Trane Technologies CVHE - Page 30

Figure 15. Rupture disc vent pipe sizing
Pipe size as a Function of “C” Value and Length of Run
10
100
1000
10 1000
"C" Value
6 NPS
Pipe Size (I.D.)
friction factor
(6.065)
f=0.0149
4 NPS
100
L = Pipe Length (Equivalent Feet)
(Feet x .348 = Meters)
(4.026)
f=0.0163
3 NPS
(3.068)
5 NPS
f=0.0173
(5.048)
f=0.0155
ANSI/ASHRAE Standard 15-2007
fC
2
R
L=
.214d
5
(P
2
0
- P
2
2
)
-
6f
d * ln(P
0
/ P
2
)
P
0
= (0.5 * 15) + P
2
P
2
= 14.7 psia
f= Moody Friction Factor in fully turbulent flow
Note: This chart, provided as a reference, is based on ASHRAE Standard 15-2007. Vent line size is typically dictated by state or local code which
may be different from ASHRAE Standard 15-2007 requirements.
30 TCVHE-SVX04D-EN
Vent Piping
RELEASED 10/Mar/2020 06:59:20 GMT