North American 4950 Flame Grid Engineering Data
Sheet 4950-3
Air Capacity – Air pressure drop across burner can be varied for 0.3"w.c. to 2.0"w.c. As pressure drop increases, flame changes from long yellow to short blue.
Gas Capacity – depends on gas pressure drop and port drill size. Standard port size is #46 drill and should be used wherever possible. Manufacturing problems prohibit smaller ports, but larger ones can be furnished on request. Maximum port size depends on gas tube length.
For good distribution, minimum gas port pressure drop is 0.7"w.c. The highest drop consistent with good flame stability is 3 psi.
The table below lists natural gas capacities for maximum and minimum port sizes and various gas pressure drops. Other capacities can be obtained with intermediate port sizes and/or pressure drops. To determine required gas line pressures, add gas train drops.
Flow of natural gas (0.6 sp gr), cfh, with gas port pressure drop of:
Burner
0.7"w.c.
Gas port
designation
drill size
(min.)
1.0"w.c.
3 psi (max.)
4950-0812
46 min B max 46 min 9 max 46 min 15 max 46 min 24 max 46 min 15 max 46 min 24 max 46 min 29 max 46 min 33 max 46 min 29 max 46 min 33 max 46 min 29 max 46 min 33 max
230
270
2500 21000 3600 21000 4350 21000 6100 21000 8600 42000 12200 42000 15800 42000 21700 42000 31600 84000 43300 84000 63200 168000 86600 168000
1930
2310
-1212
330
390
1930
2310
-1412
400
480
1930
2310
-2012
560
670
1930
2310
-1424
790
940
3850
4600
-2024
1120 3850 1450 3850 1990 3850 2900 7700 3980 7700 5800 15400
1340 4600 1730 4600 2380 4600 3470 9200 4760 9200 6940 18400
-2624
-3624
-2648
-3648
-5248
-7248
7960
9500
15400
18400
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