Answer:

There is no single answer. There are several possible reasons that we can number as being responsible for the appearance of these cracks:

- Lining compaction inappropriate

- Segregation of the lining

- Loss of thin through the coil

- Hanging of the lining from the pan

 

What can happen?

Most likely metal infiltration and as a result the furnace should be demolished immediately.

 

What to do?

Analyse how it has been possible that it has been formed together with the supplier of the lining.