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Lightning on AST roofs thin surfaces

Lightning on AST roofs thin surfaces

Lightning on AST roofs thin surfaces

(OP)
thread184-179878: REFINERY VESSELS LIGHTNING PROTECTION - NFPA 780

NFPA mentions that AST metallic roofs that have a minimum of 3/16" thickness are inherently safe. What about the aLuminum domes structures made of high and thick beams and which provide the main "Faraday' structural protection and covered by thin aluminum plates ? I believe that the structural beams web is a inherently safe system for lighhtning protection, since these beams and their hubs are protuding and more than likely to attract the lightning ... I consider though that aluminum being 4 x times more electricity conductive than Steel and 3 x times more heat dissipating than steet, ALuminum beams structures + thin plates have higher lightning protection than stell roofs.

Does any one has some actual cases with this? NFPA are not precise enough about aluminum domes for AST...

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