| 摘要 |
<p>PCT No. PCT/AU93/00506 Sec. 371 Date May 17, 1995 Sec. 102(e) Date May 17, 1995 PCT Filed Sep. 30, 1993 PCT Pub. No. WO94/07772 PCT Pub. Date Apr. 14, 1994A hatch in road or rail tanker (2) includes a hatch cover (7) mounted in a flange (8) of a compartment manhole (9). In order to prevent leaks from the hatch cover (7), a band (13) is welded to the top of the tank (2) around compartment manhole (9). The band (13) includes an outwardly concave flange (14) providing a groove for receiving a hatch sealing device (15). The hatch sealing device (15) includes a generally cylindrical rubber cylinder having an open end and a closed end closed by a seal membrane, also of rubber. Around the inside of the rim forming open end there is provided an internally extending lip shaped to fit into concave flange (14). Around the outside of the cylinder is provided a split ring of metal, the ends of which are drawn together in order to radially compress the cylinder and thus seal it around the flange (14).</p> |
