This document is a legend drawing that defines standard symbology for process and instrumentation diagrams used by SA Water. It provides descriptions for line types, valves, fittings, sensors, flow elements, and hazardous classification levels.
Source: TS-112-Process-and-Instrument-Diagrams.pdf · page 16/27 · Drawing: 4003-00001-01 rev 1 · Components: 87 (1 equipment, 15 instrument, 25 valve, 10 line, 36 other)
| Tag | Description | Details | Connects to |
|---|---|---|---|
| pump-var-speed | PUMP DRIVEN BY A VARIABLE SPEED MOTOR | SIC in circle, M in circle, Pump symbol | — |
| Tag | Function (ISA 5.1) | Description | Details | Connects to |
|---|---|---|---|---|
| lvl-ultrasonic | LE = Level Element | ULTRASONIC | Circle with tag | — |
| lvl-cond-probe | LE = Level Element | CONDUCTIVITY PROBE | Circle with tag | — |
| lvl-ball-float | LE = Level Element | BALL FLOAT | Circle with tag | — |
| flow-orifice | — | FLOW ELEMENT, ORIFICE TYPE | Lines on pipe | — |
| flow-flume | — | FLUME | Venturi-like shape | — |
| flow-element-balloon | FE = Flow Element | FLOW ELEMENT CODE BALLOON | Circle tag on line | — |
| flow-mag | — | MAGNETIC FLOWMETER | Box with 'M' | — |
| flow-pitot | — | PITOT TUBE or ANNUBAR | Box with J-tube | — |
| flow-pos-disp | — | POSITIVE DISPLACEMENT FLOWMETER | Box with figure-8 | — |
| flow-therm-mass | — | THERMAL MASS FLOWMETER | Box with 'T' | — |
| flow-turbine | — | TURBINE FLOWMETER | Box with 'X' | — |
| flow-ultrasonic | — | ULTRASONIC FLOWMETER | Box with 'U' wave | — |
| flow-var-area | — | VARIABLE AREA FLOW INDICATOR | Circle overlapping triangle | — |
| flow-vortex | — | VORTEX METER | Box with triangle | — |
| flow-weir | — | WEIR | V-notch symbol | — |
| Tag | Description | Details | Connects to |
|---|---|---|---|
| val-globe-diaph-sus | GLOBE, DIAPHRAGM TYPE PRESSURE SUSTAINING VALVE | PSV tag in circle | — |
| val-globe-diaph-reg | GLOBE, DIAPHRAGM TYPE PRESSURE REGULATING VALVE | PCV tag in circle | — |
| val-globe-diaph-relief | GLOBE, DIAPHRAGM TYPE PRESSURE RELIEF VALVE | PRV tag in circle | — |
| val-spring-act-relief | SPRING ACTUATEDPRESSURE RELIEF VALVE | PSV tag in circle | — |
| val-spring-act-90-relief | SPRING ACTUATED 90 DEG PRESSURE RELIEF VALVE | PSV tag in circle | — |
| val-hocv | HOCV | Pressure setting ...kPa | — |
| val-hosv | HOSV | Pressure setting ...kPa | — |
| val-angle | VALVE, ANGLE | Two triangles | — |
| val-ball | VALVE, BALL | Bowtie with circle | — |
| val-butterfly | VALVE, BUTTERFLY | Bowtie with angled dash | — |
| val-diaph | VALVE, DIAPHRAGM | Bowtie with mushroom | — |
| val-fire-plug | VALVE, FIRE PLUG | Simple bowtie | — |
| val-gas-release | VALVE, GAS RELEASE | Symbol with loop | — |
| val-gate | VALVE, GATE | Simple bowtie | — |
| val-general | VALVE, GENERAL | Simple bowtie | — |
| val-globe | VALVE, GLOBE | Bowtie with dot | — |
| hydrant | HYDRANT | Square with 'H' | — |
| val-knife-gate | VALVE, KNIFE GATE | Bowtie with vertical line | — |
| val-needle | VALVE, NEEDLE | Bowtie with angled arrow | — |
| val-non-return | VALVE, NON RETURN | N shape in bowtie | — |
| val-backflow-prev | VALVE, BACKFLOW PREVENTION DEVICE | Double Z shape in bowtie | — |
| penstock | PENSTOCK | Vertical rectangle | — |
| val-pinch | VALVE, PINCH | Crosses in bowtie | — |
