| 摘要 |
<p>This invention comprises a door for gas-tight sealing engagement in an access opening in environments involving high temperature. In one embodiment, the door is a boiler access door (10) provided through a waterfall in a boiler, and includes a tapered insulation plug (62) for sealing engagement in a tapered opening in the waterfall. In a preferred embodiment, the tapered sides are stepped and the insulation comprises multiple layers (64, 66, 68, 70) which may be of different grades of insulation material. The stepped insulation defines a plurality of linearly aligned contact surfaces for engagement with a plurality of cooling tubes (30) defining the sides of the access opening.</p> |
