Engineering Data | HiRAM ® Medium Velocity
Main Air Pressure, osi (inch w.c.)
4575-8-B MV
0.2 (.35)
1 (1.73)
4 (6.9)
9 (15.6) 16 (27.7)
Main Air Flow, not burning, scfh Main Air Flow, burning, stoich., scfh Maximum %XSAir with flame signal (UV)
—
—
—
—
104 000 92 000
8550
21 400
44 300
68 900
350
900
1 000
800
700
Maximum %XSFuel
30 5.0 24 0.1 0.1
30
30
30
30
Flame Length, stoich., ft. Flame Diameter, stoich., in. Gas Pressure, stoich., in. w.c.
6.0
8.6 32 2.7 2.4
8.0 36 6.1 5.8
9.0
40
36
0.6 0.6
11.0 9.9
Gas Pressure, 10% excess air, in. w.c. Maximum %XSAir, ignition--pilot Maximum %XSAir, ignition--direct spark
350 350
900 900
1 000 1 000
— —
— —
Main Air Pressure, osi (inch w.c.)
4575-12 MV
0.2 (.35)
1 (1.73)
4 (6.9)
9 (15.6) 16 (27.7)
Main Air Flow, not burning, scfh Main Air Flow, burning, stoich., scfh Maximum %XSAir with flame signal (UV)
—
—
—
—
231 000
20 990
48 940
100 500
151 100 208 350
800
2 500
2 000
1 400
1 200
Maximum %XSFuel
30
30
30
30
30
Flame Length, stoich., ft. Flame Diameter, stoich., in. Gas Pressure, stoich., in. w.c.
9
11
13
14
14
48 0.1 0.1
38
36
36
48
0.8
4.0 3.2
8.0 7.0
13.5 12.3
Gas Pressure, 10% excess air, in. w.c. Maximum %XSAir, ignition--pilot Maximum %XSAir, ignition--direct spark
0.75
800
2 500 2 500
600 600
— —
— —
xx800
Main Air Pressure, osi (inch w.c.)
4575-14 MV
0.2 (.35)
1 (1.73)
4 (6.9)
7 (12.1)
9 (15.6)
Main Air Flow, not burning, scfh Main Air Flow, burning, stoich., scfh Maximum %XSAir with flame signal (UV)
—
—
—
—
314 000
36 000
93 400
181 000 252 000 297 000
1 500
1 500
1 500
1 250
1 250
Maximum %XSFuel
30
30
30
30
30
Flame Length, stoich., ft. Flame Diameter, stoich., in. Gas Pressure, stoich., in. w.c.
10
14
17
17
19
36
48
60 2.0
60
60
0.0
0.0 0.0
3.6 4.0
Gas Pressure, 10% excess air, in. w.c. Maximum %XSAir, ignition--pilot Maximum %XSAir, ignition--direct spark
-0.1
2.0 3.5 4.0
1 500
1 500
1 500 —
—
100
200
400 — —
Medium Velocity (MV) HiRAM burners vs. Original High Velocity (HV) HiRAM
The medium velocity tiles available for the 4575-burner family have no tile exit restriction, so the velocity of the flame exiting the tile will be 25-50% lower than a standard 4575 burner with a high velocity tile. This also means that the tile backpressure and burner air pressure requirements are much lower. A medium velocity 4575 operating at 7-10 osi air pressure will have the same capacity as the high velocity burner at 16 osi.
To estimate performance for the 4575 MV burners not listed above: — MV burner air capacity at 9 osi = HV burner at 16 osi air pressure
— MV burner flame length = 30% longer than HV burner at the same capacity — MV burner gas pressure = 50% lower than HV burner at the same capacity — Excess air, lighting, and flame supervision limits should be the same as HV burner at the same capacity
Bulletin 4575 Page 9
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