NFPA 68: Standard on Explosion Protection by Deflagration Venting products offered by IEP Technologies.
Deflagration is acombustion that propagates through a gas or along the surface of an explosive at a rapid rate driven by the transfer of heat. IEP Technologies are designed to comply with NFPA 68 and to detect and contain explosions from spreading to interconnected equipment and other locations within the processing facility.
There are two approaches to handling deflagration from spreading down a pipeline damaging equipment to meet the NFPA 68 standard.
The first is to use a chemical suppression system. In this system, the pressure wave is detected by a sensitive press sensor that is measured by a control unit which instructs a chemical suppression agent to be discharged into the pipeline mitigating the passage of the flame and burning material further down the pipeline.
The second is to use a mechanical isolation system. In this system, the pressure wave is detected by a sensitive press sensor that is measured by a control unit which instructs a high speed knife valve to close forming a barrier, stopping the flame and burning material from traveling further down the pipeline.
Both of these approaches to eliminate a deflagration condition from causing damage to equipment and injury to employees has been proven highly effective. IEP Technologies used to eliminate deflagration problems are being applied around the world.
The NFPA 68 standard applies to the design, location, installation, maintenance, and use of devices and systems that vent the combustion gases and pressures resulting from a deflagration within an enclosure so that structural and mechanical damage is minimized.
NFPA 68, Venting of Deflagrations, applies to equipment or enclosures needing to withstand more than 1.5 psig pressure. Most dust collectors need additional reinforcement for that capability. The maximum pressure that will be reached during an explosion will always be greater than the pressure at which the vent device releases. NFPA 68 calls for a pressure differential of at least 50 lbs./ft2 or 0.35 psi between the vent release pressure and the resistive pressure of the dust collector (enclosure). This NFPA guide lists the following basic principles that are common to the venting of deflagrations. You should become familiar with these principles so that you can correctly specify the conditions the dust collector and explosion vent must satisfy.
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