Page 156 - APPLIED PROCESS DESIGN FOR CHEMICAL AND PETROCHEMICAL PLANTS, Volume 1, 3rd Edition

140 Applied Process Design for Chemical and Petrochemical Plants

Flash Pressure, Z pslg
(Lower than either X or Y)

Vapor
_)

Condensate Flashing
From Various
Collection l
Headers
Liquid

--

Liquid Level

Condensate
Return to
"'-------------�----4 .. ��
Collection Tank
Figure 2-53. Typical steam condensate flashing operation.

psig. The calculated total equivalent length of pipe, 7. Refer to Figure 2-54 and note that required receiver
valves, and fittings is 600 feet. pressure is not shown, so calculate "factor scale" by
Using the Sarco chart, Figure 2-54, determine the rec- previous formula:
ommended line size for the return line.
Data: hp = 441 Btu/lb at 450 psig
I. Upstream steam pressure = 450 psig hr = 302 Btu/lb at 90 psig
2. Condensate load = 9,425 lbs/hr Lr = 886 Btu/lb at 90 psig
3. Return line pressure = 90 psig V = 4.232 cu ft/lb at 90 psig
4. Use the Sarco recommendation of 5,000 ft/min
5. Load factor
36.2 (4.232) (441 - 302)
"factor scale" value = = 0. 092
886 (441 - 180)
= (5,000) (100) = 53.0
9,425
8. Ft/min/100# /hr = 53 = 576
6. Receiver pressure = 90 psig 0.092