What is gunning in refractory?

What is gunning in refractory?

Refractory Gunning Mixes or Refractory Gunning Masses are produced from granular refractory materials and applied by spraying on area with an air placement gun. It is mainly used for patching and maintenance applications for furnaces.

What is refractory shotcreting?

Sometimes it is also called shotcreting. It is a process or technique which involves pumping of refractory guniting refractory mixes under high pressure through a hose to a nozzle (spray-gun) and then spraying them at high velocity onto a surface either by dry-mix or by wet-mix process.

What is a refractory installation?

Installing the Refractory Lining After consulting with the hired refractory contractor, industrial refractory installation is conducted. This process is the mixing of a certain amount of water with a fixed amount of refractory castable. If not, the incorrect amount of water can spoil the refractory lining.

What is gunning material?

Gunning materials are unshaped refractories commonly used in steel industry for the maintenance of converter linings. Their specific way of processing (projection of a water/powder mixture unto a hot slag-covered wall) (Fig. 4, 5 Moreover, slag splashing after gunning was shown to increase the lifetime of repair.

What is gunning mix?

Gunning mix is a type of paste applied to metals, plastics, wood or masonry as a repair compound. These products were also called asbestos paste.

What is gunting in civil engineering?

Guniting is a process used in construction for the application of slope stabilization and certain rehabilitation purpose mainly in the construction of retaining walls, swimming pool construction, tunnel construction, in fluid tank construction and some of the concrete repair works.

What is the difference between gunite and shotcrete?

For gunite, water is added to the dry concrete mix at the gun-shaped nozzle opening (hence the name “gunite”). Shotcrete is different in that it is trucked to your property wet in a cement truck. The water and dry mix are combined prior to arrival and shot out of a nozzle premixed and ready to go.

What is pipe Guniting?

Guniting is most widely used method for fireproofing of pipes. The methods lightweight cements, prefabricated cementitious board & intumescent coatings are used in less critical areas and where weight reduction is of significant benefit.

Why is refractory lining necessary?

Refractory lining is basically a protective layer installed inside the furnace to protect the steel structure from high temperatures. Refractory bricks or monolithic refractories can be used for refractory lining. A professionally placed lining will increase the lifetime of the furnace and lower the energy costs.

What are the significance of lining of refractory in a furnace?

A modern blast furnace (BF) is refractory lined to protect the furnace shell from the high temperatures and abrasive materials inside the furnace. The refractory lining is cooled to further enhance the protection against the dispatch of excess heat that can destroy the refractory lining.

What is guniting in refractory lining?

The guniting process has grown into an important and widely used technique for the maintenance of refractory lining. Guniting process due to its method of placing results into positive adhesion to any applied surface and, due to its density ensures a good repair of the damaged refractory lining.

What are the advantages of Gunning monolithic refractories?

Conventionally methods for gunning a monolithic refractory have been used in places where lining is difficult by casting or stamping. Gunning methods have such merits as no lining mold is needed, thereby enabling cost reduction, high working efficiency and easy hot lining and are therefore widely used.

How is refractory lining lined?

Usually while laying the refractory lining, the surface of the tank, made up of metal needs to be free from mill scale, rust, dirt and other impurities. The surface of the metal is then sandblasted and the layer of refractory lining is applied directly on the metal.

What is guniting in a furnace?

Guniting is a process used for the hot repair of the refractory lining which get damaged during the operation of the furnace. It is an important process which is frequently used for enhancing the refractory lining life of the furnace.