FIELD: heat insulation of pipelines.
SUBSTANCE: heat-insulated pipeline section comprises at least one inner pipe, heat-insulated layer based on the foamed polyurethane or polyisocyanurate, outer shell made of thermoplastic, and plastic film interposed between the thermoinsulated layer and outer shell. The plastic film consists of several layers. At least one layer is impermeable for foamed polyurethane in the cells or polyisocyanurate of foamed gas. The other layer is glued to the outer shell and to the heat-insulated layer.
EFFECT: prolonged service life.
10 cl, 2 dwg
