FIELD: metallurgy.
SUBSTANCE: tube can be fabricated out of one, two or more fragments of sheet material. A profiled insertion made as one piece with a flat tube or made of another sheet of material can be used to form several channels for flow via the tube. The tube can be also manufactured of relatively thin material, and also can be reinforced by bending material of the flat tube and/or insertion in areas subjected to effect of higher pressure and temperature. Additionally, relatively thin material of the flat tube can have a corrosion layer protecting material from failure because of corrosion.
EFFECT: increased quality.
22 cl, 96 dwg
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