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Coking vessel unheading device and support structure

  • US 5,947,674 A
  • Filed: 07/19/1996
  • Issued: 09/07/1999
  • Est. Priority Date: 07/19/1996
  • Status: Expired due to Term
First Claim
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1. An unheading device for a vertical vessel and adapted for being removably supported from a separate support structure for the vessel and removably attached onto a lower flanged opening of the vessel, the device comprising:

  • (a) a head unit including a head cover plate fixedly attached onto a cover/cradle skid, said head cover plate being adapted for removable attachment onto a lower flanged opening of the vertical vessel;

    (b) a lifting frame unit adapted for supporting the cover/cradle skid of said head unit and for vertically moving the head unit, said lifting frame unit including a vertically extendible chute unit attached to the lifting frame unit lower side;

    (c) multiple elongated generally vertically oriented extendible actuator means each actuator being pivotally attached at its lower end to a corner of said lifting frame unit, each said extendible actuator means being pivotally attached at its upper end to a separate stationary support structure for the vessel; and

    (d) a cover/cradle skid unit including dual horizontal actuators adapted for moving said head unit from the lifting frame unit laterally to a side parking location on a stationary platform portion of the vessel separate support structure relative to said vessel lower flanged opening, whereby the head unit and its lifting frame unit can be controllably lowered by the multiple vertical-extendible actuators which are each pivotably attached at its upper end to the vessel separate support structure and moved aside by the dual horizontal actuators for the cover/cradle skid unit so as to permit removing accumulated material through the lower flanged opening of the vertical vessel and the extendible chute unit, after which the head unit can be returned laterally, lifted and the cover plate reattached pressure-tightly to the vessel lower flanged opening.

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