160 – 250 kW screw compressors

The airend is two-stage and runs on four gears rather than three. That lets each rotor turn at the right speed for the pressure being asked of it, instead of one compromise speed chosen for the middle of the range. It is where the efficiency across 7.5 to 13 bar comes from, and it is why the drop in delivery as you raise pressure is smaller than on a single-stage machine.

The oil filter, the check valve, the temperature valve and the oil distribution are built into the airend package rather than plumbed around it. Fewer joints means fewer places to weep, and a service that would otherwise mean breaking four connections means breaking one.

Two-stage compression normally costs floor space, which is the reason plants that would benefit from it carry on with single-stage. This range delivers it in the footprint of a single-stage unit, which is worth knowing if your plant room was sized fifteen years ago and has not grown since.

A touch screen that speaks the language of whoever is standing in front of it, with the machine's state on the home page: pressure, load, running hours and how long until the next service.

Trend graphs are the part operators actually use. A discharge temperature that has been climbing for three weeks is visible on a graph long before it trips the machine on a Thursday afternoon.

A real-time clock starts and stops the compressor to your shift pattern rather than leaving it loaded through the night. A second pressure setting covers the hours when the plant does not need full pressure. The cheapest saving available on any compressed air system.

Fault history is kept on the machine, so the engineer who arrives reads what happened rather than what someone remembers. Remote start and stop run through programmable inputs, the machine restarts itself after a power cut, and run data is logged to an SD card. Remote monitoring is fitted as standard.

A service kit holds every wear part for that interval in one box. Filters, separator, seals and O-rings are all in there, so nothing turns up missing halfway through the job and the machine goes back together the same day.

Filters that look identical can flow differently. One that restricts the inlet by two tenths of a bar costs more in electricity over a year than the entire service did. This is the single most common way a compressed air bill goes up without anyone noticing.

Kits are made up by interval. There is one for the 4,000 hour service, one for the separator change and one for the major overhaul. We quote them against your machine's serial number rather than guessing from the model, because air-cooled and water-cooled builds take different parts.

Compressor fluid is supplied to the specification the machine was tested on. Mixing fluids is the commonest cause of separator failure we are called out to, and it is entirely avoidable.