Page 267 - Mechanical Engineers' Handbook (Volume 4)

256 Furnaces

Figure 34 Pressure drop in velocity heads for flow of air or flue gas through orifices, elbows, and
lateral outlets. 1

Staggered Tubes Tubes in Line Factor F for x/D
x/D Factor F y/D 1.5 2 3 4
1.5 2.00 1.25 1.184 0.576 0.334 0.268
2 1.47 1.5 1.266 0.656 0.387 0.307
3 1.22 2 1.452 0.816 0.497 0.390
4 1.14 3 1.855 1.136 0.725 0.572
4 2.273 1.456 0.957 0.761