Vessels in a refinery which are tall and slim are usually not required to have lightning protection since they are constructed of metal of at least 3/16" in thickness and are electricall conductive. However, what if the vessel is covered with insulation, top to bottom. Normally the cladding that covers the insulation is only 14ga and not electrically continous. NFPA is not specific as to whether it should be protected. Does anyone know?
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REFINERY VESSELS LIGHTNING PROTECTION - NFPA 780
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