High blast torches use a small amount of high pressure air to entrain incoming gas at the mixer. This produces a hard, sharp, clear blue, typical blast burner flame. Only ten percent of the total air required is at 20 to 100 psi. This air is passed through a high pressure venturi which inspirates the gas flow and elevates its pressure. The resultant mixture of one part air and one part gas is delivered to the main orifice at approximately 40% of the inlet air pressure. The venturi efficiently entrains large quantities of combustion air and delivers the mixture to the burner nozzle. The high pressure air valve and primary air shutter provide for wide ranges of adjustment. The design of high pressure injector stage prevents air feedback into the gas line. Capacities listed in the table on page 2 of the Product Specifications PDF are for 90% primary air and may be increased where adequate secondary air is available.
GAS CAPACITY AND AIR CFM MULTIPLIER TABLE
AIR
PRESSURE
20
25
30
35
40
45
50
55
60
65
70
80
90
100
FACTOR
0.71
0.79
0.87
0.94
1.00
1.06
1.12
1.18
1.23
1.28
1.32
1.42
1.50
1.58
Note:
Multiply gas and air capacities by factor for air pressure.
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