I have a question regarding the need to provide electrical classification for a building using Class 1A flammable liquids.
For this building, 4 gallons could be out in use (located anywhere in the building). The MAQ is 10 gallons. I have discussed this with NFPA 30 committee, the manufacturer, and the AHJ (who is a knowledgeable FPE). They have all determined that even if the MAQ is not exceeded, electrical classification is required if a flammable/explosive mixture could be present. The NFPA 30 staff directed me to a provision in NFPA 497, Section 5.5, that if the materials will not reach 25% of the lower flammable limit (LFL), this could be utilized to justify not providing classified electrical fixtures. Does anyone know how to do this calculation, or know of firms that can be hired to do this? I am an FPE and do not know how to perform it, and I have spoken with other FPE’s who also are not aware. The gentleman I spoke with at NFPA 30 agreed it would be by an industrial hygienist or a chemical engineer and not an FPE. But does anyone know any that can be hired for a one-off calculation, or have a place where I could learn how to perform it myself (NFPA reference, SFPE article, course, etc.?). Thank you! Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe
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Building owner is looking to lease some warehouse space for the storage of hand sanitizer…looking at the MSDS, I see it listed as a Class IB flammable.
Going to NFPA 30 and seeing section 16.5.2.7 would be the most appropriate…which then flips me to section 16.6.1 Scheme A as the Sprinkler arrangement. I have to look to see what design densities are needed for the ceiling spray heads and the in-racks. Is this the correct approach? Is NFPA 30 applicable here? Just wanted to make sure I’m not missing something. Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe |
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