To prevent a small plastic refractory wall patch repair from falling into the furnace of a boiler, you should __________.
⢠Properties of plastic refractory in high-temperature boiler furnaces ⢠How mechanical support and bonding keep a small repair in place ⢠Standard brickwork preparation for refractory patching
⢠Think about what happens to a small, thin patch when the furnace heats up and cools down repeatedly. What will keep it from loosening and dropping out? ⢠Consider how masons usually prepare old refractory or brick before applying any new material. Do they rely more on surface bonding, on added metal, or on shaping the cavity? ⢠Ask which option would most directly improve the way the new patch keys into (locks into) the existing refractory, rather than just sitting on the surface.
⢠Which choice most improves the mechanical keying or locking of the patch into the surrounding brickwork? ⢠Which option is actually a standard refractory repair practice, rather than an improvised idea (like mixing dissimilar materials)? ⢠Does any option introduce materials (like extra metal or concrete) that could expand differently than the refractory and cause it to crack or loosen?
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