| 摘要 |
The arrangement of a sight-glass (2) in the wall (1) of a container, which serves to take up reactive or flammable liquids or liquids otherwise damaging to health, represents a potential source of danger in the case of a glass breakage connected with an uncontrolled emergence of liquid. For this purpose, the sight-glass is covered in a sealing fashion with an outer cap. In the sight-glass arrangement according to the invention, the sight-glass (2) is received in a fully protected manner in a recess in a receiving body welded to the wall (1) of the container and is retained in this recess by means of a holding body. A threaded pipe element (16) is welded to the holding body, and carries on its end face a closure cap (17). By means of an axially extending groove (20) which is recessed in the outer surface of the threaded pipe element (16) and dimensioned to be longer than the outer thread serving to screw on the closure cap (17), a negligible emergence of liquid is allowed by a slight loosening of the closure gap (17) if the glass is broken, this indicating the defective sight-glass (2). <IMAGE>
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