Vent Piping
CVHH-SVX001A-EN 37
Table 9. “C” values used to determine rupture disk vent
line sizes (lb/min); for use with
Figure 24, p. 38
NTON
Evap.
Size
( EVSZ)
Cond.
Size
( CDSZ)
“C” Values for Unit Com ponents
Total
“C”
Value Evap. Cond. Econ.
Oil
Tank
900–1200 100M 100M 112.0 48.4 40.7 18.5 4.5
900–1200 100L 100L 123.2 54.5 45.8 18.5 4.5
900–1200 130M 130M 122.4 54.0 45.4 18.5 4.5
900–1200 160M 200M 134.1 60.5 50.7 18.5 4.5
900–1200 200L 220L 160.4 75.4 62.1 18.5 4.5
900–1200 220L 220L 168.6 83.6 62.1 18.5 4.5
1500-1700 200L 200L 156.8 75.4 57.1 19.8 4.5
1500-1700 220L 220L 169.9 83.6 62.1 19.8 4.5
900–1200 100M 10HM 127.0 48.4 55.7 18.5 4.5
900–1200 130M 13HM 138.2 54.0 61.3 18.5 4.5
900–1200 160M 20HM 150.2 60.5 66.8 18.5 4.5
1500-1700 200L 20HL 174.9 75.4 75.2 19.8 4.5
1500-1700 220L 22HL 191.4 83.6 83.6 19.8 4.5
Notes:
1 . Rupture disk diam eter is 3 in. (76.2 m m).
2 . Use the total “C” value in
Figure 24, p. 38 to determine the vent line
pipe diameter.
3 . If piping m ultiple rupture disks (multiple units) to a comm on vent
line, first determine the total “C” value for each unit, and then; add
all “C” values together and apply the result to Figure 24, p. 38.
4 . The CVHH unit is a Sim plex chiller and has (1) refrigerant circuit and
(1) relief device.
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