What is a high KST value?
In general, the larger the KSt value is, the more violent the explosion. The Kst value is used to size explosion deflagration venting and pressure relief apparatus. The higher the Kst value, the larger the deflagration vent area is needed.
What type of dust is combustible?
Examples of combustible dust: Metal Dust – Such as Aluminum and Magnesium. Wood Dust. Coal and Other Carbon Dusts. Plastic Dust and Additives.
What is the KST value of sugar?
The Imperial Sugar Plant outside of Port Wentworth, Georgia in 2008 was caused by sugar dust with a Kst value of around 138. Though these are only a few examples, the agricultural industry faces numerous types of explosive dusts ranging from egg white powder to hops used in brewing beer and tobacco dusts.
What NFPA 654?
NFPA 654: Standard for the Prevention of Fire and Dust Explosions from the Manufacturing, Processing, and Handling of Combustible Particulate Solids.
Is dust combustible normal?
In practice, for a dust explosion to occur, a number of conditions must be met including: The dust must be combustible and release enough heat when it burns to sustain the fire. The dust must be capable of being suspended in air. The dust must have a particle size capable of spreading the flame.
Is my dust explosive?
A value over 0 and below 200 could result in a “weak explosion.” A value between 200 and 300 could result in a “strong explosion.” These substances might include cellulose or wood flour. A value over 300 could see a “very strong explosion.” These materials might include aluminum or magnesium dust.
Is NFPA 652 a law?
Enforcement risk. Facilities that have known combustible-dust hazards and have not yet completed a DHA should do so as soon as possible. While NFPA 652 is not a legally binding standard, OSHA looks to the NFPA standards, and NFPA 652 in particular, to establish GDC violations regarding combustible dust.
What NFPA 664?
NFPA 664: preventing fires and explosions among conveyance equipment. It’s no secret that risk accompanies wood processing. Wood burns. Dry wood burns easily.
What is the dust explosion pentagon?
The dust explosion pentagon is an expansion of the fire triangle as it relates to dust. The fire triangle starts with fuel, oxygen, and an ignition source. So if you have these three elements at the same time, you can get a fire.
