| 摘要 |
<p>Pipe for feeding a hot medium into an oil containing layer for ensuring normal working and reduction of heat losses has two walls separated by a heat insulating material. To allow for expansion at the connecting of the inner pipes when a hot medium is passed through, an inner pipe is welded by means of a disc to the corresponding outer pipe, whilst the end of the other inner pipe can slide along the inner wall of the other inner pipe with which it is loosely connected. A metal sleeve, which is only welded on to the inner wall of the outer pipe serves to hold the heat insulating material, and a second sleeve which is only screwed in the outer pipe serves to fix heat insulating material in that pipe during assembly and fitting in the drill hole of the conveying system. The heat insulating material is fitted in the circular space between the coupling joint of the outer pipes and the wall of the inner pipe.</p> |
