Tile Options | HiRAM ®
EXPANDED TILE OPTIONS
METAL TILES
To compliment the “classic” high velocity refractory tile, the HiRAM® burner family is now available with many standard tile options that previously were only available as engineered specials. Each tile option within a burner size has the same mounting plate diameter and tile length. See the tile dimension table for details. ORIGINAL “CLASSIC” REFRACTORY TILE The classic HiRAM® refractory tile has a reduced tile exit that produces a high velocity flame which improves temperature uniformity in the furnace. The tile geometry also protects burner internals from radiant heat and from melting furnace splash. They are made with 3000°F dense castable material and are suitable for furnace temperatures up to 2400°F. METAL JACKETED TILES Jacketed refractory tile options are available for applications where extra tile support is needed. Jackets are available with 304 or 309 stainless steel and are ½” larger in diameter than the classic refractory tile. The metal jacket is used as the outer form when the refractory is poured to make the tile, so the jacket fits very tightly around the refractory. The refractory used is the same as with the classic HiRAM® tile.
The HiRAM’s® stabilizer design allows the burner to be offered with a metal tile which contains no refractory. Its lightweight construction makes them ideal for applications like refractory drying or mounting on rotary dryers and calciners. They can be used as an alternative to the 4570 HiVAM® burners. The mounting plate is made from 304 stainless steel and the tile walls are available with 310 or 330 stainless steel.
Designation 4575- -M310 4575- -M330
Tile Material
Maximum Temp. 1800°F (982°C) 2000°F (1093°C)
310 SST 330 SST
MEDIUM VELOCITY TILES
Medium velocity burners have advantages when high velocity is not needed. They can be installed in narrower furnaces because lower velocity flames are less likely to impinge the opposite chamber wall, generally make less noise, and have lower air pressure requirements than high velocity burners. The velocity of the mixture exiting the tile will be 25-50% of the high velocity version. The medium velocity tiles used in the 4575-burner family have no exit restriction, so the tile backpressure and burner air pressure requirements are lower. A medium velocity 4575 operating at 9 osi air pressure will have about the same capacity as the high velocity burner at 16 osi. To avoid over firing medium burners, consider high fire as 9-12 osi and do not operate with a main air pressure over 16 osi (27.7" w.c., or 6.9 kPa). Because medium velocity tile exits are completely open, the burner internal parts have less protection from the thermal radiation in the furnace. To protect burner internal parts from heat damage, do not set air pressure below 1 osi in a 1800°F furnace, or below 2 osi at 2100°F (whether gas is on or off).
When installed the jacket must be protected with enough insulation so as not to exceed the rated temperature. The maximum temperature rating for jacket metals depends upon frequency of heat-up/ cool-down cycles. As an example, batch annealing furnaces that are heated and cooled every day should use the "intermittent exposure" ratings. Continuous annealing furnaces that remain at the same temperature for months at a time, can run 100°F hotter.
Intermittent
Designation 4575- -J304 4575- -J309
Jacket Metal
exposure
304 SST 309 SST
1500°F (816°C) 1800°F (982°C)
Bulletin 4575 Page 4
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