Where diesel mobile wins
Sites without a power supply, work that moves, and duties that need air before the electrical installation is finished. A diesel driven compressor is self-contained: fuel in, air out, no supply to arrange. The trade-off is that running cost per cubic metre is higher than a fixed electric machine, so mobile units are usually specified for their mobility, not their efficiency.
The pressure question
Mobile units in our catalogue cover the 14 to 25 bar band - 14, 17, 18, 21 and 25 bar variants. That is deliberately wider than the workshop band because the applications differ: general site air sits around 7 to 10 bar, while drilling, pipeline testing and some demolition tools need considerably more. Buying at the higher pressure when the work needs 8 bar costs fuel on every hour of operation.
| Question | Why it decides the machine |
|---|---|
| Required pressure at the tool | Do not buy 25 bar to run 8 bar tools |
| Free air delivery | Two tools at once need the sum of their consumption plus margin |
| Duty cycle | Continuous duty needs a larger cooling package and a bigger fuel tank |
| Altitude and ambient | Both reduce delivered performance; state them when enquiring |
| Mobility | Skid, wheeled chassis or towable - dictated by how often it moves |
Running it well
- Fuel and filters - diesel quality and filter changes matter more than on an electric machine.
- Air intake - dusty sites clog elements quickly; check daily, not weekly.
- Aftercooling - mobile packages often have limited cooling; the dryer downstream has to be sized for the real inlet temperature.
- Storage - a receiver on the chassis plus one at the tool gives steadier pressure than either alone.
Browse the range on the diesel mobile compressor collection page.
Tell us the working pressure, flow and site conditions and we will propose a configuration. Contact OPPAIR.