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FUSION BONDED EPOXY COATED FOR FLANGE RAISED FACE

FUSION BONDED EPOXY COATED FOR FLANGE RAISED FACE

Rently we have a project which require AWWA C213 FBE lining and coating for flanges, inside is wras approved powder and external with

common poweder, but customer did not mention the raised face of flange need FBE coating and lining or not

Should the surfaces of flanges be coated to prevent corrosion?  from https://www.eng-tips.com/viewthread.cfm?qid=455179  the author give

a case of ARAMCO project,their conclusion is Flange surface is not coated.

During our production, Finally Internal surface of flange has been coated with FBE to prevent corrosion which will be caused by sea-water.
while this just applied for Blind flanges which may touch liquid,  and the coathing thickness is controled below 50 micron to ensure the seal
capacity with spiral wound gasket. and weld neck flange above not FBE linned.

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