Pressure vessel closure device
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United States of America Patent
Stats
-
Jul 20, 1993
Grant Date -
N/A
app pub date -
Nov 1, 1991
filing date -
Nov 1, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
There is disclosed a flange or pressure vessel closure device and method for deheading a coke drum. The coke drum deheading device has an annular retaining element spring biased from a lower flange of a coke drum, and a plurality of hooks which extend from the retaining element to engage a cradle holding the bottom head against the flange. When it is desired to disengage the head from the flange, the hook retaining element is moved by a first set of cylinders toward the flange to release tension from the hooks so that they can be disengaged from the bottom head by pivoting them outwardly using a second set of cylinders or other hook pivoting means. The bottom head can then be disengaged from the flange, lowered and moved laterally away from the coke drum on a hydraulic table.
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