Abstract: Refractory material in wet slurry form is applied onto the inner surface of a furnace. The improvement is characterized in that the water to be added into the powder-like refractory material for producing the above slurry refractory material is finely and accurately regulated so that the resultant refractory material sprayed from the spray nozzle fixedly adheres onto the abraded or eroded portion of the inner surface of the furnace with a minimum amount of rebound loss.

Abstract: In an apparatus which applies refractory material in either wet or dry form onto the inner surface of a furnace by means of a spray pipe, a rotating mechanism for rotating the spray pipe is provided with an automatic oscillating device for automatically effecting a continuous oscillation of the spray pipe, the continuous oscillation improving the operability of the spraying operation while uniformly applying an optimal amount of refractory material onto the inner surface of the furance.

Abstract: In an apparatus of this invention which applies refractory material in either wet or dry form onto the inner surface of a furnace, the improvement is characterized in that all the devices inevitable for the lining operation including an operator's seat are effectively mounted on the transport car thereof which can be steered readily in any direction around the furnace.Due to the above construction, the lining apparatus of this invention can conduct the spraying operation with great mobility and reliability.

Abstract: A gunning apparatus for repairing a furnace lining is provided with a spray pipe of non-circular hollow cross-section. The spray pipe of non-circular cross section slidably moves back and forth within a rocking sleeve by a slide mechanism while the spray pipe is non-rotatable relative to the slide mechanism and is rotatable only by the rotation of the slide mechanism, whereby the shooting pipe is manipulated without weakening the rigidity or strength thereof which usually occurs on a conventional circular shooting pipe which requires keyways for rotation thereof.