• 13.04.2022

Heat shrinkable cuff Abris S-T-DTt

Section: Details

Heat shrinkable cuff Abris S-T-DTt

Scope of application:

The heat-shrinkable cuff Abris S-T-DTt is designed to provide high-quality corrosion protection of the welded joints of steel oil and product pipelines and branches from them, as well as repair of damaged insulation of pipelines, gas pipelines, oil pipelines, water pipes in highway conditions.

The heat-shrinkable cuff is made on the basis of Abris S-T-DTt material, which is a self-adhesive mastic-polymer part reinforced with a heat-shrinkable tape.

The cuff set consists of:

  • heat shrinkable cuff Abris S-T-DTt  TU 5772-003-43008408-99;
  • lock plate Abris S-T-DT TU 5772-003-43008408-99;
  • single-component primer R-NK TU 5775-004-52471462-2003.

The geometric dimensions of the heat shrinkable cuff depend on the outer diameter of the insulated pipe.

Geometric dimensions of the heat-shrinkable cuff:

Pipe outer diameter, mm Length, mm Thickness, mm Width, mm
57 250 1,8 450
89 370 1,8 450
108 430 1,8 450
114 470 1,8 450
159 620 1,8 450
168 650 1,8 450
219 810 1,8 450
255 930 1,8 450
273 990 1,8 450
325 1150 1,8 450
377 1320 1,8 450
426 1480 1,8 450
477 1650 1,8 450
530 1820 1,8 450
630 2140 2,0 450
720 2430 2,0 450
820 2760 2,0 450
920 3130 2,4 450
1020 3450 2,4 450
1067 3600 2,4 450
1220 4100 2,4 450
1420 4750 2,4 450

Geometric dimensions of the lock plate:

Pipe outer diameter, mm Length, mm Thickness, mm Width, mm
57-273 100 1,8 450
325-530 120 1,8 450
630-820 120 2,0 450
920-1420 150 2,4 450

In coordination with the designing organization, the dimensions of the cuff and lock plate (width, length and thickness) can be changed.

The heat-shrinkable cuff is available both as a set (ready-made segments for a certain pipe diameter) and in a roll for self-cutting of parts.

Technical specifications:

Indicator name Standard
1 Appearance There should be no defects on the surface (corrugations, bubbles, cracks, ruptures, through holes, violations of the continuity of the adhesive). Slight presence of shagreen is allowed.
2 Tensile strength at (20±5) °C, not less than, MPa 12,0
3 Elongation at break at a temperature of (20±5) °C, not less than, % 200
4 Adhesion to primed steel at a temperature of (20±5) °C, N/cm, not less 35,0
5 Adhesion to the factory coating at a temperature of (20±5) °C, N/cm, not less 35,0
6 The peeling area of the coating at cathodic polarization, cm², at a temperature of 20 °C, no more 5,0
7 The brittleness temperature of the mastic layer (flexibility on a rod with a diameter of 25 mm), °C, no more -60
8 The degree of shrinkage of the cuff in the longitudinal direction at a temperature of (140±5) °C, not less than, % 15

Note: The table shows the adhesion parameters of the cuff after heat shrinkage.

Application technology

It includes the following stages:

  1. Preparation of the surface of the welded joint and adjacent sections at a distance of at least 200 mm (brush or abrasive cleaning of dust, dirt, rust, moisture removal, degreasing);
  2. Processing of the adjacent factory coating at a distance of at least 100 mm with metal brushes to roughen the surface layer;
  3. Applying the primer to the prepared surface, capturing the areas adjacent to it with the factory coating;
  4. Application of the cuff with the required tension around the weld joint area;
  5. Installing the lock plate so that the upper edge of the overlap passes under the middle of the lock plate;
  6. Shrinkage of the cuff.

Advantages

  • Manufacturability (the kit is completely ready for use, there is no stage of applying a mastic-polymer layer);
  • Good adhesion to metal, concrete, plastic and various insulating coatings;
  • Does not require preheating of the pipe or mastic layer;
  • Resistance to aggressive environments;
  • Maintainability;
  • Possibility of application at negative temperatures up to -30 °C;
  • Operating temperature from -60 °C to +80 °C;
  • Preservation of sealing properties during vibration loads;
  • No waste;
  • Environmental safety;
  • Reliability.

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