WATER-SUPPLY PIPE WITH THERMAL INSULATION Russian patent published in 2008 - IPC F16L59/00 F16L59/14 

FIELD: transportation, heating.

SUBSTANCE: in water-supply pipe with thermal insulation with at least one inner pipe, thermal insulation layer on the basis of polyurethane foam encompassing inner pipe, film encompassing thermal insulation layer and corrugated outer pipe made of thermoplastic polymer, the thermal insulating material consists of polyurethane foam with partially open pores and with elongation at break not more than 15%. Between thermal insulation layer and film there is resilient intermediate layer made of soft polymer foam which is at least bonded with the film and outer pipe has corrugation with depth of corrugations in the range from 5/D to 12/D and distance between corrugations in the range from 10/D to 25/D where D is external diameter of outer pipe as measured over corrugation top.

EFFECT: increase of pipe flexibility and its thermal-insulating properties improvement.

10 cl, 1 dwg