| val-plug | VALVE, PLUG | Diamond in bowtie | — |
| val-3-way | VALVE, 3 WAY | Three triangles meeting | — |
| Tag | Description | Details | Connects to |
|---|---|---|---|
| line-main | MAIN PROCESS LINES | Thick solid line | — |
| line-secondary | SECONDARY PROCESS LINE | Thin solid line | — |
| line-covered | COVERED CHANNEL | Dashed thick line | — |
| line-open | OPEN CHANNEL | Parallel thin lines | — |
| line-instrument | INSTRUMENT SUPPLY OR CONNECTION TO PROCESS | Solid line with short perpendicular dashes | — |
| line-undefined | UNDEFINED SIGNAL | Line with cross dashes | — |
| line-pneumatic | PNEUMATIC SIGNAL | Line with double cross dashes | — |
| line-electrical | ELECTRICAL SIGNAL | Dashed line | — |
| line-electrical-digital | ELECTRICAL SIGNAL (DIGITAL) | Line with 'o' symbols | — |
| line-software | SOFTWARE LINK | Line with open circles | — |
| Tag | Description | Details | Connects to |
|---|---|---|---|
| term-point | TERMINATION POINT | Arrowhead on line segment, existing vs new | — |
| in-left-out-right | IN LEFT/OUT RIGHT | Arrow box with label placeholders | — |
| out-left-in-right | OUT LEFT/IN RIGHT | Arrow box with label placeholders | — |
| flow-arrow | LIQUID FLOW ARROW | Solid arrowhead on line | — |
| conn-lines | CONNECTION (OF LINES) | Intersecting lines with dot | — |
| act-diaph | DIAPHRAGM | Mushroom shape | — |
| act-diaph-bal | DIAPHRAGM, PRESSURE BALANCED | Mushroom with line | — |
| act-float | FLOAT | Line with circle | — |
| act-hand | HAND ACTUATED OR HANDWHEEL | T shape | — |
| act-piston | PISTON | Rectangle on line | — |
| act-piston-pos | PISTON ACTUATOR WITH POSITIONER OR POSITION SWITCHES | Rectangle with small box | — |
| act-pos-shown | POSITIONER SHOWN ON ACTUATOR | Mushroom with side circle | — |
| act-pos-tag | POSITIONER TAG | Small square tag | — |
| act-rotary | ROTARY MOTOR (MAY BE ELECTRIC HYDRAULIC or PNEUMATIC) | Circle with 'M' | — |
| act-sol | SOLENOID | Square with 'S' | — |
| act-spring | SPRING - FOR PRESSURE RELIEF OR SAFETY VALVE ONLY | Zig-zag line | — |
| act-weight | WEIGHT | Rectangle with line | — |
| stop-plate | STOP PLATE | Line with crossbar | — |
| stoplog | STOPLOG | Stacked rectangles | — |
| fit-cap | CAP | Arc at line end | — |
| fit-blind-flange | BLIND FLANGE | Short vertical line on end | — |
| fit-flange-joint | FLANGE JOINT | Two short vertical lines | — |
| fit-flex-coupling | FLEXIBLE COUPLING | Curved lines joining | — |
| fit-flex-hose | FLEXIBLE HOSE | Wavy line | — |
| fit-hose-coupling | HOSE COUPLING | Rectangle connector | — |
| fit-nozzle | NOZZLE | Arrowhead | — |
| fit-red-con | REDUCER - CONCENTRIC | Trapezoid on axis | — |
| fit-red-flat-bot | REDUCER - FLAT BOTTOM | Trapezoid flat bottom | — |
| fit-red-flat-top | REDUCER - FLAT TOP | Trapezoid flat top | — |
| gen-plot-light | PLOT LIGHT | Circle with cross lines | — |
| gen-press-set-r | PRESSURE SETTING BALLOON (RIGHT) | Circle on line right | — |
| gen-press-set-l | PRESSURE SETTING BALLOON (LEFT) | Circle on line left | — |
| gen-undef-intl | UNDEFINED INTERLOCK LOGIC | Diamond symbol | — |
| haz-lvl-b | HAZ LEVEL (AVERAGE) eg. CHLORINE, CAUSTIC | Hexagon with 'B' | — |
| haz-lvl-e | HAZ LEVEL (LOW) eg. POLYMER, HIGH PRESSURE | Hexagon with 'E' | — |
| haz-lvl-f | HAZ LEVEL (NEGLIGIBLE) eg. WATER | Hexagon with 'F' | — |