Engineering Data | HiRAM ® Medium Velocity
Main Air Pressure, osi/"w.c./mbar
4575-12
0.2 0.3 0.9
1
4
9
16
osi "w.c. mbar
1.7
6.9 17.2
15.6
27.7
with MV tile
4.3
39
69
Main Air Flow, not burning, scfh (Nm 3 /h) Main Air Flow, burning, stoich., scfh Main Air Flow, burning, stoich, Nm 3 /h Gas Pressure, stoich, "w.c. (mbar) Gas Pressure, 10% excess air, "w.c. (mbar) Maximum %XSAir with flame signal (UV)
—
—
—
—
231 000 (6175)
20 990
48 940
100 500
151 100 (4039)
208 350
(561)
(1308)
(2686)
(5569)
0.1 (.25) 0.1 (.25)
0.8 (2.0) 0.75 (1.9)
4.0 (10.0) 3.2 (8.0)
8.0 (19.9) 7.0 (17.4)
13.5 (33.6) 12.3 (30.6)
800
2500
2000
1400
1200
Maximum %XSFuel
30
30
30
30 — —
30 — —
Maximum %XSAir, ignition--pilot
800 800
2500 2500
600 600
Maximum %XSAir, ignition--direct spark
Flame Length, stoich., ft. (Meter) Flame Diameter, stoich., in. (mm)
9.0 (2.7) 48 (1219)
11.0 (3.4) 38 (965)
13.0 (4.0) 36 (914)
14.0 (4.3) 36 (914)
14.0 (4.3) 48 (1219)
Main Air Pressure, osi/"w.c./mbar
4575-14
0.2 0.3 0.9
1
4
7
9
osi "w.c. mbar
1.7
6.9 17.2
12.1
15.6
with MV tile
4.3
30
39
Main Air Flow, not burning, scfh (Nm 3 /h) Main Air Flow, burning, stoich., scfh Main Air Flow, burning, stoich, Nm 3 /h Gas Pressure, stoich, "w.c. (mbar) Gas Pressure, 10% excess air, "w.c. (mbar) Maximum %XSAir with flame signal (UV)
—
—
—
—
314 000 (8393)
36 000
93 400
181 000 (4838) 2.0 (5.0) 2.0 (5.0)
252 000
297 000 (7939) 4.0 (10) 4.0 (10)
(962)
(2497)
(6736)
0.0
0.0 0.0
3.6 (9.0) 3.5 (8.7)
-0.1 (-.25)
1500
1500
1500
1250
1250
Maximum %XSFuel
30
30
30
30
30 — —
Maximum %XSAir, ignition--pilot
1500
1500 200
1500 — 400 —
Maximum %XSAir, ignition--direct spark
100
Flame Length, stoich., ft. (Meter) Flame Diameter, stoich., in. (mm)
10 (3.0) 36 (914)
14 (4.3)
17 (5.2)
17 (5.2)
19 (5.8)
48 (1219)
60 (1524)
60 (1524)
60 (1524)
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 10
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