Sheet 6435-3 Page 3
6435-3 – 800°F Main Air, Cold Atomizing Air
Main Air Pressure, osi
Burning Natural Gas
0.2
1
4
9
16
26
Main air, scfh, stoich.
200 120 450
545
1200 1840 2470 3370
Atom. air, scfh at 8 osi, stoich. †Total air, scfh, stoich. Gas flow, stoich., scfh Gas pressure, stoich., osi Flame length, in., stoich. Flame diameter, in., stoich. Tile pressure, osi, stoich. Max. %XSAir ‡Stability and flame supervision
110
110 100
90
40
785
1440 2070 2690 3540
45 0.1
79
144 207 269
354
0.5
1.6
3.2
5.7
10 13
4 2
6 2
8 2
11
12
2
2
2.5 7.0
0.01
0.35
1.14
2.3 4.15
100 100
300 300
400 400 400 400 400 400
400 400
‡Ignition--pilot
Max. %XSFuel
30
30
30
30
30
30
Burning #2 Oil
0.2
1
4
9
16
26
Main air, scfh, stoich.
210 260 600 0.43
540 270 940 0.68
1220 1860 2520
3390
Atom. air, scfh at 30 osi, stoich.
280
290 280
270
†Total air, scfh, stoich. Oil flow, stoich., gph
1630 2280 2930
3790
1.16
1.63
2.1 1.6
2.7 1.9
Oil pressure, stoich., psi Flame length, in., stoich. Flame diameter, in., stoich. Tile pressure, osi, stoich.
0.6
0.8
1.1
1.4 10
5 2
7
9 2
12
12
2.5 0.3
3
3
3
–0.05
1.33
2.45 4.05
6.7
Max. %XSAir ‡Stability and flame supervision
10 10 25
75 75 25
250 250
400 400 400 400
400 400
‡Ignition--pilot
Max. %XSFuel
25
25
25
25
The external metal temperatures recorded with neutral furnace pressure and in a cold chamber with preheated air were as follows:
Metal temperatue, F
Body
Preheat Air (Main Air temperature, F (near flange) Inlet Flange) Backplate 400 260 250 240 600 370 370 350 800 490 410 460 Body
† Total air is main air plus atomizing air plus 130 scfh for pilot air. ‡ Honeywell Ultravision Flame Detector C7027A and Honeywell Flame Supervision Protectorelay RA890G yielded 1.5 micro amps or greater for all above rates.
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