An insulating flange assembly connects a steel or stainless steel or ductile iron riser pipe and incorporates dielectric isolation components to prevent galvanic corrosion. A one-eighth inch thick insulating gasket is positioned between the mating flanges. Flange bolts are isolated using a full-length reinforced phenolic resin or mylar sleeve, phenolic washers typically placed under the steel washers, and flange nuts.
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