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CVHE-SVN02D-EN

Table 7. “C” values used to determine rupture disc vent line sizes – CVHE, CVHF and CVHG

Evaporator Condenser “C” Values for Unit Components

Size Size Rupture Evaporator Standard Economizer Short Long Auxiliary With

(EVSZ) (CDSZ) Disc Condenser H.R. H.R. Condenser Free

(3) (4) Diameter Condenser Condenser Cooling

032S 032S 3" (76 mm) 26.25 18.87

032S 032L 3" (76 mm) 26.25 25.19 4.85 18.87 25.19 15.28 4.16

032L 032L 3" (76 mm) 35.04 25.19

050S 050S 3" (76 mm) 33.05 23.56

050S 050L 3" (76 mm) 33.05 31.45 7.44 23.56 31.45 15.28 6.16

050L 050L 3" (76 mm) 44.13 31.45

080S 080S 3" (76 mm) 45.59 29.06

080S 080L 3" (76 mm) 45.59 38.80 11.63 29.06 38.80 15.28 5.87

080L 080L 3" (76 mm) 60.86 38.80

142E 142L 3" (76 mm) 74.30 50.50 Design Design

Special Special

142M 142L 3" (76 mm) 58.47 50.50

142L 142L 3" (76 mm) 68.86 50.50 17.40 N/A* 50.50 15.28 7.10

210L 210L 3" (76 mm) 75.16 56.72 N/A*

250E 250L 3" (76 mm) 93.81 62.12 56.72

Notes:

1. To determine the total “C” value for a specific unit, add the appropriate “”C” values for the evaporator, standard condenser and economizer. If the unit is equipped

with any options (e.g., heat recovery, free cooling or an auxiliary condenser, add the applicable “C” values to this total. With this new sum, refer to Figure 13 to

determine the vent line pipe diameter.

2. If piping multiple rupture discs (multiple units) to a common vent line, first determine the total ”C” value for each unit, and then; add all “C” values together and

apply the result to the “vent pipe sizing chart” in Figure 13.

3. EVSZ = Evaporator Shell Size;

S = Short Shell

L = Long Shell

E = Extended Shell

M = Medium

4. CDSZ = Condenser Shell Size;

S = Short Shell

L = Long Shell

E = Extended Shell

*N/A = Not Available

Vent Piping