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Direct Spark Oil Ignition Adjustments
Table 11 Pilot Orifice Schedule

TM-5-3895-374-24-2 M081 Asphalt Mixing Plant Manual
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TM 5-3895-374-24-2 Table 10 Gas Burner Orifice Sizing Information (See pages 32, Fig.  33 for side orifice detail.) (A) orifices are not generally used  on  natural  gas  for  higher ratings  of  On/Off,  Low-High-Off,  Low-High-Low  units  or any ratings of modulating units as the butterfly functions as a variable orifice.  Modulating LP.  gas units require a properly sized limiting orifice. (B) Approximate pressure for  initial  start-up.    Final  pressure should be determined after checking actual flow with gas meter.      Stack   temperature.      CO/2,   O/2   and   firebox pressure  will  help  in  determining  actual  input  when  gas meter is not available for this unit. Consideration  should  be  given  to  magnitude  of  furnace  pressure. Furnace pressure must always be added to above orifice pressures, which are based on neutral furnace pressure. Burners  equipped  with  optional  adjustable  premix  tubes will   provide   flows   shown   at   slightly   lower   pressures. Most    fixed    premix    tubes    will    require    slightly    higher pressures.  When available supply pressure is too low to provide  above,  orifice  may  be  enlarged  or  removed  and proper adjustment made on gas pressure regulator. (page  3  - 985)







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