Abstract: The present disclosure relates to processes, methods, systems, and apparatus for steam cracking hydrocarbon in a pyrolysis furnace having a convection zone and a radiant zone. The convection zone includes three heat exchangers in series with a serpentine arrangement. A fluid source is disposed each heat exchanger to provide steam into the heat exchangers. The present disclosure further relates to a process of adjusting the stream flow rate for each fluid source to control operating conditions such as flue gas temperature, stack temperatures, and temperatures of other components of the furnace.

Abstract: A bracket and nut assembly includes a first bracket, a second bracket and a captured nut. The first bracket includes a body with first end having with an aperture extending therethrough. The second bracket includes a first end with an elongated aperture and a second end moveably attached to the body portion of the first bracket. A captured nut is retained within the elongated aperture. The nut includes a first piece coupled to a second piece and is axially translatable and rotatable within the elongated aperture.

Abstract: A bracket and nut assembly including a bracket having a first end and second end. The first end includes a first substantially planar portion spaced apart from and positioned substantially parallel to a second substantially planar portion. A third portion interconnects the first and second portions. A first aperture extends through the first portion and a second aperture extends through the second portion. The first and second apertures are axially aligned with one another. A nut includes a substantially cylindrical hollow body having flats, a first end and a second end. A flange radially extends from the first end. The flange is captured between the first portion and the second portion of the bracket such that the nut is operable to translate and rotate relative to the bracket.