Closure for a gas offtake pipe
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United States of America Patent
Stats
-
May 19, 1987
Grant Date -
N/A
app pub date -
Aug 5, 1985
filing date -
Aug 25, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A closure is provided for the top opening of a circular or oval cross section gas offtake pipe provided on the roof for a coke oven chamber to conduct gasses from the chamber to a gas main. The closure includes a domed top cover and an inner cover. The peripheral edge of the top cover dips into a water seal provided on the top edge of the gas offtake pipe when the cover is in a closed position. The edge of the inner cover engages a peripheral top sealing edge of an annular wall which is disposed at a distance from the water seal inwardly thereof. The top seal edge of the annular wall is disposed above a base of the water seal.
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