Technical Paper
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www.anchorsforrefractory.com
REFRACTORY ANCHORS by Virginie Thaulez Anchors have been used with monolithic
refractories for many years, they are used to hold refractories against the steel shell of furnaces and other structures, they were usually just V or Y anchors welded to the shell and were made from stainless steel for added strength at temperature.
In the last 25-30 years we have seen monolithics have become much more sophisticated with new ranges of material with low cement, ultra-low cement, no cement, self-flow and several additives to help resistance to metal penetration, however anchors have not changed much at all. There are times when no one actually takes ownership of the anchors. Is it the job of the refractory engineer or structural engineer, or even an anchor specialist to make improvements to the anchor system? There have been many occasions where all that has happened is new anchors have been supplied as were supplied in the original equipment. But with process temperatures increasing and furnace conditions changing, in incineration we are now burning much more plastic than we did 20 years ago, in other areas we are using alternative fuels such as chopped tyres, these give areas of chemical attack.
To help get the right type of anchor we should look at the shapes of stainless that are available:
• Flat bar • Round rods • Cold drawn wire
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Because of oxidation and corrosion, steel alloy anchors loose thickness with time. After loosing 1 mil, the % of material loss is 56% for the flat ones and 36% for diameter 10. Flat anchors lose cross section much faster than round anchors. The lifetime of a round anchor will be much longer than a flat anchors.
ENGINEER THE REFRACTORIES March 2018 Issue
Round or flat anchor - the lifetime of a round anchor will be much longer than a flat anchors
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