tailieunhanh - Standard Handbook of Engineering Calculations Episode 10

Tham khảo tài liệu 'standard handbook of engineering calculations episode 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | CHEMICAL AND PROCESS PLANT ENGINEERING SECTION FIVE Ã L FIGURE 6 Graphical solution for steam-tracing design. Chemical Engineering. Related Calculations This procedure can be used to design steam tracing for a variety of tanks and vessels used in chemical petroleum food textile utility and similar industries. The medium heated can be liquid solid vapor etc. As with the previous calculation procedure this procedure is the work of Carl G. Bertram Vikram J. Desai and Edward Interess the Badger Company as reported in Chemical Engineering magazine. DESIGNING STEAM-TRANSMISSION LINES WITHOUT STEAM TRAPS Design a steam line for transporting a minimum of X 105 lb h X 105 kg h and a maximum of X 105 lb h X 105 kg h of saturated steam at 205 lb in2 gage and 390 F 1413 kPa and C . The line is 3000 ft m long with eight 90 elbows and one gate valve. Ambient temperatures range from -40 to 90 F -40 to C . The line is to be designed to operate without steam traps. Insulation 3-in thick with a thermal conductivity of Btu-in h-ft2- F W m-K will be used on the exterior of the line. Calculation Procedure 1. Size the pipe by using a suitable steam velocity for the maximum flow rate. The minimum acceptable steam velocity in a transmission line which is not fitted with steam traps is 110 ft s m s . Assuming for safety purposes a steam velocity of 160 ft s m s to use in sizing this transmission line compute the pipe diameter in inches from d p LV2 AP where f friction factor for the Downloaded from Digital Engineering Library @ McGraw-Hill Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. CHEMICAL AND PROCESS PLANT ENGINEERING CHEMICAL AND PROCESS PLANT ENGINEERING in cm max. steam out FIGURE 7 Steam-traced vessel bottom. Chemical Engineering. pipe assumed p density of the steam lb ft3

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