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Vent Piping
Figure 24. Rupture disk vent pipe sizing (IP units); for use w ith
1000
100
10
10
ASHRAE Standard 15
5
2
2
0.214d
(P
- P
)
0
2
L =
2
fC
R
Note: This figure, provided as a r efer ence, is based on ASHRAE St andard 15. Vent line size is t ypically dict at ed by st at e or local code which m ay be different
from ASHRAE St andard 15 requirem ent s.
•
L = equivalent length of discharge piping, feet
•
C
= rated capacity as stam ped on the relief device in
r
SCFM (conversion: lb/m in = SCFM * 0.0764)
C
= C value in lb/m in from
r
•
f = M oody friction factor in fully turbulent flow
•
d = inside diam eter of pipe or tube, in.
•
ln = natural logarithm
•
P
= absolute pressure at outlet of discharge piping, psi
2
(atm ospheric pressure)
38
Pipe siz e a s a Fu n ct ion of "C" Va lu e a n d Le n gt h of Ru n
L = Pipe Le n gt h ( Equ iv a le nt Fe e t )
( Fe e t x 0 .3 0 5 = M e t e r s)
d * ln(P
/ P
)
0
2
-
6f
Table 9, p. 37
Table 9, p. 37
100
•
P
= allow ed back pressure (absolute) at the outlet of
0
pressure relief device, psi
P
= (0.15 P) + atm ospheric pressure
0
Pipe Siz e ( I .D .)
fr ict ion fa ct or
6 NPS ( 150 DN)
6.06 in. ( 154 m m )
f= 0.0149
5 NPS ( 125 DN)
5.05 in. ( 128 m m )
f= 0.0155
4 NPS ( 100 DN)
4.03 in. ( 102 m m )
f= 0.0163
3 NPS ( 80 DN)
3.07 in. ( 78 m m )
f= 0.0173
1000
CVHH-SVX001A-EN
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