Block RepairAs the plug wears, so does the block, and repairs to the block should be done at plug change. While we do not recommend using a block unless ½ the plug is covered, blocks can be safely repaired above this level. The block can either be gunned over a dummy or sacrificial plug, or in some cases a repair mix is dropped over the plug. The dummy plug is removed and installation of a new plug is as usual. The reason we don't' use a block unless ½ or more is present, is that usually there is not enough material to hold the plug in the proper position. The reason we prefer a dummy plug is that these plugs expand under heat, and can crack while sitting in a hot ladle waiting for repair. The blocks should always be inspected for excessive cracks and repaired with good mortar or plastic before installing the plug. Page 13 |
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