| Code | Description |
| TT | Temperature transmitter |
| VA-LI | Actuated valve, liquid |
| XT | Transmitter |
| VA-GA | Actuated valve, gas |
| VA-EL-LI | Actuated valve, electrical-operated, liquid |
| VA-EL-GA | Actuated valve, electrical-operated, gas |
| VA-ESD-LI | Actuated valve, emergency service, liquid |
| VA-ESD-GA | Actuated valve, emergency service, gas |
| VE-LI | Pressure vessel, liquid |
| VE-LI-HP | Pressure vessel, liquid, High Pressure |
| VE-LI-LP | Pressure vessel, liquid, Low Pressure |
| VE-GA | Pressure vessel, gas |
| VE-GA-HP | Pressure vessel, gas, High Pressure |
| VE-GA-LP | Pressure vessel, gas, Low Pressure |
| COL-LT | Column/Contactor, Low Temperature |
| COL-HT | Column/Contactor, High Temperature |
| TA | Tank |
| HE-LI | Heat Exchanger, liquid/liquid-gas |
| HE-LI-LP | Heat Exchanger, liquid/liquid-gas, Low Pressure |
| HE-LI-HP | Heat Exchanger, liquid/liquid-gas, High Pressure |
| HE-GA | Heat Exchanger, gas/gas |
| HE-GA-LP | Heat Exchanger, gas/gas, Low Pressure |
| HE-GA-HP | Heat Exchanger, gas/gas, High Pressure |
| HC-LI | Air cooler, liquid |
| HC-LI-LP | Air cooler, liquid, Low Pressure |
| HC-LI-HP | Air cooler, liquid, High Pressure |
| HC-GA | Air cooler, gas |
| HC-GA-LP | Air cooler, gas, Low Pressure |
| HC-GA-HP | Air cooler, gas, High Pressure |
| BOIL | Boiler |
| BOIL-LP | Boiler , Low Pressure |
| BOIL-HP | Boiler , High Pressure |
| HM-INT | Electrical Heater, internal component |
| REA | Reactor, high temperature |
| FUR | Furnace/thermal reactor |
| CHI | Chiller (air/water) |
| PU | Pump |
| KG | Integral Gear Compressors |
| KZ | Miscellaneous compressors/blowers/ventilators |
| KA | Centrifugal compressors |
| KB | Reciprocating compressors (diaphragm) |
| KC | Screw/rotary compressors |
| KL | Axial compressors |
| HP | Cooling tower (induced draft) |
| KD | Blowers |
| KE | Fans |
| KP | Reciprocating compressor (piston) |
| PN | canned motor pump |
| PA | Centrifugal (horizontal or vertical in line) |
| PB | Reciprocating |
| GV | Circulating pump |
| PG | diaphragm pump |
| PV | Vacuum pump |
| PD | Metering pump |
| PC | Rotary/gear/screw/sliding vane |
| PH | Submersible pump with external driver |
| PS | Submersible pump with submersible motor |
| MS | Steam turbine |
| MT | Gas turbine |
| MD | Diesel engine |
| MG | Gas engine (internal combustion) |
| FA | Direct fired heater |
| FE | Cabin furnace |
| FF | Special furnace |
| FG | Water-tube boiler, fire-tube boiler, drum boiler |
| FJ | Incinerator (including thermo disposal equipment and evaporating candles) |
| FL | Economizer |
| FX | Burner |
| FY | Indirect fired heater |
| GD | Water Boiler/Heater |
| HD | Quench boiler/cooler |
| HE | Recovery boiler |
| HS | Water cooler |
| HT | Super heater |
| HW | Waste heat recovery unit |
| HM | Electric exchanger (not sanitary) |
| HN | Electric heating system applied to equipment |
| FR | Glycol regenerator |
| VA | Horizontal/Vertical pressure vessel (general) |
| VB | Expansion tank, Pressurizer, Compensation tank, Expansion vessel, Damper |
| VC | Extractor, Scrubber, Evaporator (Vessels, columns and reactors) |
