In Chapter 4, Section 2, we discussed a variation in flooded reboiler design for low-boiling materials. As shown by Figure 4.4, we throttle the steam instead of the condensate. The static force-balance relationship is given by equation (4.1):

Sc 3c where

Hl = loop seal or standpipe height, feet Hs = condensate level in the shell, feet Pcs = steam pressure in shell, lbf/ft2 abs pL = condensate density, lbm/ft3

The vented loop seal maintains Ps just a little above atmospheric pressure. We can now write the following equations:

From equation (4.1), if we assume that the line loss APUne is negligible, and that HL pL — is constant, then:

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