Is used: Oil and gas industry
Polymer-bitumen rapes, heat shrink tapes
Polymer-bitumen rapes are to be used for wrapping the coating during en route capital repairs of the insulation coating (re-insulation) of gas pipelines with a diameter of up to 1420 mm inclusive and a transported product temperature of +35 °Ñ maximum.
| Ratio, measurement unit | Standard as per Technical Specifications | |||
|---|---|---|---|---|
| LITKOR-NK-GAZ | POLYKOR |
DONRAD-GAZ, DONRAD-ARM | POLYLEN-OB | |
| Plasticity on a beam, rounding radius = 10 mm, °Ñ, maximum | -20 | -20 | -20 | - |
| Adhesion to bitumen-polymer coating, t= 20°Ñ, N/cm, minimum | 10,0 | 10,0 | 10,0 | - |
| Adhesion of overlapped tapes, t = 20°Ñ, N/cm, minimum | 7,0 | 7,0 | 7,0 | >7,0 |
| Resistance of base tape rupture lengthwise, t = +23±2°Ñ, MPa, minimum | 12,0 | 12,0 | - | - |
Heat shrink tapes are to be used as a protective wrap for combined coatings based on bitumen-polymer mastics to protect main, infield and process pipelines. The tapes are rollsproduced by the extrusion method and are subject to relaxation (length shrinks) at 60 °Ñ.
| Ratio, measurement unit | Standard as per Technical Specifications | ||
|---|---|---|---|
| TERMA-L | DRL-L | POLYTHERM | |
| Rupture resistance, MPa, minimum | 12 | 12 | >12 |
| Relative rupture elongation, %, minimal | 200 | 200 | >200 |
| Electric strength, kW/mm, minimum | 10 | 5 | - |
| Lengthwise shrinkage, %, minimal at t = 140 °Ñ | 15 | 15-40 | 15-30 |
| Relaxation, %, minimal at t = 60 °Ñ | 4 | 3-10 | >4 |