US 12,241,581 B2
Pipe for conveying fluids in HVACR systems and composite coating for such a pipe
Nicola Pilone, Clarks Green, PA (US)
Assigned to Ptubes, Inc., Honesdale, PA (US)
Filed by PTubes, Inc., Honesdale, PA (US)
Filed on Aug. 9, 2021, as Appl. No. 17/397,264.
Prior Publication US 2021/0396344 A1, Dec. 23, 2021
Int. Cl. F16L 59/02 (2006.01); F16L 59/10 (2006.01)
CPC F16L 59/029 (2013.01) [F16L 59/028 (2013.01); F16L 59/10 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A composite coating for an inner tube delimiting a passageway for a fluid for obtaining a pipe for conveying fluids in HVACR systems, wherein said composite coating comprises:
at least one tubular insulating cover having an outer surface and designed to cover or enclose an inner tube, which cover is made of an insulation material, wherein said insulation material is selected from the group consisting of ethylene-propylene-diene-monomer (EPDM) based foam, polypropylene (PP) based foam, and a mixture of polyvinyl chloride (PVC) based foam and nitrile butadiene rubber (NBR) based foam; and
at least one tubular jacket, wherein an inner surface of said at least one tubular jacket is in contact and bonded with the outer surface of said tubular insulating cover, wherein said at least one tubular jacket comprises at least one of a thermoplastic elastomer, polyethylene (PE), polyvinyl chloride (PVC), ethylene-propylene-diene-monomer (EPDM), or a mixture thereof, wherein the at least one tubular jacket includes at least one slipping agent.