Heat insulating pipe

Details Heat insulating pipe Heat insulating pipe

1982-11-29

1984-07-10

Bryant, III, James E.

Pipes and tubular conduits

Distinct layers

With intermediate insulation layer

138DIG9, F16L 5914

Patent

active

044587236

ABSTRACT:
A heat insulating pipe has a foamed heat insulating layer on its outer circumferential face in which the heat insulating layer has an expansion ratio of at least 4 and is of a three-layered structure consisting of a middle foamed layer and lower and upper foamed layers formed at both sides of the middle foamed layer. The cells of the middle foamed layer are relatively large. The cells of the upper foamed layer and the lower foamed layer are relatively small. The shapes of the cells of the middle foamed layer are such that, for the average cell diameter (.mu..sub.1) measured in the radial direction of the pipe and the average cell diameter (.mu..sub.2) measured in the axial direction of the pipe, the relation of .mu..sub.1 /.mu..sub.2 =0.3-0.9 holds.

REFERENCES:
patent: 3007203 (1961-11-01), Ammons
patent: 3345245 (1967-10-01), Hanusa
patent: 3431164 (1969-03-01), Gilbert
patent: 3506600 (1970-04-01), Zocco et al.
patent: 3649730 (1972-03-01), Benteller et al.
patent: 4053341 (1977-10-01), Kleiner et al.
patent: 4098941 (1978-07-01), Johnson
patent: 4146562 (1979-03-01), Fukushima et al.
patent: 4221624 (1980-09-01), Eslinger et al.
patent: 4352701 (1982-10-01), Shimba et al.

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