Heat resistance steel anchor claw to fix industrial Furnace Lining Refractory Structure,refractory brick.

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Proper anchor selection and installation is one of the foundations to help assure a successful refractory installation project.

For example,one consideration is the coefficient of thermal expansion of the anchor material, which will be higher that the refractory material, thus the stresses produced can result in lining cracking and eventual failure of the refractory material and also the anchor. It is suggested that all anchors be coated with a material (bitumen) that will burn out at low temperature and allow very small movement between the anchor and castable lining to accommodate the differential expansion.

Over 60% of structural monolithic refractory failures are caused by the contractor’s (or design engineer’s) lack of understanding of proper anchor design and installation.



Refractory Anchors

The early twentieth century monolithic refractories were commonly plastic. At that time brick was still the predominant refractory material. The refractory plastic was “anchored” by ramming into pockets created in common brick walls.



Now,anchor Selection

Proper anchor system designs should take into consideration the following:



Type of refractory (plastic, castable, etc.)

Installation technique (gunite, cast, rammed, etc.)

Lining configuration (single, dual, multiple, etc.)

Operating and interface temperatures

Geometry of the vessel

Joints, penetrations, etc.



Metallic (alloy) anchors

Cast iron (usually good up to 1000°F)

Fabricated stainless steel (good to about 2100°F depending upon grade)

Ceramic Tile Anchors (can withstand over 3000°F)

Wall support systems – castings and fabricated stainless steel

With metallic anchor systems the fabricated anchors are primarily used for castables and gunned/shotcrete refractory. There are several types of configurations but predominantly a “V” type shape is used.

An experienced refractory contractor should consider all of these important factors and offer the best anchoring system for your application.