Page 36 - APPLIED PROCESS DESIGN FOR CHEMICAL AND PETROCHEMICAL PLANTS, Volume 1, 3rd Edition

Process Planning, Scheduling and Flowsheet Design 21

Compressors

�
Horizontal, Motor-Driten Steam -Driven Vertica I , Motor - Driven Vertical, Motor-Driven Rotary Blower Motor-Driven

& Motor Driven Sump Pump loo Steam Driven
Turbine Driven
Centrifugal Compressor
Reciprocating Pump
�
fu Engine Driven Pump � Vertical Centrifugal � Motor Driven
Reciprocating Pump
(G = Gas or D = Diesel)
Pump with Motor
¢ Rotary Pump � Turbine Driven � Motor Driven
Centrifugal Pump
Centrifugal Pump
Figure 1-20A. Special types of descriptive flowsheet symbols.

--111-- Orifice P!ate Diaphragm Operated Butterfly Valve 0- Pilot Light
-ffi- Orifice Plate in Quick Change Fitting Diaphragm Operated Angle Valve 6-- Data to Computer

Venturi Tube or Flow Nozzle· 0- Computer Set
Self-Contained Regulating Valve
Pitot •ube or Pitot Venturi Tube
Double Diaphragm Control Valve Relay Function Designations
Types
Turbine or Propeller Type Element
Hydraulic or Pneumatic Piston L = Add
Operated Control Valve
Rotameter D = Subtract
Rotary Motor Operated Control Valve + = Bias
Rotameter with Integral
Throttle Valve � = Extract Square Root
Solenoid Operated Gate Valve
Chemical Seal = Divide
Rupture Disc for Pressure Relief Three-Way Solenoid Valve 0 = Multiply
Latch Type With Manual Reset
I : j = Booster
Rupture Disc for Vacuum Relief
Multiple Orifice Plate � = !-ligh Select
Pressure O' Safety Valve g) = Low Select
0- Locally Mounted Instr. R E V Rev = Reverse
Vacuum Relief Val�e
Vac. "t' Press. Pressure and vacuum relief Valve e- Main Panel Mounted Instr. EI P E/P = Potential to Pneumatic
(Conservation Vent)
� e-- I/ P 1/P = Current to Pneumatic
Float Operated Valve (LCV) Local Panel Mounted Instr. E / I Ell = Potential to Current
0- Instr. Mounted Behind Panel Figure 1-208. Commonly used
Hand Control Valve instruments for process instrumenta-
tion flowsheets. Adapted by permis-
CX)-
Diaphragm Operated Control Valve Instr. with Two Functions sion, ISA Std. ANSI ¥32.20-1975,
FC = Fail Closed. FO = Fail Open ISA SS.1-1973, "Instrumentation
Diaphragm Operated Control Valve Gb- Heat Traced Instr. Symbols and Identification," Latest
with H andwheel S = Steam. E = Electric edition, 1984.