Abstract: An automated top head cover and stem guide assembly adapted for covering a top opening in vertical vessels such as coking drums, and a method for remotely operating the assembly. The top head assembly includes a flanged connector unit attached pressure-tightly to a top flange opening of a coking drum and a top cover device including a cover unit pivotally attached to the flanged connector unit, so that the cover unit can be pivotally lifted and moved aside. A stem guide device is also pivotally attached to the top flange unit, so that a stem guide unit can be pivotally moved downwardly into place over the top flange unit opening, after a stem member is inserted into the vessel. Following coke removal from the drum, the stem member is withdrawn, the stem guide unit is pivotally moved upwardly, and the head cover unit is moved downwardly to cover the coking drum flanged unit. The invention also discloses method steps for operating the head cover and stem guide devices of the assembly.

Abstract: A securing nut apparatus for detachably connecting and clamping a machine component onto a shaft includes a nut hub body having a threaded main bore and a nut outer ring. The nut outer ring cooperates with the nut hub body threadably engaged to the shaft to provide a uniform clamping force to the machine component. A plurality of screws couple the nut outer ring with the nut hub body. A threaded engagement between the screws and threaded openings of the nut hub body forces the nut outer ring therebetween into a high uniform clamping force against the machine component.

Abstract: A safety relief valve having a disc carrier with a downwardly extending flange which overlaps an adjusting ring located on a valve seat member for providing a quicker full rated lift and shorter blowdown. The downwardly extending flange has a beveled end to form an orifice between the outer peripheral surface of the adjusting ring member for flowing media.