Product Overview | Gas-Compress Air Torches
for soldering, brazing, welding ladles and crucibles dies
hand forging spot heating
PREHEAT
FIRING
Some users install an 1807 Limiting Orifice Valve between gas valve and torch so it can be wide open at high fire. In this case, for initial lighting, adjust the 1807 Valve from closed to appropriate high fire setting (with gas valve wide open). On subsequent lightings, ease the gas valve open along with the air, until it is full open (the 1807 is permanently set). Torch-type burners are designed to be used only for heating items in the open. They do not have provisions for the mounting of flame detection devices and other safety-related features required for the firing of closed or covered enclosures or vessels that contain the products of combustion and thus fall under the provisions of the NFPA 86 Standard for Ovens and Furnaces. When firing in the open, precautions are needed to protect personnel and property from the flame, heat and products of combustion generated. These precautions include but are not limited to items such as operating instructions appropriate to the specific task to which the torch is applied, operator training, a suitable ignition source, heat shields, clamps to hold the torch in the desired positions, safety ventilation, etc. Flexible hoses rated for the intended fuel service are required. Valves for remote fuel shut off and fuel flow limiting are recommended. The user assumes complete responsibility for all aspects of using portable torches.
The 4696 Torch is a packaged unit that uses 40-80 psi (2.7-5.5 bar) compressed air to inspirate combustion air into a chamber where it’s mixed with almost any gaseous fuel including Natural gas, Propane, or Butane and delivered to the burner nozzle. This creates a well-defined, high velocity premix flame that can be directed into relatively tight and deep chambers and is far more effective than a raw gas torch and has much more flexibility and a higher capacity than torches using high pressure gas inspirators. The inspirating mixer is very efficient, and only 10- 15% of the combustion air is from compressed air. 4696’s are used singly or in groups for a wide variety of industrial heating jobs. They can be very effective for specific requirements such as incinerator ignition, lighting a cupola coke bed, etc. The 4696 assembly includes gas and compressed air valves. Flexible hoses feeding torches increase their usefulness. Air register type nozzle mountings are available, see Bulletin 4682 LIGHTING 1. Initially, set the compressed air at about 10 psi 0.69 bar); 2. Put a lighting torch in front of the nozzle, and slowly open gas valve until burner lights. 3. Increase gas and air flows until desired high fire rate is achieved, 60 psi (4.1 bar) air is standard.
For a similar inspirator product that provides combustion air to 3065 mixers or nozzle mix burners, see Sheet 3070-1.
CAPACITIES with 60 psi (4.1 bar) air
Propane
Compress Air
Mixture P.^
Spud Drill Size
Natural Gas*
Torch
cfh 90 188 615
(M 3 /hr)
cfh
(M 3 /hr) cfm (M 3 /hr) "w.c. (mbar) Name
inch
(mm) (1.31)
4696-1-A 4696-2-D 4696-4-C 4696-6-C 4696-7-C
(2.5) (5.3)
38 79
(1.1)
2.3 3.4
(4) (6)
6 5 9 6 5
(15) (12) (22) (15) (12)
#55 #52 #34 #19
0.052 0.064
(2.2) (7.3)
(1.63) (2.82) (4.22) (5.18)
(17.4) (30.0) (47.3)
257 444 699
10 23 35
(17)
0.111
1060 1670
(12.6) (19.8)
(40) (60)
0.166 0.204
#6
* Minimum gas pressure is 1"w.c. (2.5 mbar) for natural gas. ^ Approximate mixture pressure at burner nozzle inlet at listed gas flow, actual mixture pressure will vary depending on the fuel/air ratio. Standard 4696 assemblies do not have a pressure tap location to read mixture pressure.
Bulletin 4696 page 2
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