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Q Engine Exhaust Flow
m3/min.
cfm
28.3
1000
25.5
900
22.7
800
19.8
700
17.0
600
14.2
500
11.3
400
8.5
300
7.1
250
5.7
200
4.2
150
2.8
100
2.5
90
2.3
80
2.0
70
1.7
60
1.4
50
1.1
40
3
(cfm x 0.02832 = m
Figure 7-10 Back Pressure using Pipe Size 4 in., 152 m or Less
TP-6609 6/08
kPa per m
/min.)
Δ P Back Pressure
in. Hg per foot
1.033
1.0
0.515
0.5
0.104
0.1
0.052
0.05
0.009
0.01
0.005
0.005
0.001
0.001
0.001
0.0005
0.000
0.0001
0.000
0.00005
0.000
0.00001
(in. Hg x 3.387 = kPa)
d Pipe Diameter
mm
inches
25.4
1.0
31.8
1.25
38.1
1.5
44.5
1.75
50.8
2.0
63.5
2.5
76.2
3.0
88.9
3.5
101.6
4.0
114.3
4.5
127.0
5.0
(in. x 25.4 = mm)
Appendix 59
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