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Refractory Dry-Outs

Newly built or repaired refractory lined furnaces generally require a start-up under controlled conditions. This involves a gradual step by step heating of the furnace that is in compliance with the manufacturers’ specifications. This process may take many days. Once completed, the furnace can begin normal operations.

The mixing of many refractory castable linings involves water. The addition of water is undertaken in order to produce a workable compound that can be pumped and molded during the application process. This material, once applied to the furnace, needs to be “Dried Out”.

Heating of the material in an uncontrolled way may cause spalling. This is the result of the pressurisation of entrapped steam in the lining. Spalling is a fragmentation or flaking of the lining and effectively may be a shortening of the predicted life of the refractory material.

An effective dry out procedure, and one carried out in compliance with the manufacturers’ specification, is the key to ensuring that a furnace operates to both the manufacturers’ specification and the operators’ expectations.

National Heat has over ten years of experience undertaking refractory dry outs for many clients around Australia. We can provide the right equipment, experienced staff and the expertise to assist in the construction of new equipment or to prepare repaired furnaces for effective operation.

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