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Field Joint Coating - SKPS

FIELD JOINT COATING

VISCOWRAP is an amorphous (non-crystalline) a-polar viscous elastic solid polyolefin coating in roll form used for the protection of under- and aboveground substrates against corrosion.VISCOWRAP is a 2-layer system that consists of a corrosion protective inner wrap (VISCOWRAP) and mechanical protective outer wrap or outer coating. Viscotaq has proven to be nonshielding due to its van der Waals bonding on a molecular level and its amorphous nature forming a continuous coating.

STEP 01: SURFACE PREPARATION

  • Minimum surface preparation should be ST2/ SSPC-SP2 (Hand Tool Clean).
  • Clean surface with denatured alcohol or acetone to remove any remaining dust, grease and mois ture.
  • Surface of the substrate should be 5°F+ above the dew point.
  • The adjacent coating should be roughened by means of sand paper or a grinding machine (If applicable). Sugges ted overlap on to the exis ting pipe coating: < 30” pipelines 4” overlap, > 30” pipelines 6” overlap.

STEP 02: VISCOWRAP APPLICATION

  • VISCOTAQ VISCOWRAP is applied by removing the release liner and placing adhesive side on the pipe.Initial wrap should be a straight circumference wrap.
  • Once initial straight circumference wrap is completed, wrap with slight tension and a minimum 1/2” overlap.Wrap at an angle to create a smooth overlap.
  • For coating repairs and difficult to reach areas VISCOWRAP can be applied in pieces, strips or individual circumference wraps (cigarette wrap).

STEP 03: PE/PVC OUTERWRAP

  • Outerwrap should be wrapped with tension and a minimum of 50% overlap.
  • First wrap and termination wrap should be a straight circumference wrap.
  • A 1⁄4” section of ViscoWrap should still be visible at after the PVC or PE Outer Wrap had been applied.
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