Page 376 - Analysis, Synthesis and Design of Chemical Processes, Third Edition

tower, return at 45–52°C (115–125°F); return seawater at 43°C (110°F); return tempered water
or steam condensate above 52°C (125°F).
10. Cooling air supply at 29–35°C (85–95°F); temperature approach to process, 22°C (40°F).
11. Compressed air 3.1 (45), 10.3 (150), 20.6 (300), or 30.9 barg (450 psi) levels.
12. Instrument air at 3.1 barg (45 psig), –18°C (0°F) dew point.
3
13. Fuels: gas of 37,200 kJ/m (1000 Btu/SCF) at 0.35–0.69 barg (5–10 psig), or up to 1.73 barg
3
(25 psig) for some types of burners; liquid at 39.8 GJ/m (6 million Btu/bbl).
14. Heat transfer fluids: petroleum oils less than 315°C (600°F), Dowtherms less than 400°C
(750°F), fused salts less than 600°C (1100°F), direct fire or electricity above 450°F.
15. Electricity: 0.75–74.7 kW. (1–100 hp), 220–550 V; 149–1864 kW (200–2500 hp), 2300–4000
V.

(Adapted from S. M. Walas, Chemical Process Equipment: Selection and Design, Stoneham, MA:
Butterworth, 1988. Copyright © 1988 by Butterworth Publishers, adapted by permission of Butterworth
Publishers, Stoneham, MA. All rights reserved)

References

1. Koen, B. V., Definition of the Engineering Method (Washington, DC: American Society
for Engineering Education, 1985).

2. Sieder, E. N., and G. E. Tate, “Heat Transfer and Pressure Drop of Liquids in Tubes,”
Ind. Eng. Chem. 28 (1936): 1429.

3. Walas, S. M., Chemical Process Equipment: Selection and Design (Stoneham, MA:
Butterworths, 1988).

Problems

For the ethylbenzene process shown in Appendix B, check the design specifications for the following
1. three pieces of equipment against the appropriate heuristics: P-301, V-302, T-302. Comment on any
significant differences that you find.

For the styrene process shown in Appendix B, check the design specifications for the following three
2. pieces of equipment against the appropriate heuristics: E-401, C-401, T-402. Comment on any
significant differences that you find.

For the drying oil shown in Appendix B, check the design specifications for the following three pieces

3. of equipment against the appropriate heuristics: V-501, P-501, H-501. Comment on any significant
differences that you find.