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Tape Coating

Tape Coating

Tape Coating

AMERICAN’s tape coating meets the requirements of either ANSI/AWWA C214 (pipe) or ANSI/AWWA C209 (fittings and specials). Tape coating machine-applied to straight pipe is generally a four-layer system consisting of a liquid adhesive, a 20-mil corrosion protection layer, and two 30-mil mechanical protection layers, for a total system nominal thickness of 80 mils. Tape coating hand-applied to fittings and specials is a three-layer system consisting of a liquid adhesive and two 35-mil layers of backed butyl adhesive, for a total system nominal thickness of 70 mils.

The application process for machine-applied tape coating consists of proper surface cleaning and blasting, application of liquid adhesive, and the sequential application of the inner layer corrosion protection tape and generally two outer layers of mechanical protection tape. Following application of the inner layer, but prior to the application of the mechanical layers, the inner layer tape is subjected to an electrical holiday inspection to verify dielectric integrity. Following the application of all tape layers, the system is subjected to pull-off tests to verify adhesion strength. 

The process for hand applying tape coating on fittings and specials is similar to the machine-applied process, but using two layers of equal thickness tape.