This is one of the most commonly asked questions in our world. A shrink sleeve needs to be wide enough to cover all bare steel of the field joint AND overlap onto either side of the adjacent factory applied coating by at least 2 inches (50mm) per side.
It is important to note that while some end users are comfortable with a 2 inch overlap per side; many do require 3, 4 or sometimes even 6 inches of overlap onto either side of the factory applied coating. As a common rule of thumb, it is reasonable to accept that most factory applied coatings do have standard cutbacks. It is always dangerous to assume, though - so be careful!
It is important to note that while some end users are comfortable with a 2 inch overlap per side; many do require 3, 4 or sometimes even 6 inches of overlap onto either side of the factory applied coating. As a common rule of thumb, it is reasonable to accept that most factory applied coatings do have standard cutbacks. It is always dangerous to assume, though - so be careful!
Standard Cutbacks of the more commonly used factory applied coatings in the USA
Fusion Bonded Epoxy (FBE) - 2 to 3 inches per side (commonly uses an 11" wide shrink sleeve)
Fusion Bonded Epoxy (FBE) - 2 to 3 inches per side (commonly uses an 11" wide shrink sleeve)
Two Layer PE - 5 to 6 inches per side (commonly uses a 17" wide sleeve)
Three Layer PE - 5 to 6 inches per side (commonly uses a 17" wide sleeve)
Three Layer PP - 5 to 6 inches per side (commonly uses a 17" wide sleeve)
Coal Tar Enamel - 2 to 3 inches per side (commonly uses an 11" wide shrink sleeve)
Zaplock Pipe - commonly uses a 34" wide sleeve
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