| GAS COMPRESSORS | OPERATING EFFICIENCY |
| Centrifugal | 70% |
| Screw | 75% |
| Reciprocating | 80% |
| PUMPS | |
| Centrifugal | 65% |
| Reciprocating | 85% |
| Rotary | 75% |
Typical Turndown Performance
| LOAD | 100% | 75% | 50% | 40% |
| Efficiency of Gas Turbine (3MW) | 28% | 26% | 21% | 18% |
| Efficiency of Gas Recip Engine (2MW) | 38% | 36% | 32% | 30% |
| Motor (300kW) | 94% | 94% | 93% | 92% |
Guideline for Driver Performance
| Model | Type | Manufacturer | Power (HP) | Power (MW) | Efficiency (%) |
| Saturn 20 | Open Cycle Turbine | Solar | 1,590 | 1.2 | 25 |
| Centaur 40 | Open Cycle Turbine | Solar | 4,700 | 3.5 | 28 |
| Centaur 50 | Open Cycle Turbine | Solar | 6,130 | 4.6 | 29 |
| Taurus 60 | Open Cycle Turbine | Solar | 7,700 | 5.7 | 30 |
| Taurus 70 | Open Cycle Turbine | Solar | 10,915 | 8.1 | 34 |
| Mars 90 | Open Cycle Turbine | Solar | 13,220 | 9.9 | 32 |
| Mars 100 | Open Cycle Turbine | Solar | 15,900 | 11.9 | 32 |
| Titan 120 | Open Cycle Turbine | Solar | 20,500 | 15.3 | 35 |
| Titan 250 | Open Cycle Turbine | Solar | 30,000 | 22.4 | 40 |
| 501-KC5 | Open Cycle Turbine | Rolls Royce / Siemens | 5,500 | 4.1 | 30 |
| 501-KC7 | Open Cycle Turbine | Rolls Royce / Siemens | 7,200 | 5.4 | 32 |
| Avon 200 - 2648 | Open Cycle Turbine | Rolls Royce / Siemens | 21,923 | 16.3 | 31 |
| Avon 200 - 2656 | Open Cycle Turbine | Rolls Royce / Siemens | 22,807 | 17 | 32 |
| RB211 GT62 DLE | Open Cycle Turbine | Rolls Royce / Siemens | 41,084 | 30.6 | 39 |
| Trent 60 | Open Cycle Turbine | Rolls Royce / Siemens | 72,679 | 54.2 | 44 |
| Trent 60 - ISI | Open Cycle Turbine Water Injection | Rolls Royce / Siemens | 82,877 | 61.8 | 40 |
| P9390GSI | Gas Engine Rich Burn | G.E Waukesha | 1,980 | 1.5 | 33 |
| P48 GL | Gas Engine Lean Burn | G.E Waukesha | 1,065 | 0.8 | 37 |
| AT 27 GL | Gas Engine Lean Burn | G.E Waukesha | 3,130 | 2.3 | 38 |
| Small Electric Motor | Induction Motor | Various | 3 | 0.022 | 80 |
| Large Electric Motor | Induction Motor | Various | > 400 | > 0.3 | 94 |
| Large Electric Motor - VSD | Variable Speed Motor | Various | > 400 | > 0.3 | 91 |
Mathematics used to calculate gas compressor efficiency
First calculate the theoretical discharge temperature:
T2C = T1 * ((P2 / P1) ^ ((k - 1) / k))
Where:
T1 = Suction Temperature
P1 = Suction Pressure
P2 = Discharge Pressure
k = Ratio of Specific Heats
Next use theoretical discharge temperature and the actual measured discharge temperature to calculate the efficiency
isentropic efficiency = (T2C - T1) / (T2 - T1)
Where:
T2C = Calculated Discharge Temperature
T2 = Measured Discharge Temperature
T1 = Suction Temperature