Corrosion between the faces of pipe flanges causes early paint failure and can compromise flange integrity.
Current methods (Flange Protectors,Caulking &tapes) are only short term measures. For long term solutions, FlangeShield System is the answer.
It is impossible to achieve good surface preparation on flanges which are inaccessible to the blast medium.It is not uncommon to find residual blasting sand or grit lodged between the fasteners and the flange body, or up inside the bolt hole annuli. This grit acts like a sponge to retain water inside the flange and thus promotes rapid failure of the applied paint system.
The use of tapes alone does not prevent galvanic corrosion from taking place and very often these have a limited life and require replacementhttp://www.pj-energy.com/CorroShield.asp#Detail1
Wednesday, May 6, 2009
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