| Code | Description |
| 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 |