having jurisdiction and concerned with evaluation of prod- ucts or services, that maintains periodic inspection of production of listed equipment or materials or periodic eval- uation of services, and whose listing states that either the equipment, material, or service meets appropriate designated standards or has been tested and found suitable for a specified purpose.NFPA 61 pdf download.