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Flange Protection System

FLANGE PROTECTION

The Flange Protection system consists of the VISCOSEALANT in combination with the EZ WRAP to stop corrosion between the flange faces of onshore and offshore applications. The system provides a seal that is not affected by vibrations of the pipeline, movements, freeze/thaw, expansion & contraction. VISCOTAQ is hydrophobic; therefore water intake and water vapor permeability are very low. VISCOTAQ is non-toxic, contains no VOC’s and adheres aggressively to most all surfaces such as steel, PE, epoxies, tar, stainless, aluminum, etc. The result is a long-term corrosion prevention system and a maintenance-free solution for many years. The coating remains in intimate contact with the substrate creating an impermeable homogeneous corrosion prevention coating.

flange surface preparation

STEP 01: SURFACE PREPARATION

  • Minimum surface preparation should be SSPC-SP2 (Hand Tool Clean).
  • Once loose materials are removed, clean surface with denatured alcohol or acetone to remove any remaining dust, grease and moisture.
  • Surface of the substrate should be 5°F+ above the dew point.
  • Keep the working area clean and dry. Avoid the presence of water.
Flange Protection System viscosealant

STEP 02: VISCOSEALANT APPLICATION

  • VISCOSEALANT is to be applied into the void between the flange faces. Protect flange neck with a removable tape in order not to pollute the neck with the VISCOSEALANT.
  • For optimum application of VISCOSEALANT, preheat material to 35°C/90°F.
  • Inject the VISCOSEALANT into the space between the flange faces around the complete circumference of the flange.
  • Dependable upon the flange class and type, a flexible nozzle can be used to better penetrate the flange aperture.
EZwrap

STEP 03: EZ WRAP APPLICATION

  • Remove the protective tape on the neck and apply one layer of EZ WRAP over the complete circumference of the flange.
  • Overlap EZ Wrap at least 5 cm/2’’. A roller may be used to ensure adhesion.
  • In case the flange neck does not match the width of the EZ WRAP, apply separate wraps in such a way that the circumference overlap between the two wraps is always a minimum 1”. Termination of wraps to be staggered. Install cap on nut and bolt.

VISCOTAQ PROTECTION FOR BURIED FLANGES

VISCOTAQ’S® molecular chemistry is unique and designed in such a way that the viscosity gives it permanent wetting characteristics; forcing the material to flow into the pores and anomalies of the substrate. The elasticity of the product gives it the strength and feeling of a solid. VISCOTAQ® always remains in a semi solid state, offers immediate adhesion without the need for primer, requires minimal surface preparation and forms a homologue, continuous, self healing corrosion protective coating. VISCOTAQ® Products can be molded around the bolts and uneven surface. They bond at a molecular level creating a coating that is impermeable to moisture & oxygen; thus protecting the substrate against corrosion.

flange valves repair

STEP 01: SURFACE PREPARATION

  • Minimum surface preparation should be SSPC-SP2 (Hand Tool Clean).
  • Once loose materials are removed, clean surface with denatured alcohol or acetone to remove any remaining dust, grease and moisture.
  • Surface of the substrate should be 5°F+ above the dew point.
  • Keep the working area clean and dry. Avoid the presence of water.
viscopasteand-viscosealant applied on flange valves

STEP 02: VISCOSEALANT/VISCOPASTE APPLICATION

  • Viscosealant is to be applied into the gap between the flange faces using injector tool.
  • For optimum application of Viscopaste, the material should have a temperature 25°C/77°F. Use putty knife knead the Viscopaste at a 45° angle from the flange rim toward the pipeline. All bolts and nuts should be covered with Viscopaste.
viscowrap ht applied on flanges

STEP 03: VISCOWRAP APPLICATION

  • Apply Viscotaq® Viscowrap into the direction of the factory coating and end straight with an overlap of minimum 100cm/4” onto the factory coating.
  • Continue the application of wrap with 1cm overlap between the layers. Lay the Viscotaq® Viscowrap around the main pipe and smooth the fabric on to the surface of flange.
outerwrap application on flange valves

STEP 05:OUTERWRAP APPLICATION

  • Start with a circumferential wrap. Apply the Outer Wrap criss-cross around the flannged connection until all Viscowrap is covered.
  • Finish the flange with Outer Wrap on straight sections.
  • Apply with 50% overlap, with tension and without any air inclusions. Leave 1/4’’ section of Viscotaq® Viscowrap outside on both ends.
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