| 摘要 |
A method for counteracting axial migration of moisture in a foam insulation layer (4) of a thermally insulated transport tube (1 ) comprises the steps of: providing an area (L) of the transport tube where the foam insulation layer is absent; arranging a shrinking sleeve (40) around said area, wherein this shrinking sleeve (40) has a larger axial length than said area and overlaps at each side with an outer tube (2) extending around said foam insulation layer; making said shrinking sleeve shrink by heating, so that the axial ends of the shrinking sleeve clamp around said outer tube; if desired, welding the axial ends of the shrinking sleeve to said outer tube; filling the annular space defined between the transport tube and the shrinking sleeve with a hardening substance (70), The material of this substance is chosen to be, at least after hardening, watertight and adhere well to the transport tube, to the shrinking sleeve, and to the foam insulation layer. |
