Airvate Blog

  When doing calculations, designing, and/or on-site work, we have to figure out which standard and code (federal, state, local) we will follow.   EPA and Permits EPA Title V Operating Permits (EPA) National Emission Standards for Hazardous Air Pollutants (NESHAP), Rule 6X for metalworking operations (EPA) Method 22: visual determination of fugitive emissions from material sources (EPA) Method 9: Visual determination of the opacity of emissions from stationary sources NAAQS (National Ambient Air Quality Standards)  On-site Measurement OSHA Technical Manual (OTM) Section II: Chapter 3, on-site Measurement (EPA) Method 22: visual determination of fugitive emissions from material sources (EPA) Method 9: Visual determination of the opacity of emissions from stationary sources Airborne Contaminants Cal/OSHA Title 8 Section 5155 - Airborne Contaminants OSHA (CFR, Title 29,1910) and Subpart Z - Toxic and Hazardous Substances OSHA 3348-05: Guidance for the Identification and...

  I happened to see a crushed filter cartridge when on-site. Normally, it is hard to see one, as they are always thrown into a Toter quickly and stealthily before someone notices. Though crushed, it still looks cool.  A crushed filter cartridge (1) A crushed filter cartridge (2)

This blog post consists of 4 sections 1. Brief on the Ferrous Sulfate Process (in a customer’s plant) 2. Introduction about Ferrous Sulfate and its hydrate state 3. Ferrous Sulfate in the product recovery system and problems it caused 4. Workplace exposure limit of Ferrous Sulfate Brief on the Ferrous Sulfate Process The Ferrous Sulfate heptahydrate bulk first goes through a dryer heated by hot air, then is lifted by a basket elevator to a cooling bed cooled by ambient air from the outside of the building. The exhaust airflows from the dryer and the cooling bed go to the same baghouse for product recovery . The old product recovery system was removed after years in duty and replaced, since the old one couldn’t meet the airflow requirement for the process. The old baghouse was made of carbon steel, while the new one was made of stainless steel which is more suitable for this moist and corrosive situation. Introduction about Ferrous Sulfate and its hydrate state Ferrous Sulfate,...