Dimensions | Radiant Tube Gas Burners
BLOWER SIZING Because the primary air adjustment may be opened to 40%, the blower should have 117% (from Table 1b) of the rated total burner capacity. FLAME SUPERVISION Refer to Bulletin 8832, page 3, for choices of flame detectors Example. Select gas piloted radiant tube burners for an instal- lation requiring 350,000 Btu/h HHV gross heat release in each tube, with 8 osi air pressure across the burners. Glow pilots are desired. The tube backpressure is estimated to be 0.1 osi. Solution. To allow for possible adjustment of primary air to 20% for best heat-distribution in the tubes, divide the required capacity by 87.5% (from Table 1b). Capacity to use for burner selection = 350,000 0.875 = 400,000 Btu/h HHV. and adapters. SELECTION
From Table 1a, select 4725-4-G Burners which are rated at 410,000 Btu/h HHV with 8 osi air. Capacity to use for blower selection = 4100 cfh 1.17 number of burners. From Table 2, the minimum combustion air supply pressure for glow pilots should be 0.3 + 0.1 backpressure = 0.4 osi. From Table 3, the minimum gas supply pressure should be 0.06 8 osi air pressure = 0.48 osi. ORDER MUST SPECIFY 1 — Burner Designation: 4725 2 —Size: -2, -3, -4, -5, -6 3 —Ignition System: E, G, or M For example, a typical complete designation would be "4725-3-G".
DIMENSIONS inches
Mounting flange gasket†
Gas connection on either side B –NPT C C
Mating flange, by customer
H A –NPT Air connection
G
Radiant tube, by customer suggested diameter " U "
Air adjusting screw
R –B.C.
D
45°
F
Q dia.
P °
1 /
16 "
S –dia.
J
Observation port
N
4725- -G
7⁄16 " drill 4-holes
Gas adjustment
½ " NPT pilot mixture (4725- -G & -M) K M
E –dia.
L
T –dia.
†Mounting flange gasket is not part of the burner and must be ordered separately. See Page 4 for part number.
Burner
Wt,
dimensions in inches and degrees
N P° Q R S
designation
A B C D
E
F
G
H
J
K
L
M
T U
lb
4725-2-E, -G or -M 1 ¼ 1 4725-3-E, -G or -M 1 ½ 1
1 ½ 1 ½
4 4
5 7⁄8 1 5⁄16 5 7⁄8 1 5⁄16
3 3⁄8 3 3⁄8 4 1⁄16 4 1⁄16 4 1⁄16
6 3⁄16 6 3⁄16
4 5⁄8 4 5⁄8 5 ¾ 5 ¾ 5 ¾
20 20
8 13⁄16 6 ¼ 8 13⁄16 6 ¼
30 3 7 3 23⁄32 30 3 7 3 23⁄32 40 4 9 5 23⁄32 40 5 9 5 23⁄32 40 5 9 5 23⁄32
8 4 8 4 10 6 10 6 10 8
30 30 50 60 60
½ ½
4725-4-E, -G or -M 2 1 ¼ 1 9⁄16 4 15⁄16 7 ½ 1 11⁄16
7
22 7⁄8
9 7⁄8
5 9⁄32 5 9⁄32 5 9⁄32
9⁄16 9⁄16 9⁄16
4725-5-E, -G or -M 2 ½ 1 ½ 1 5⁄8
4 15⁄16 7 ½ 1 11⁄16 5 15⁄16 7 ½ 1 11⁄16
8 1⁄16 8 1⁄16
25 11 25 11
4725-6-E
3 1 ½ 1 5⁄8
"Q" diameter across ribs, add ¼ ".
DIMENSIONS SHOWN ARE SUBJECT TO CHANGE. PLEASE OBTAIN CERTIFIED PRINTS FROM FIVES NORTH AMERICAN COMBUSTION, INC. IF SPACE LIMITATIONS OR OTHER CONSIDERATIONS MAKE EXACT DIMENSION(S) CRITICAL.
WARNING: Situations dangerous to personnel and property may exist with the operation and maintenance of any combustion equipment. The presence of fuels, oxidants, hot and cold combustion products, hot surfaces, electrical power in control and ignition circuits, etc., are inherent with any combustion application. Components in combustion systems may exceed 160°F (71°C) surface temperatures and present hot surface contact hazard. Fives North American Combustion, Inc. suggests the use of combustion systems that are in compliance with all Safety Codes, Standards, Regulations and Directives; and care in operation.
Bulletin 4725 Page 3
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