Heat-insulated pipe-lines
First Claim
1. A heat-insulated joint between two heat-insulated pipe units, each of said pipe units comprising:
- a pipe,an outer jacket of fluid-impervious material surrounding said pipe in coaxially spaced relationship therewith, and a filling of expanded heat-insulating material provided between said pipe and said outer jacket and extending over the greater part of the length of said pipe,the end parts of said pipe projecting beyond the corresponding ends of said filling and the end parts of said outer jacket projecting likewise but for a shorter distance, so that annular recesses are formed in the ends of the pipe unit,and said heat-insulated joint comprising;
means interconnecting proximate projecting end parts of the pipes of said two pipe units,annular seals of rubberlike material located in the annular recesses in the proximate ends of the two pipe units,each annular seal having an outer circumferential portion lying in contact with the radially inner surface of the projecting end part of the jacket of the respective pipe unit and an annular portion supported by at least the radially outer part of the end face of the filling of the respective pipe unit,a tubular cover extending across the gap between the proximate end parts of the jackets and having its ends joined to the outer circumferential portions of said annular seals, anda further expanding filling of heat-insulating foam material within the annular space enclosed by the seals and the cover and surrounding the interconnected pipe end parts,the outer circumferential portions of the annular seals being held by said further filling in fluid-tight sealing contact with the radially inner surfaces of the projecting jacket end parts and the annular portions of the annular seals being pressed by said further filling in fluid-tight sealing relation toward the end faces of the corresponding pipe units.
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Accused Products
Abstract
For use in heat-insulated pipe-lines produced from at least two heat-insulated pipe units joined end to end, each heat-insulated pipe unit consisting of a pipe surrounded over the greater part of its length by at least one layer of heat-insulating foam material which is in turn enclosed by an outer jacket of fluid-impervious protective material, the end parts of the pipe projecting beyond the corresponding ends of the layer or layers of heat-insulating material and the end parts of the jacket projecting likewise but for a shorter distance, so that annular recesses are formed in the ends of the pipe unit. The pipes of these two pipe units are interconnected end to end by a butt weld or mechanical jointing element between the projecting end parts thereof. Annular seals of rubber-like material are located in the annular recesses in the proximate ends of the two pipe units. A tubular cover extends across the gap between the proximate end parts of the jackets of the two pipe units in spaced coaxial relationship with the interconnected pipe end parts. The annular space or spaces enclosed by the seals and the cover and surrounding the interconnected pipe end parts are filled with heat-insulating foam material.
76 Citations
24 Claims
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1. A heat-insulated joint between two heat-insulated pipe units, each of said pipe units comprising:
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a pipe, an outer jacket of fluid-impervious material surrounding said pipe in coaxially spaced relationship therewith, and a filling of expanded heat-insulating material provided between said pipe and said outer jacket and extending over the greater part of the length of said pipe, the end parts of said pipe projecting beyond the corresponding ends of said filling and the end parts of said outer jacket projecting likewise but for a shorter distance, so that annular recesses are formed in the ends of the pipe unit, and said heat-insulated joint comprising; means interconnecting proximate projecting end parts of the pipes of said two pipe units, annular seals of rubberlike material located in the annular recesses in the proximate ends of the two pipe units, each annular seal having an outer circumferential portion lying in contact with the radially inner surface of the projecting end part of the jacket of the respective pipe unit and an annular portion supported by at least the radially outer part of the end face of the filling of the respective pipe unit, a tubular cover extending across the gap between the proximate end parts of the jackets and having its ends joined to the outer circumferential portions of said annular seals, and a further expanding filling of heat-insulating foam material within the annular space enclosed by the seals and the cover and surrounding the interconnected pipe end parts, the outer circumferential portions of the annular seals being held by said further filling in fluid-tight sealing contact with the radially inner surfaces of the projecting jacket end parts and the annular portions of the annular seals being pressed by said further filling in fluid-tight sealing relation toward the end faces of the corresponding pipe units. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A heat-insulated pipe unit comprising:
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a pipe an outer jacket of fluid-impervious material surrounding said pipe in coaxially spaced relationship therewith, and a filling of expanded heat-insulating material provided between said pipe and said outer jacket and extending over the greater part of the length of said pipe the end parts of said pipe projecting beyond the corresponding ends of said filling and the end parts of said outer jacket projecting likewise but for a shorter distance, so that annular recesses are formed in the ends of the pipe unit wherein annular supports are provided between the pipe and jacket at intervals along the length of said jacket, each annular support comprising; a collar of rubber like material stiffened by an internal fixedly mounted on the pipe and an outer annular cushioning ring of low density polyurethane foam material having its inner circumference joined to the outer circumference of the collar and its outer circumference presses against the interior surface of the jacket.
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Specification