Читать книгу Petroleum Refining Design and Applications Handbook - A. Kayode Coker - Страница 60
14.10 Line Symbols and Designations
ОглавлениеThe two types of lines on a flowsheet are (1) those representing outlines and details of equipment, instruments, and so on, and (2) those representing pipe carrying process or utility liquids, solids, or vapors and electrical or instrument connections. The latter must be distinguished among themselves as suggested by Figure 14.17d.
In order to represent the basic type of solution flowing in a line, designations or codes to assign to the lines can be developed for each process. Some typical codes are:
| RW | - River Water |
| TW | - Treated Water |
| SW | - Sea Water |
| BW | - Brackish Water |
| CW | - Chilled Water |
| S | - Low Pressure Steam |
| S150 | - 150 psi Steam |
| S400 | - 400 psi Steam |
| V | - Vent or Vacuum |
| C | - Condensate (pressure may be indicated) |
| D | - Drain to sewer or pit |
| EX | - Exhaust |
| M | - Methane |
| A- | - Air (or PA for Plant Air) |
| F | - Freon |
| G | - Glycol |
| SA | - Sulfuric Acid |
| B | - Brine |
| Cl | - Chlorine |
| P | - Process mixture (use for in-process lines not definitely designated by other symbols) |
Figure 14.17 (a) Special types of descriptive flowsheet symbols [9]. (b) Commonly used instruments flowsheets [9]. (c) Flow diagram symbols. Valves, fittings, and miscellaneous piping [9]. (d) Line symbols (By permission from ISA Std. S51—1973 and 1984).
Sometimes it is convenient to prefix these symbols by L to indicate that the designation is for a line and not a vessel or instrument.
