NFPA 655-2001 Standard for Prevention of Sulfur Fires and Explosions.
3.1 General. The definitions contained in this chapter shall apply to the terms used in this standard. Where terms are not included, common usage ofthe terms shall apply. 3.2 NFPA Official Definitions. 3.2.1* Approved. Acceptable to the authority having juris- diction. 3.2.2* Authority Having Jurisdiction. The organization, of- fice, or individual responsible for approving equipment, ma- terials, an installation, or a procedure. 3.2.3 Labeled. Equipment or materials to which has been attached a label, symbol, or other identifying mark ofan orga- nization that is acceptable to the authority having jurisdiction and concerned with product evaluation, that maintains peri- odic inspection ofproduction oflabeled equipment or mate- rials, and by whose labeling the manufacturer indicates com- pliance with appropriate standards or performance in a specified manner. 3.2.4* Listed. Equipment, materials, or services included in a list published by an organization that is acceptable to the authority having jurisdiction and concerned with evaluation of products or services, that maintains periodic inspection of production oflisted equipment or materials or periodic evalu- ation ofservices, and whose listing states that either the equip- ment, material, or service meets appropriate designated stan- dards or has been tested and found suitable for a specified purpose. 3.2.5 Shall. Indicates a mandatory requirement. 3.2.6 Should. Indicates a recommendation or that which is advised but not required. 3.3 General Definitions. 3.3.1 Combustible Dust. Any finely divided solid materials that is 420 microns or smaller in diameter (material passing a U.S. No. 40 Standard Sieve) and presents a fire or explosion hazard when dispersed and ignited in air. 3.3.2* Sulfur Dust (finely divided sulfur). See Combustible Dust.
4.1.3 Operation and maintenance ofall crushing and pulver- izing machinery shall be under supervision. 4.2 Location, Construction, and Venting of Buildings and Equipment. 4.2.1 Location of Crushing or Pulverizing Machinery and Containers. 4.2.1.1 The enclosed or semienclosed space in which the crushing or pulverizing machinery is located shall be used for no other purpose during the periods when size reduction of sulfur is in progress. Exception: Containers shallbe permitted to be filled with the ground product. 4.2.1.2* Containers shall be removed from the area as soon as possible after being filled. Containers shall not be allowed to accumulate in the area.NFPA 655 pdf download.