| VD | Gas boot |
| VE | Column |
| VH | Deaerator/degasser/flash tank |
| VJ | Contact absorption equipment/Regenerator |
| VK | Dryer |
| VN | Knock out drum, gun barrel and scrubber |
| VQ | Slug catcher |
| VS | Production separator |
| VY | Horizontal and vertical vessel at atmosphere pressure |
| VO | Extractor, scrubber, evaporator |
| CF | Mechanical separator/screen/vibrating screen |
| VP | Test separator |
| VU | Desalted, electrostatic separator |
| HA | Exchanger Shell and Tube |
| HB | Plate exchanger Shell |
| HC | Air cooled exchanger |
| HF | Double pipe exchanger |
| HH | Printed circuit heat exchanger |
| HK | Finned or not finned tube exchanger without shell |
| HQ | Cooling tower (natural draft) |
| HX | Spiral heat exchanger |
| HY | Cryogenic heat exchanger |
| HZ | Miscellaneous heat transfer equipment |
| EG | Electric generators (AC or DC) |
| MW | Aero Generator |
| FS | FLOW SWITCH |
| FSH | FLOW SWITCH HIGH |
| FSHH | FLOW SWITCH HIGH HIGH |
| FSHL | FLOW RATE SWITCH HIGH LOW |
| FSL | FLOW RATE SWITCH LOW |
| FT | FLOW TRANSMITTER |
| LDT | LEVEL DIFFERENTIAL TRANSMITTER |
| LG | LEVEL GLASS GAUGE |
| LSH | LEVEL SWITCH HIGH |
| LSHH | LEVEL SWITCH HIGH HIGH |
| LSHL | LEVEL SWITCH HIGH LOW |
| LSL | LEVEL SWITCH LOW |
| LSLL | LEVEL SWITCH LOW LOW |
| LT | LEVEL TRANSMITTER |
| PDT | PRESSURE DIFFERENTIAL TRANSMITTER |
| PSH | PRESSURE SWITCH HIGH |
| PSHH | PRESSURE SWITCH HIGH HIGH |
| PSHL | PRESSURE SWITCH HIGH LOW |
| PSL | PRESSURE SWITCH LOW |
| PSLL | PRESSURE SWITCH LOW LOW |
| PT | PRESSURE TRANSMITTER |
| TDT | TEMPERATURE DIFFERENTIAL TRANSMITTER |
| TS | TEMPERATURE SWITCH |
| TSH | TEMPERATURE SWITCH HIGH |
| TSHH | TEMPERATURE SWITCH HIGH HIGH |
| TSHL | TEMPERATURE SWITCH HIGH LOW |
| TSL | TEMPERATURE SWITCH LOW |
| TSLL | TEMPERATURE SWITCH LOW LOW |
| AT | ANALYSIS TRANSMITTER |
| EC | Control boards (e.g. EMS, LLS, etc.) |
| EJ | Interconnecting panels, Junction boxes |
| EL | Auxiliary Service Panel (ASP), Lighting, Small Power, tracing distribution boards |
| ER | Electrical Power Unit (EPU) |
| ES | Motor Driver panel (e.g. VFD, VSD, Soft-Starter, etc.) |
| JI | Master Control Station (MCS) |
| JP | Pneumatic and/or hydraulic Control panel, any Local Control Panel |
| JQ | I/O Remote cabinet |
| JT | Junction box |
| JW | Well head Control Panel |
| FCM | Flow Control Module |
| JE | Safety integrated System (SIS), Emergency shutdown (ESD)equipment |
| JG | Power Distribution Panel for control or safety equipment |
| JH | High Integrity Protection Pressure System (HIPPS) |
| JL | Safety (ESD /F&G) Unit Control Panel (UCP-S), Package Safety System (PLC based, or Relays based) |
| JU | Extinguishing gas panel, Deluge panel, Firefighting panel |
| JX | Flare ignition panel |
| JK | Process or Generic Unit Control Panel (UCP-C), Package Control System (PLC based, or Relays based) |
| JD | Process Control System (PCS)/ Distributed Control System equipment (DCS) |
| R* | Manual Valve |
| RB | Ball valve |
| UV | ON/OFF (NOT SAFETY) VALVE |
| RF | Butterfly valve |
| RC | Check valve |
