Abstract: An ascension pipe for coke oven installations wherein the inner periphery of the pipe is lined with refractory brick and wherein a tube of heat-resistant steel covers the inner periphery of the brick lining. Only minor deposits form on this tube during operation of the coke oven. These deposits can be removed easily by vertically-guided scrapers without damaging the refractory, in contrast to prior art ascension pipes wherein the deposits must be removed from the refractory bricks themselves.

Abstract: A gas conduit control system for a coking oven provides for sequential operation of a conduit cover and a seal on a transition element which communicates between the conduit and a gas collection main conduit. The system includes two pivotally connected shafts and two bell crank levers wherein the cover element is connected to one bell crank lever and the seal is connected to the other bell crank lever. One bell crank lever is slotted to permit linear movement of a first shaft without accompanying movement of the associated bell crank lever. The other bell crank lever is pinned to a lengthwise slot in a second shaft to permit lengthwise movement of the second shaft without accompanying movement of that bell crank lever. A hydraulic piston is an element of the first shaft which operates the system by extension and retraction.

Abstract: An elbow cover for a coke oven ascension pipe characterized in that the opening which is covered is oval in shape and is formed at the junction of the ascension pipe and a downwardly-extending supply pipe leading to a gas-collecting main. The oval-shaped cover is provided with an immersion cup seal and a spaced sealing plate. Because of the oval shape of the opening, cleaning tools can be readily inserted into the opening to clean both the ascension pipe as well as the supply pipe.