This document provides a standard drafting symbols chart for SA Water Process and Instrumentation Diagrams (P&IDs). It covers symbols for line types, self-actuated regulating valves, actuators, piping valves, fittings, general instrument functions, level sensors, primary element flow rate, and piping hazardous classification levels.
Source: TS-112-Process-and-Instrument-Diagrams.pdf · page 16/27 · Drawing: 4003 - 00001 - 01 rev 1 · Components: 87 (24 equipment, 19 instrument, 25 valve, 10 line, 9 other)
| Tag | Description | Details | Connects to |
|---|---|---|---|
| diaphragm | Diaphragm | Actuator | — |
| diaphragm-pressure-balanced | Diaphragm, Pressure Balanced | Actuator | — |
| float | Float | Actuator | — |
| hand-actuated | Hand Actuated or Handwheel | Actuator | — |
| piston | Piston | Actuator | — |
| piston-positioner | Piston Actuator with Positioner or Position Switches | Actuator | — |
| positioner-actuator | Positioner Shown on Actuator | Actuator | — |
| rotary-motor | Rotary Motor (may be Electric Hydraulic or Pneumatic) | Actuator | — |
| solenoid | Solenoid | Actuator | — |
| spring-relief | Spring - For Pressure Relief or Safety Valve Only | Actuator | — |
| weight | Weight | Actuator | — |
| stop-plate | Stop Plate | Piping Valve | — |
| stoplog | Stoplog | Piping Valve | — |
| cap | Cap | Fittings | — |
| blind-flange | Blind Flange | Fittings | — |
| flange-joint | Flange Joint | Fittings | — |
| flexible-coupling | Flexible Coupling | Fittings | — |
| flexible-hose | Flexible Hose | Fittings | — |
| hose-coupling | Hose Coupling | Fittings | — |
| nozzle | Nozzle | Fittings | — |
| reducer-concentric | Reducer - Concentric | Fittings | — |
| reducer-flat-bottom | Reducer - Flat Bottom | Fittings | — |
| reducer-flat-top | Reducer - Flat Top | Fittings | — |
| pump-variable-speed | Pump Driven by a Variable Speed Motor | Variable Speed Pump | — |
| Tag | Function (ISA 5.1) | Description | Details | Connects to |
|---|---|---|---|---|
| pilot-light | — | Pilot Light | General Instrument Function | — |
| pressure-setting-balloon-right | — | Pressure Setting Balloon (Right) | General Instrument Function | — |
| pressure-setting-balloon-left | — | Pressure Setting Balloon (Left) | General Instrument Function | — |
| undefined-interlock-logic | — | Undefined Interlock Logic | General Instrument Function | — |
| ultrasonic-level-sensor | LE = Level Element | Utrasonic | Level Sensor | — |
| conductivity-probe | LE = Level Element | Conductivity Probe | Level Sensor | — |
| ball-float | LE = Level Element | Ball Float | Level Sensor | — |
| orifice-type | — | Flow Element, Orifice Type | Primary Element Flow Rate | — |
| flume | — | Flume | Primary Element Flow Rate | — |
| flow-element-code-balloon | FE = Flow Element | Flow Element Code Balloon (To be associated with Element) | Primary Element Flow Rate | — |
| magnetic-flowmeter | — | Magnetic Flowmeter | Primary Element Flow Rate | — |
| pitot-tube-annubar | — | Pitot Tube or Annubar | Primary Element Flow Rate | — |
| positive-displacement-flowmeter | — | Positive Displacement Flowmeter | Primary Element Flow Rate | — |
| thermal-mass-flowmeter | — | Thermal Mass Flowmeter | Primary Element Flow Rate | — |
| turbine-flowmeter | — | Turbine Flowmeter | Primary Element Flow Rate | — |
| ultrasonic-flowmeter | — | Ultrasonic Flowmeter | Primary Element Flow Rate | — |
