Abstract: A rotary coke cooling drum is formed of plural opposed folded plates welded together and having spaced apart openings for receiving an array of tubular cooling pockets which are separately formed and are insertable in the openings to provide heat transfer surfaces and auger flights for traversing material through the drum. The cooling pockets are formed by opposed trapezoidal shaped plate members which are welded to each other along mating edges leaving one end of the cooling pocket substantially open and the opposite end is closed over a major portion by an end cap and a short section of drain conduit adapted to project through the wall of the drum shell. The cooling pockets may each have a locating and mounting flange or doubler plate secured at the open end of the pockets and adapted to be welded to the wall of the drum shell. The pockets are easily inserted in and removed from the drum shell for repair or replacement as needed.

Abstract: A method for isolating a relief valve, the relief valve being positioned in fluid communication with a pressurized vessel by positioning a gate valve body between and in fluid communication with the relief valve and the pressurized vessel, the gate valve body including a plug and a cap positioned to sealingly close an opening in the gate valve body generally covered by a gate valve bonnet cover and yoke, removing the cap, sealingly positioning a sandwich valve over the opening in the gate valve so that when the pass-through is opened a passageway through the pass-through sandwich valve is generally co-axial with the opening in the gate valve, sealingly positioning a removable yoke over the passageway through the pass-through, the removable yoke including a stem and being adapted to movement of the stem through the removable yoke; opening the pass-through; moving the stem into engagement with the plug and removing the plug from the opening in the gate valve body; and positioning a valve gate on the stem and mo