| 摘要 |
The invention relates to a method for drawing off liquid, in particular, transformer oil, characterised in comprising the following steps: A) application of a magnet (2) to the external surface of the wall (1) of the liquid reservoir, comprising a drilling (3), the axis of which is perpendicular to said wall (1), B) fixing a piercing and withdrawing device (4) to said external surface, comprising a guide (5), crossed axially by a drilling (6) which is arranged within the axis of the drilling (3) of the magnet (2), said guide (5) comprising a plug (7), moving between an open position which releases the passage in the drilling (6) of the guide (5) and a closed position which seals said passage, C) the drill (9) of a piercing tool (10) is introduced into the drilling (6) of the guide (5) then into the drilling of the magnet (2), D) said wall (1) is broached by means of the drill (9), E) the drill (9) and the piercing tool (10)are withdrawn and F) the plug (7) is put in the closed position. |
