the piping drawings.
Figure 14.18 Examples of line numbering.
Figure 14.19 Use of alphabetic suffixes with line symbols.
Figure 14.20a Line schedule.
Figure 14.20b Pipe line list.
Figure 14.20c Line schedule sheet.
Figure 14.20d Line summary table.
Suggested guides for line identification for any one principal fluid composition:
1 1. Main headers should keep one sequence number (Figure 14.18).
2 2. New sequence numbers should be assigned:(a) Upon entering and leaving an item of equipment.(b) To take-off or branch lines from main headers.(c) To structural material composition of line changes.
3 3. Alphabetical suffixes should be used in the following situations as long as clarity of requirements is clear, otherwise add new sequence numbers.(a) For secondary branches from headers or header branches.(b) For by-pass lines around equipment, control valves, etc. Keep same sequence number as the inlet or upstream line (Figure 14.18).(c) For identical multiple systems, piping corresponding identical service items, and lines.
In order to coordinate the process flowsheet requirements with the mechanical piping specifications, Line Schedules are prepared as shown in Figures 14.20a through d. The complete pipe system specifications are summarized by codes on these schedules.
Equipment code designations can be developed to suit the particular process, or as is customary a master coding can be established and followed for all projects. A suggested designation list (not all inclusive for all processes) for the usual process plant equipment is given in Table 14.4 and process functions in Table 14.5. The various items are usually numbered by type and in process flow order as set forth on the flowsheets. For example:
Table 14.4 A system of equipment designations.
| AD | - Air Drier |
| AF | - Air Filter |
| Ag | - Agitator |
| B | - Blower |
| BR | - Barometric Refrigeration Unit |
| C | - Compressor |
| CP | - Car Puller |
| CT | - Cooling Tower |
| CV | - Conveyor |
| D | - Drum or tank |
| DS | - Desuperheater |
| E | - Heat Exchanger, condenser, reboiler, etc. |
| Ej | - Jet Ejector |
| Ex | - Expansion Joint |
| F | - Fan |
| FA | - Flame Arrestor |
| Fi | - Filter (line type, tank, centrifugal) |
| GT | - Gas Turbine |
| MB | - Motor for Blower |
| MC | - Motor for Compressor |
| MF | - Motor for Fan |
| MP | - Motor for Pump |
| P | - Pump |
| PH | - Process Heater or Furnace |
| R | - Reactor |
| S | - Separator |
| St | - Strainer |
| ST | - Steam Turbine |
| Str | - Steam trap |
| SV | - Safety Valve |
| Tr | - Trap |
| V | - Valve |
| VRV | - Vacuum Relief Valve |
| Item Code | Represents |
| C-1a | Three compressors of identical size operating in the same process service, connected in parallel. |
| C-1b |