| variable-area-flow-indicator | — | Variable Area Flow Indicator | Primary Element Flow Rate | — |
| vortex-meter | — | Vortex Meter | Primary Element Flow Rate | — |
| weir | — | Weir | Primary Element Flow Rate | — |
| Tag | Description | Details | Connects to |
|---|---|---|---|
| psv | Globe, Diaphragm Type Pressure Sustaining Valve | Self actuated regulating valve | — |
| pcv | Globe, Diaphragm Type Pressure Regulating Valve | Self actuated regulating valve | — |
| prv | Globe, Diaphragm Type Pressure Relief Valve | Self actuated regulating valve | — |
| psv-spring | Spring Actuated Pressure Relief Valve | Self actuated regulating valve | — |
| psv-spring-90 | Spring Actuated 90° Pressure Relief Valve | Self actuated regulating valve | — |
| hocv | HOCV | Self actuated regulating valve, with pressure set points in kPa | — |
| hosv | HOSV | Self actuated regulating valve, with pressure set points in kPa | — |
| valve-angle | Valve, Angle | Piping Valve | — |
| valve-ball | Valve, Ball | Piping Valve | — |
| valve-butterfly | Valve, Butterfly | Piping Valve | — |
| valve-diaphragm | Valve, Diaphragm | Piping Valve | — |
| valve-fire-plug | Valve, Fire Plug | Piping Valve | — |
| valve-gas-release | Valve, Gas Release | Piping Valve | — |
| valve-gate | Valve, Gate | Piping Valve | — |
| valve-general | Valve, General | Piping Valve | — |
| valve-globe | Valve, Globe | Piping Valve | — |
| hydrant | Hydrant | Piping Valve | — |
| valve-knife-gate | Valve, Knife Gate | Piping Valve | — |
| valve-needle | Valve, Needle | Piping Valve | — |
| valve-non-return | Valve, Non Return | Piping Valve | — |
| valve-backflow | Valve, Backflow Prevention Device | Piping Valve | — |
| penstock | Penstock | Piping Valve | — |
| valve-pinch | Valve, Pinch | Piping Valve | — |
| valve-plug | Valve, Plug | Piping Valve | — |
| valve-3-way | Valve, 3 Way | Piping Valve | — |
| Tag | Description | Details | Connects to |
|---|---|---|---|
| main-process-lines | Main Process Lines | Thick solid line | — |
| secondary-process-line | Secondary Process Line | Thin solid line | — |
| covered-channel | Covered Channel | Thick dashed line | — |
| open-channel | Open Channel | Two parallel thin solid lines | — |
| instrument-supply | Instrument Supply or Connection to Process | Thin solid line | — |
| undefined-signal | Undefined Signal | Thin solid line with cross hatch | — |
| pneumatic-signal | Pneumatic Signal | Thin solid line with double cross hatch | — |
| electrical-signal | Electrical Signal | Thin dashed line | — |
| electrical-signal-digital | Electrical Signal (Digital) | Thin dashed line with cross hatch | — |
| software-link | Software Link | Thin solid line with open circles | — |
| Tag | Description | Details | Connects to |
|---|---|---|---|
| termination-point | Termination Point | Diamond symbol with solid fill | — |
| in-left-out-right | In Left/Out Right | Arrowhead with text | — |
| out-left-in-right | Out Left/In Right | Arrowhead with text | — |
| liquid-flow-arrow | Liquid Flow Arrow | Solid triangle pointing right | — |
| connection-lines | Connection (Of Lines) | Solid circle at line intersection | — |
| positioner-tag | Positioner Tag | Actuator | — |
| haz-level-b | Haz Level B | (AVERAGE) eg. CHLORINE, CAUSTIC | — |
| haz-level-c | Haz Level C | (LOW) eg. POLYMER, HIGH PRESSURE | — |
| haz-level-e | Haz Level E | (NEGLIGIBLE) eg. WATER | — |