▎ 摘　　要

NOVELTY - The apparatus comprises a Polyurethane (PU) layer (420) that contacting an upper unit along a length of a pipe. A Polyethylene Terephthalate (PET) layer (418) surrounds the PU layer and the length of the pipe. An epoxy shell surrounds the PET layer. A graphene layer (414) is configured to surround the shell. An air gap (424) is formed on a side of a polymer thermal expansion based passive thermal diode (PTE-PTD), where the air gap provides an upward movement of the layer using opposite forces of alternate sides of the PET layer. An assembly system (402) connects ends of the layers along the length. The PU layer provides a low-friction contact (406) with the pipe. USE - Apparatus for improving flow of fluids, wet crude oil, and export crude oil in pipelines. Uses include but are not limited to gas and oil separation plants (GOSPs), refineries for processing, and tank farm terminals (TFTs) for storing or shipping through pipelines system using electromechanical pumps. ADVANTAGE - The apparatus provides highly-maximized daily thermal inflow, reduces need for an active heat exchanger, eliminates need for a power supply and hazard of a nearby power source, provides easy assembly, and increases impact of pump durability. The apparatus utilizes insulation to wrap a pipeline to avoid thermal leaks at low temperatures and absence of insulation at higher temperatures to retain fluid viscosity, thus avoiding thermal outflow at low external temperatures, such as during night and the absence of an insulator. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for: (a) a method for providing a polyurethane layer configured to contact an upper unit along the length of a pipe. DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of the apparatus. Assembly system (402) Low-friction contact (406) Graphene layer (414) PET layer (418) PU layer (420) Air gap (424)