Assistance with Compliance to NFPA 652
National Fire Protection Association Standard on the Fundamentals of Combustible Dusts
Most any material that is combustible in a solid mass form, is explosive when in the powdered form, typically 425 microns and smaller ( 0.165 inches or US Standard 40 Mesh ). This includes most any agricultural product, and processed products: sugar, starch, milk powder, pectin, fertilizer, nutraceuticals, plastic, and metal powders.
One requirement of NFPA 652 is to assure that your dust is conveyed at high enough velocity to prevent dust from settling in the duct system. These velocities must be documented, and periodically tested to assure that minimal duct velocities are maintained. Each collection point must be marked with its design intake air flow volume, so it can be verified during maintenance inspections. OSHA inspectors do inspect duct internals for combustible dust build up! Baghouse Duct Design dot Com™ can design a proper duct system, and provide you with the documentation required of NFPA 652 and assist your maintenance personnel with establishing a program to periodically verify that minimal air flow volumes are being met.