| 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 |