A durable layer, usually high-alumina brick or castable, placed between the working lining and the insulation or shell of a ladle, torpedo car or furnace. It is the last line of defense against a breakout and normally lasts through several working-lining relines. Crews inspect it at every tear-out, and metal or slag found in it is a warning sign.
Found metal fingers in the safety lining on 14 ladle, that one gets a full strip, not just a working reline.
Metal found in a safety lining is a near miss, not a curiosity. Write it up and find out how it got there.
Also heard as
- permanent lining
- backup lining
- safety layer
Related terms
Working lining
Innermost refractory layer in contact with the process, designed to wear and be replaced on a schedule.
Breakout
Escape of molten metal or slag through a failed lining and shell, the most dangerous refractory failure.
Tear-out
Demolition of a worn or failed refractory lining so a new one can be installed.
High-alumina brick
Alumina-silica brick with more than 45 percent alumina, graded in steps such as 50, 60, 70, 80 and 90 percent.