EP 0447391 B1 19920826 - OBTURATING ELEMENT FOR SEALING A DEFECTIVE HEAT-EXCHANGER PIPE AND PROCESS FOR REMOVING SAID OBTURATING ELEMENT
Title (en)
OBTURATING ELEMENT FOR SEALING A DEFECTIVE HEAT-EXCHANGER PIPE AND PROCESS FOR REMOVING SAID OBTURATING ELEMENT
Publication
Application
Priority
DE 8800738 W 19881129
Abstract (en)
[origin: WO9006483A1] An obturating element (1) for sealing one end of a heat-exchanger pipe (2) consists of a hollow cylindrical part (3) which merges smoothly into a hollow conical part (4) and which has an outer diameter slightly smaller than that of the heat-exchanger pipe (2) to be sealed. The obturating element (1) is inserted in the heat-exchanger pipe (2) and expanded or rolled in order to bring it into sealing contact with the inner surface of the heat-exchanger tube (2). Means (6) for inserting a drawing tool (15) are mounted in the conical part (4). The cylindrical part (3) is roughened in the region which expands. In a process for removing the obturating element (1), a track (12a) is traced by welding along the wall of the element; as the wall shrinks, it retracts, thus releasing the obturating element (1).
IPC 1-7
IPC 8 full level
F28F 9/04 (2006.01); F28F 11/02 (2006.01)
CPC (source: EP)
F28F 11/02 (2013.01)
Designated contracting state (EPC)
CH DE FR LI NL SE
DOCDB simple family (publication)
WO 9006483 A1 19900614; DE 3874152 D1 19921001; EP 0447391 A1 19910925; EP 0447391 B1 19920826; EP 0447391 B2 19970108; ES 2017441 A6 19910201
DOCDB simple family (application)
DE 8800738 W 19881129; DE 3874152 T 19881129; EP 88909985 A 19881129; ES 8904076 A 19891129