Combustion Catalog | Fives North American

Capacities | High Pressure Inspirator

TABLE 3. FACTORS FOR RICH OPERATION AND FOR OTHER GASES % air gas spud area thru capacity and mixture Btu/ft 3 sp gr ft 3 air/ft 3 Inspirator factor press. factor 800 0.54 5.8 100 0.68 1.36 90 0.56 1.65 80 0.47 2.00 70 0.38 2.44 1000 0.6 10.0 90 0.83 1.21 80 0.67 1.50 70 0.53 1.90 1200 0.7 11.7 100 1.25 0.85 90 1.03 1.02 80 0.83 1.28 70 0.66 1.60 gas specifications

Example: Non-standard selection. Inspirator to supply 80% air for 300 cfh of 20 psi 1000 Btu/ft 3 gas.

standard drill is #44 with 0.00581 sq. in. area. Therefore, specify a 3070-4 Inspirator with #44 spud drill. To find actual mixture pressure, multiply 1.64 × 1.50 = 2.46"w.c. Propane and butane does not inspirate as much air in a 3070 mixer as high pressure natural gas. To use propane, butane, or low-pressure gases in an open-air torch, see Bulletin 4696 “Gas- Compressed Air Torches”

In Table 1, read a 0.67 capacity factor and a 1.50 spud and mixture pressure factor. The required 300 cfh capacity × 0.67 = 201 cfh equivalent capacity. In the left half of Table 1, look down the 20 psi gas pressure column until you find a gas flow near 201 cfh. 192 cfh corresponds to a 3070-4 50 tentative inspirator size and drill designation and 1.64"w.c. tentative mixture pressure. The last number means #50 spud drill, which has 0.00385 sq. in. area (from any drill size table). Multiply this by the spud area factor, 0.00385 × 1.50 = 0.00578 sq. in. The next larger

TABLE 4. COMBUSTION AIR CAPACITIES, CFH FOR NORTH AMERICAN PREMIX BURNERS (sold separately see Bulletin 4682) For nozzle capacity in Btu/h HHV, assuming 100% air through the nozzle, multiply figures below by 100. Nozzle can be run rich at air rates below, using secondary air to complete combustion of the exess fuels.

Burner Air Flow scfh

Burner Air Flow scfh

Mixture Pressure in inches of water

Burner

Burner

Mixture Pressure in inches of water

Size

1

2

3

4

Size

1

2

3

4

-0-A -0-B -0-C -1-A -1-B -2-A -2-B -2-C -2-D -3-A -3-B -4-A -4-B -4-C

200 250 280 350 440 560 650

280 350 400 490 620 790 920 1100 1240

340 430 490 600 760 960 1120 1340 1510

390 500 570

-5-A -5-B -6-A -6-B -6-C -7-A -7-B -7-C -8-A -8-B -8-C -8-D

2450 2900 3200 3850 4250 4750 6000 7050 10500 13000 18000

3450

4220

4900 5800 6400 7700 8500

4100 5000

4510

5500

700 880 1120 1300 1560 1760 1960 2400 3000 3800 4100

5450 6600

6000

7300

6700 8500

9500

8450 10300 12000

780 880 980 1200 1500 1900 2050

9950 12100

14100

14800 18200 21000 18400 22500 26000 25500 31200 36000

1380

1690

1690 2060

21500 30200 37200 43000

2120

2580

-9-D

37700 53000 65000 75500

2680 3280

2890

3530

4651-01 4651-0

130 250

183 350

225 433

260 500

Bulletin 3070 Page 4

Made with FlippingBook flipbook maker