Petroleum Refining Design and Applications Handbook. A. Kayode Coker
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| Item Code | Represents |
| C-1a | Three compressors of identical size operating in the same process service, connected in parallel. |
| C-1b | |
| C-1c | |
| C-2 | Single compressor in different service (by fluid or compression ratio) from C-1’s above. S-1 First separator in a process |
| S-2 | Second separator in a process |
| S-3a | Two identical separators connected in parallel, in the same process service. |
| S-3b |
Some equipment code systems number all items on first process flowsheet with 100 series, as C-101, C-102, P-106 to represent compressors number 101 and 102 in different services and pump 106 as the sixth pump on the sheet. The second sheet uses the 200 series, etc. This has some engineering convenience but is not always clear from the process view.
To keep process continuity clear, it is usually best to number all like items sequentially throughout the process, with no concern for which flowsheet they appear on. Also, another popular numbering arrangement is to identify a system such as reaction, drying, separation, purification, incineration, vent, and cooling tower waters and number all like process items within that system for example:
Table 14.5 Typical identification for flowsheet process functions.
| AS | - Air Supply |
| BD | - Blowdown |
| BF | - Blind Flange |
| CBD | - Continuous Blowdown |
| CD | - Closed Drain |
| CH-O | - Chained Operated |
| CSO | - Car Seal Open |
| CSC | - Car Seal Closed |
| DC | - Drain Connection |
| EBD | - Emerg. Blowdown Valve |
| ESD | - Emerg. Shutdown |
| FC | - Fail Closed |
| FO | - Fail Open |
| HC | - Hose Connection |
| IBD | - Intermittent Blowdown |
| LO | - Lock Open |
| ML | - Manual Loading |
| NC | - Normally Closed |
| NO | - Normally Open |
| OD | - Open Drain |
| P | - Personnel Protection |
| QO | - Quick Opening |
| SC | - Sample Protection |
| SO | - Steam Out |
| TSO | - Tight Shut Off |
| VB | - Vacuum Breaker |
| Reactor System, R: | Reactor is RD-1 |
| Reactor vent cooler is RE-1 | |
| Reactor vent condenser is RE-2 | |
| Reactor recycle pump is RP-1 | |
| Level control valve is RLC-1 | |
| Relief valve is RSV-1 |
Then, establish the same concept for all other unit or block processing systems. This is often helpful for large projects, such as refinery or grass roots chemical processes. Valve identification codes are usually used in preference to placing each valve specification on the flowsheet. This latter method is feasible for small systems, and is most workable when a given manufacturer (not necessarily the same manufacturer for all valves) can be selected and his valve catalog figure number used on the flowsheet. For large jobs, or where many projects are in progress at one time, it is common practice to establish valve specifications for the various process and utility services (see Figures 14.21 and 14.22) by manufacturers’ catalog figure numbers. These are coded as V-11, V-12, V-13, etc., and such code numbers are used on the flowsheets whenever these valves are required (also see Figures 14.8 and