Capacities | HiRAM® Burners
ATOMIZING AIR REQUIREMENTS High tile pressures create the superior velocities of HiRAM Burners; these pressures also create an atomizing air requirement of 22 osi/38“w.c/95 mbar (at the burner) when burning oil, to realize at least 16 osi drop across the atomizer at high fire. When burning gas, atomizing air pressure can be same as main air pressure.
Main Air Capacities* scfh (Nm 3 /h) (burning on stoichiometric ratio)
Main air pressure drop across the burner, osi/"w.c./mbar
osi "w.c. mbar
0.2 0.35 0.9
1 1.7 4.3
4 6.9 17.2
9 15.6 39
16 27.7 69
Burner Designation
Natural Gas
4100 (110) 4980 (133) 10 900 (291) 10 600 (283) 12 000 (321) 12 00 (321) 11 300 (302) 10 900 (291) 18 200 (486) 18 200 (486)
12 500 (334)
27 000 (722) 29 000 (775) 43 250 (1156) 42 000 (1123) 53 000 (1417) 53 000 (1417) 62 000 (1657 68 500 (1831) 71 500 (1911) 82 500 (2205
45 000 (1203) 44 000 (1176) 64 800 (1732) 66 100 (1767) 76 000 (2031 83 500 (2232) 89 500 (2392) 101 000 (2700) 105 000 (2807) 122 000 (3261)
63 000 (1684) 61 000 (1631) 85 900 (2296) 91 200 (2438) 104 000 (2780) 106 000 (2833) 125 000 (3341) 129 000 (3448) 155 000 (4143) 151 000 (4036)
6575-8-B
#2 Oil
9700 (259
Natural Gas
20 200 (540) 17 900 (478 26 600 (711) 26 600 (711) 27 800 (743) 21 200 (567) 40 700 (1088) 40 700 (1088)
6575-9
#2 Oil
Natural Gas
6575-10-A
#2 Oil
Natural Gas
6575-10-B
#2 Oil
Natural Gas
6575-12
#2 Oil
* Not including atomizing air, which adds 3-5% to main air flow (see box above.)
Total Air Capacities scfh (Nm 3 /h) Main air + Atomizing air at burner
Air P. = 16 osi/27.7"w.c./69 mbar Air P. = 22 osig/38"w.c./95 mbar
Burner Designation
Burning #2 oil stoic. ratio Not Burning (for blower sizing)
6575-8-B
65 000 (1737) 94 300 (2521) 112 000 (2994) 134 000 (3582) 160 000 (4277)
84 000 (2245) 101 000 (2700) 151 000 (4036) 183 000 (4892) 213 000 (5693)
6575-9
6575-10-A 6575-10-B
6575-12
Dual Fuel HiRAM Characteristics
Flame length with stoichiometric ratio, Fuel pressure and Excess air limits j Natural Gas Operations #2 Oil Operation k
Main Air P. @ 4 osi/ 6.9"w.c./17.2 mbar
Main Air P. @ 16 osi/ 27.7"w.c./69mbar
Main Air P. @ 4 osi/ 6.9"w.c./17.2 mbar
Main Air P. @ 16 osi/ 27.7"w.c./69mbar
Oil P. psi (mbar) 1.8 (120) 2.2 (150) 2.3 (200) 2.9 (200) 3.9 (270)
Burner Designation
Flame L feet (M) 4.0 (1.2) 6.5 (2.0)
Excess air %
Flame L feet (M) 6.0 (1.8) 8.0 (2.4) 8.0 (2.4) 10.0 (3.0) 8.0 (2.4)
Excess air %
Gas P. "w.c. (mbar)
Flame L feet (M) 6.5 (2.0) 7.0 (2.1) 7.0 (2.1) 9.5 (2.9) 9.0 (2.7)
Excess air %
Flame L feet (M) 7.5 (2.3) 9.0 (2.7) 9.0 (2.7) 10.0 (3.0) 9.5 (2.9)
Excess air %
6575-8-B
750
700 500
19.5 (49) 15.0 (37) 15.6 (39) 16.4 (41) 14.9 (37)
450 150 200 200 220
750 225
6575-9
1000 1000
6575-10-A 6.0 (1.8) 6575-10-B 8.5 (2.6)
1200
1000 1000 1500
800
850
6575-12
7.0 (2.1)
2500
4000
Bulletin 6575 Page 3
Do not operate fuel rich.
May produce smoke and/or noxious fumes in cold chambers below 1400 °F (760 °C).
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