Pneumatic placement of refractory. In dry gunning, the dry mix is conveyed by air and water is added at the nozzle; in wet gunning, or shotcrete, a pre-mixed castable is pumped and set with an accelerator at the nozzle. Gunning builds new linings fast without forms and is the standard hot repair for BOFs, EAFs, ladles and cement kilns. Quality depends heavily on the nozzleman and on keeping rebound out of the lining.
Book the gunning crew for the converter between heats, the trunnions are getting thin.
Also heard as
- gun
- gunned refractory
- gunite
- hot gunning
Related terms
Shotcrete
Wet-mix gunning: castable pumped through a hose and set instantly by accelerator added at the nozzle.
Rebound
Material that bounces off the wall during gunning instead of sticking, wasted and often harmful.
Nozzleman
Operator who handles the gunning nozzle and controls water and placement on a gunning or shotcrete crew.
Gunite
Shop name for gunned refractory and the dry-gun process, borrowed from the concrete trade.