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V V e e n n t t P P i i p p i i n n g g
ASHRAE Standard 15
–15
5
7.4381x10
d
(P
L =
2
fC
R
•
L = equivalent length of discharge piping, meters
•
C
= rated capacity as stamped on the relief device
r
in SCFM (conversion: kg/s = SCFM * 0.0764 / 132.28)
C
= C C value from the preceding table (convert C
r
in kg/s to lb/min for IP; lb/min = (kg/s) / 132.28)
44
2
2
– P
)
d * ln(P
/ P
0
2
0
–
500f
•
f = Moody friction factor in fully turbulent flow
•
d = inside diameter of pipe or tube, mm
)
2
•
ln = natural logarithm
•
P
= absolute pressure at outlet of discharge piping,
2
kPa (atmospheric pressure)
•
P
= allowed back pressure (absolute) at the outlet
0
of pressure relief device, kPa
P
= (0.15 P) + atmospheric pressure
0
CVHH-SVX001G-EN
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