Page 37 - Applied Process Design for Chemical and Petrochemical Plants Volume I

Process Planning, Scheduling and Flowsheet Design 25

C -2 Single compressor in different service (by incineration, vent, and cooling tower waters and number
fluid OT compression ratio) from C-1's above. all like process items within that system, for example:
S - First separator in a process Reactor System, R Reactor is
1
S-2 Second separator in a process Reactor vent cooler is RE-1
S-3a Twoi entical separators connected in Reactor vent condenser is RE-2
S-3b parallel, in same process service. Reactor recycle pu
Level control

Some equipment code systems number all items on Then, establish the same concept for all other unit or
first process flowsheet with 100 series, as C-101, C-102, P- block processing systems. This is often helpful for large
106 to represent compressors number 101 and 102 in dif- projects, such as refinery or grass roots chemical processes.
ferent services and pump 406 as the sixth pump on the Valve identification codes are usually used in prefer-
sheet. The second sheet uses the 200 series, etc. This has ence to placing each valve specification on the flowsheet.
some engineering convenience but is not always clear This latter method is feasible for small systems, and is most
from the process view. workable when a given manufacturer (not necessarily the
same manufacturer for all valves) can be selected and his
To keep process 'continuity clear, it is usually best to
number all like items sequentially throughout the process, valve catalog figure number used on the flowsheet. For
with no concern for which flowsheet they appear on. Also, large jobs, or where many projects are in progress at one
another popular numbering arrangement is to identify a time, it is common practice to establish valve specifications
system such as reaction, drying, separation, purification, for the various process and utility services (see Figures 1-25
and 1-26) 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 wherever these valves
Table 1-2
A System of Equipment Designations

AD - Air Drier
AF- Air Filter Table 1-3
Ag - Agitator Typical Identification for Howsheet Process hnctians
B - Blower
BR - Barometric Refrigeration Unit AS-Air Supply
C - Compressor BD-Blowdown
CP - Car Puller BF-Blind Flange
CT- Cooling Tower CBD-Continuous Blowdown
CV - Conveyor
D - Drum or tank CD-Closed Drain
DS - &superheater CH-0-Chain Operated
E - Heat Exchanger, condenser, reboiler, etc. CSQ-Car Seal Open
Ej - Jet Ejector CSC-Car Seal Closed
Ex- Expansion Joint DC-Drain Connection
F-Fan EBD-Emerg. Blowdown Valve
FA- Flame Arrestor ESD-Emerg. Shutdown
Fi - Filter (line type, tank, centrifugal) FC-Fail Closed
GT - Gas Turbine
MB - Motor for Blower FO-Fail Open
MC - Motor for Compressor HC-Hose Connection
MF - Mctor for Fan IBD- Intermittent Blowdown
MP -- Motor for Pump LO-Lock Open
P - Pump MGManuai Loading
PH - Process Heater or Furnace NC-Normally Closed
R - Reactor. NO- Normally Open
S - Separator OD- Open Drain
St - Strainer P- Personnel Protection
ST - Steam 'Tuibine QO- Quick Opening
Str - Steam trap
SV - Safety Valve SC- Sample Protection
Tr - Trap SO-Steam Out
V - Valve TSO-Tight Shut QfF
VRV - Vacuum Relief Valve VB-Vacuum Breaker