ArticlesAboveground Flammable and Combustible Liquid Tank Emergency Venting – Part 7: Interpolated Value Tank Venting Requirements
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Last week’s Coffee Break Training explained how to determine from a table the minimum capacity of normal and emergency vents when the wetted area of a flammable or combustible liquids storage tank is known and the value matches a specific area listed on the “Wetted Area vs. Cubic Feet (m3) Free Air Per Hour” table found in National Fire Protection Association 30, Flammable and Combustible Liquids Code. How does one deal with wetted areas that do not align with specific areas listed on the table? NFPA 30 permits interpolation between the two values to establish the minimum air flow required for ventilation. For example, what is the required ventilation if the wetted area of a tank measures 486 feet2(45.2 m2)?
