| 摘要 |
<p>According to the present invention there is provided an apparatus for forming a plug in a passageway, the apparatus comprising a carrier which in use is lowered into the passageway, the carrier comprising an elongate body of a material resistant to creep which supports first and second spaced apart portions that are a sliding fit in the passageway; a body of material supported on the carrier, said material having a melting point which is higher than the temperature within the passageway and which expands as it solidifies; and a removable heater operative to melt the body of material such that melted material fills a space defined between the first and second portions.</p> |
