What are the 6 major categories of dust?
Common categories of combustible dusts include food, agricultural products, metal, wood, plastics, chemicals, coal, and other carbonaceous material (Table 1).
Is dust an explosion hazard?
Combustible dusts can fuel a flash fire or explosion when dispersed in a dust cloud. Workers in many industries who handle combustible solids may be exposed to combustible dust incidents that can cause catastrophic destruction, injuries and deaths.
What are dust explosions called?
What is deflagration? Deflagration is a term often used to describe combustible dust explosions.
How do you classify combustible dust?
If the material will burn and contains a sufficient concentration of particles 420 microns or smaller to create a fire or deflagration hazard, it should be classified as a combustible dust.
What is dust classification?
A scheme for classification of dusts is illustrated which classifies dust into: oxidizers, explosives, and pyrophoric materials; noncombustible dusts; and combustible dusts with various ignition sensitivities that have either conductive or nonconductive resistivity.
What NFPA 652?
The National Fire Protection Association (NFPA) 652, Standard on the Fundamentals of Combustible Dusts, provides general requirements for the management of combustible dust fire and explosion hazards and directs the user to appropriate NFPA industry or commodity-specific standards.
How is dust explosive?
Dust explosions are the result of high concentrations of combustible dust particles rapidly combusting inside an enclosed space. When mixed with oxygen, these fine particles can be ignited when coming into contact with a spark, metal ember, cigarette butt, or other ignition source.
What type of hazard is dust?
Exposure to dust can cause irritation to the eyes, skin and respiratory tract, and prolonged exposure can lead to a range of serious lung diseases including silicosis, coal workers’ pneumoconiosis (CWP), chronic obstructive pulmonary disease (COPD) and lung cancer.
Is PVC dust combustible?
The mixture of PVC powder is ignitable at 60 g/m3 which potentially can occur if a large bag breaks or the material overflows.
How does combustible dust explode?
What is a Class II dust?
NFPA 70, National Electrical Code , defines a Class II hazardous (classified) location as one that is hazardous because of the presence of a combustible dust.
Is combustible dust a hazardous material?
Combustible dusts are fine particles that present an explosion hazard when suspended in air under certain conditions. A dust explosion can cause catastrophic loss of life, injuries, and destruction of buildings.