OCR Text |
Show Refinery Heater Simulation by Hottel Zoning Hethod 21 The basic objective is to permit the user to rationally specify tube metallurgy and thickness for all sections of fired-heaters. The program will calculate : The force convection coefficient inside tubes for single or mixed phase flow using the RP530 recommended procedure. The radial temperature profile from bulk fluid to outside skin. Flux data needed for the box heater are generated by BXHTPGH. RP530 routines are utilized by the cylindrical program CYHTPGH and computed outside is printed. The design metal thickness for tubing or piping based on the specified metallurgy; e.g., new designs or replacement tubes. Also computes the maximum operating temperature for the as-built condition. The remaining life fraction, past damage, for existing units; retirement mode. The expected life for proposed operating conditions; i.e., revamp mode. The maximum permissible operating temperature for proposed operations specifying desired operating life and pressure data. The maximum permissible operating pressure for proposed operations specifying desired operating life and temperature data. In the design mode the program computes whether the tube operates in the elastic, rupture or a combination of both of these temperature ranges. It then computes the required thickness based on this information, or the minimum take-out thickness if that controls. In the retirement (past or future) mode it calculates rupture life; or, if in the elastic range, life based on the corrosion rate. c:\doc\hdspet\toc.wp August 24, 1989 |