Coats Based on Adhesive Tapes

A standard technique of covering pipes with adhesive tapes (in industrial conditions) or wrapping the installed pipeline (e.g. during field repair) consists of the following stages  

Application of the primer coat from a liquid quick-drying primer. The primer should moisten the pipe surface well and fill its irregularities, forming a water-impermeable layer. The primer usually contains contact Cl and bactericidal additives. 

Formation of a barrier later via winding a PVC or PE tape with a glued layer containing Cl or hydrophobic agents. 

Winding of the outer layer protecting the anticorrosion insulation against mechanical damage during transportation and installation of the pipeline. This layer is made of a sufficiently thick PE film (0.5 mm), which is the adhesive coat carrier. 

The insulation is formed with the help of special equipment that wraps the pipeline in the tapes without folds with about 15-25 mm overlap. A scheme for formation of the protecting coating is illustrated in Fig. 3.44. Application 

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