| Code | Description |
| 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 |