Pressure vessel closure device
First Claim
1. A coke drum deheading device comprising:
- a retaining element disposed concentrically around a lower end of the coke drum above a lower flange thereof;
a plurality of outwardly pivotable hooks depending from the retaining element;
a cradle releasably engageable by the hooks, the cradle adapted to hold a bottom head below the lower flange of the coke drum;
a plurality of springs mounted between the retaining element and the lower flange of the coke drum to tension the cradle upwardly to sealingly engage the bottom head against the lower flange of the coke drum;
a plurality of means adapted to move the retaining element toward the lower flange to tension the springs and to release tension from the hooks,a means for pivoting the hooks outwardly from the lower flange and disengaging the hooks from the cradle;
a means for raising and lowering the cradle and the bottom head to and from the lower flange of the coke drum.
1 Assignment
0 Petitions
Accused Products
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.
79 Citations
14 Claims
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1. A coke drum deheading device comprising:
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a retaining element disposed concentrically around a lower end of the coke drum above a lower flange thereof; a plurality of outwardly pivotable hooks depending from the retaining element; a cradle releasably engageable by the hooks, the cradle adapted to hold a bottom head below the lower flange of the coke drum; a plurality of springs mounted between the retaining element and the lower flange of the coke drum to tension the cradle upwardly to sealingly engage the bottom head against the lower flange of the coke drum; a plurality of means adapted to move the retaining element toward the lower flange to tension the springs and to release tension from the hooks, a means for pivoting the hooks outwardly from the lower flange and disengaging the hooks from the cradle; a means for raising and lowering the cradle and the bottom head to and from the lower flange of the coke drum. - View Dependent Claims (2, 3, 4, 5, 6, 13)
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7. A method for bottom deheading a coke drum, comprising the steps of:
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elevating a vertically moveable table positioned beneath the coke drum to engage and support a cradle and a bottom head of the coke drum, the cradle being held below the coke drum by a plurality of tensioned hooks depending from a hook retaining element disposed concentrically around a lower end of the coke drum and above a lower flange thereof and spring-biased upwardly from the lower flange and the bottom head being carried by the cradle in sealing engagement with the lower flange of the coke drum; moving the hook retaining element against the spring bias toward the lower flange to release tension from the hooks; pivoting the hooks outwardly to disengage the hooks from the cradle; and lowering the table with the cradle and bottom head supported thereon away from the lower flange of the coke drum. - View Dependent Claims (8)
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9. A method of closing a bottom head of a coke drum, comprising the steps of:
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elevating a vertically moveable table positioned below a lower flange of the coke drum and supporting a cradle having a plurality of hook receiving elements, the cradle carrying the bottom head, to position the bottom head against the bottom flange; inwardly pivoting a plurality of hooks depending from a hook retaining element disposed concentrically around a lower end of the coke drum and above the lower flange to position lower ends of the hooks for engaging the plurality of hook receiving elements of the cradle; spring-biasing the hook retaining element upwardly from the lower flange to tension the hooks and sealingly engage the bottom head against the lower flange; and lowering the vertically movable table away from the cradle. - View Dependent Claims (10, 11, 12, 14)
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Specification