| RD | Diaphragm valve |
| RG | Gate valve |
| MOV | MOTOR OPERATED VALVE |
| RA | Globe valve |
| FCV | FLOW RATE CONTROL VALVE |
| FV | FLOW VALVE |
| LCV | LEVEL CONTROL VALVE |
| LDCV | LEVEL DIFFERENTIAL CONTROL VALVE |
| LV | LEVEL VALVE |
| PCV | PRESSURE CONTROL VALVE |
| PDCV | PRESSURE DIFFERENTIAL CONTROL VALVE |
| TCV | TEMPERATURE CONTROL VALVE |
| TDCV | TEMPERATURE DIFFERENTIAL CONTROL VALVE |
| TV | TEMPERATURE VALVE |
| PSV | PRESSURE SAFETY VALVE |
| PVSV | PRESSURE VACUUM SAFETY VALVE |
| US | HIPPS |
| UT | SSIV Module |
| SSSV | SUBSURFACE SAFETY VALVE |
| BDV | BLOW DOWN VALVE |
| ESDV | EMERGENCY SHUTDOWN VALVE |
| PSDV | PRODUCTION SHUTDOWN VALVE |
| SDV | SHUT DOWN VALVE |
| SSV | SURFACE SAFETY VALVE |
| SCSSV | Surface Controlled Subsurface Safety Valve |
| SSCV | SUBSURFACE CONTROL VALVE |
| SSIV | SUBSEA ISOLATION VALVE |
| HFL | Hydraulic/Chemical flying lead |
| EFL | Electrical flying lead |
| EHFL | Electro-Hydraulic Flying Lead |
| EOFL | Electro-Optic Flying Lead |
| OFL | Optic Flying Lead |
| MPFL | Multi-Purpose Flying Lead |
| UJ | Dynamic Umbilical |
| UK | Static Umbilical |
| UL | Integrated Pipeline Umbilical |
| EB | Accumulator Batteries |
| JF | Safety integrated System (SIS), Fire and Gas detection equipment, Fire Adressable Control Panel (FACP) |
| BE | FLAME DETECTOR |
| CN | Active carbon filter |
| CK | Basket Strainer |
| CM | Sand filter/"Dual media" filter |
| CA | Regenerative filter |
| CL | Cartridge filter |
| CY | Miscellaneous filters |
| GC | Specific filters for H.V.A.C. |
| GY | Chemical filter scrub |
| CQ | Coalescence filter and separator |
| CE | Static mixer |
| CJ | Mixer/Agitator (motorized) |
| GL | UV type sterilizer (for water), Water softener and Demineraliser |
| ET | Transformers and autotransformers |
| EM | MCC switchgears |
| EH | Medium Voltage switchgears |
| TB | Atmospheric storage tank, cylindrical (floating roof) |
| TC | Atmospheric storage tank, not cylindrical |
| TD | Spherical or spheroid tank |
| TE | Bin bulk storage |
| TG | Silos |
| TH | Drainage separator basin |
| TJ | Diaphragm Tank |
| TF | Cylinder storage tank (above and underground |
| ML | Turbo-expander |
| ED | DC UPS (Direct Current Panels - DCP) |
| EK | AC UPS |
| UE | Oil Production Xmas Tree |
| UF | Gas Production Xmas Tree |
| UG | Water Injection Xmas Tree |
| UH | Gas Injection Xmas Tree |
| UI | WAG Injection Xmas Tree |
| SCK | Subsea Choke Module |
| CITV | Chemical Injection Throttle Valve |
| DCITV | Dual Chemical Injection Throttle Valve |
| PMV | Production Master Valve |
| PWV | Production Wing Valve |
| UPMV | Upper Production Master Valve |
| AVV | Annulus vent valve |
| XOV | Crossover Valve |
| SCM | Subsea Control module |
| UM | Subsea Distribution Unit |
| UO | Gas Production Manifold / PLEM |
| UN | Oil Production Manifold / PLEM |
| UP | Water Injection Manifold / PLEM |
| UQ | Gas Injection Manifold / PLEM |
| UR | WAG Injection Manifold / PLEM |
| DW | Well-head and Christmas tree manifold |
| UY | Subsea Pump Module |
| ESP | Electrical Submersible Pump |
| UU | Multiphase Pump |