Thermal insulation enhancement

Details Thermal insulation enhancement Thermal insulation enhancement

1980-01-09

1981-08-25

Bryant, III, James E.

Pipes and tubular conduits

Distinct layers

With intermediate insulation layer

138111, F16L 1112

Patent

active

042853699

ABSTRACT:
A core element, as for example a pipe, tube, hose or the like, has thermal insulation applied thereto in the form of a plurality of layers of tape applied in a continuous process in which conditions are selected to deliberately create wrinkles thereby defining air spaces serving to further reduce the transmission of heat through the composite thermal insulation. The wrinkles may be introduced by wrapping the tape about the pipe at an applied angle greater or smaller than the angle required for a given effective diameter, overlap factor, and width of tape, At the outer surface of the wrap the tape is substantially wrinkle-free and a jacket of polyvinyl chloride or the like is applied thereto. The difference between a theoretical angle of application calculated to produce a wrinkle-free wrap, and an actual angle of application, is progressively lowered in a direction radially outwardly from the tube or other core element, thus causing the wrinkles to become, correspondingly, more and more pronounced in a direction radially inwardly from the jacket. In turn, the air spaces or voids are thereby caused to become progressively enlarged in the radial inward direction, becoming maximized at the surface of the core, that is, at the precise location which has the highest thermal gradient.

REFERENCES:
patent: 332258 (1885-12-01), Lamkin
patent: 417768 (1889-12-01), Bartlett
patent: 1045459 (1912-11-01), Todd et al.
patent: 3529632 (1970-09-01), Johns
patent: 3853149 (1974-12-01), Stine
patent: 3981689 (1976-09-01), Trelease
patent: 4194536 (1980-03-01), Stine et al.

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