Thermal insulation of rigid Pur foam with a Pvc jacket on the knee pipeline in central heating, hot and cold water in residential, administrative and industrial buildings (except for overhead networks and exposed to sunlight). Heat transfer coefficient for polyurethane: λ ≤ 0.030 W / mK (t.50st. C); λ ≤ 0.025 W / mK (t.20st. C)