How does a facility count the amount of a release-flammable Chemical of Interest (COI) in a mixture with a National Fire Protection Association (NFPA) rating of 4?
Pursuant to ยง27.240(a)(2), if a release-flammable chemical of interest is present in a mixture in a concentration equal to or greater than one percent (1%) by weight of the mixture, and the mixture has a NFPA flammability hazard rating of 4, the facility shall count the entire weight of the mixture toward the COI’s Screening Threshold Quantity (STQ). For example, if a facility has 500 pounds of a flammable mixture containing five percent (5%) pentane and the mixture as a whole has a NFPA flammablility hazard rating of 4, the facility shall count the entire weight of the mixture, or 500 pounds toward pentene’s STQ of 10,000 pounds. A release-flammable mixture with 1% or more of a release-flammable COI and an NFPA hazard rating of 4 must be counted whether stored above or below ground. For more information on calculating the STQ for COI in release-flammable mixtures, including release-flammable mixtures that are fuels, please refer to the Top-Screen User’s Manual, which is available onli
Related Questions
- How does a facility count the amount of a release-flammable Chemical of Interest (COI) in a mixture with a National Fire Protection Association (NFPA) rating of 4?
- How does a facility count the amount of release-flammable mixture with an NFPA rating of 4 if it is stored in either below or above ground tank(s)?
- How does a facility count the amount of release flammable COI in a mixture that is not a fuel with an NFPA rating of 1, 2, or 3?
