ABAC Tech ATH 15 bar: two-stage machines for continuous duty
ABAC Tech ATH · 15 bar · two-stageAn ordinary single-stage piston compressor stops somewhere around ten, at most eleven bar. ABAC Tech ATH reaches 15 bar because it compresses in two stages: the first, larger cylinder pre-compresses the air, an intercooler takes the heat out of it and the second, smaller cylinder pushes it up to working pressure. Add an S1 motor at a 100% duty cycle, direct drive without belts and a slow 1,500 rpm. Eight machines from 1.5 to 7.5 kW: five on a base frame for your own installation and three ready-mounted on a horizontal receiver.
Three things that decide the choice
All eight machines are oil lubricated, two-stage for 15 bar, direct driven and run on a three-phase 400 V supply. They differ in three things.
1. How much air at fifteen bar?
What matters is the delivery at 15 bar, not the intake — that is the air which actually reaches your process. The range is 180 to 702 l/min. Because the motor may run continuously, work with the average consumption per shift, not with the peak.
2. On a frame, or straight on a receiver?
Five machines come on a base frame without a vessel — for plants that already have pipework or their own 15 bar pressure vessel. Three arrive mounted on a horizontal receiver (90 or 270 l) as a complete assembly that only has to be placed and connected.
3. Will your supply take a direct start?
Five machines carry an X in the code — the motor starts through a star-delta sequence, so the inrush current is gentler. From 4 kW up it is a necessity rather than an extra. The machines up to 2.2 kW start directly.
How to read the machine code
The code ATH-5.5/15-270FTX has four parts: ATH is the high-pressure range, the first number is the motor input in kilowatts, /15 is the working pressure in bar and the letters at the end define the version.
BT — on a base frame
Five machines, 71 to 121 kg. Airend and motor on a steel frame, no vessel. The air goes straight into the pipework or into your own pressure vessel — which has to be certified for 15 bar.
FT — on a horizontal receiver
Three machines, 97 to 223 kg. A complete assembly: airend, motor and pressure switch mounted on the vessel, which doubles as the base. Volume 90 or 270 litres.
X — star-delta
Five machines from 4 kW up. The motor starts in two steps, so the current peak at start-up is markedly lower. Once running, it makes no difference.
Why two stages and not one
Compressing air to fifteen bar in a single step is only possible at the cost of high temperature and poor efficiency — which is why ordinary single-stage machines stop around ten bar. ATH therefore uses two cylinders connected in series: the larger low-pressure one draws the air in and pre-compresses it, the intercooler takes the heat out and the smaller high-pressure cylinder pushes it to 15 bar. Cooling between the stages is exactly what makes a two-stage design efficient.
The figures show it: the 1.5 kW airend draws in 252 l/min and still delivers 180 l/min at a full fifteen bar. A single-stage machine of the same size loses almost two thirds of its intake volume at ten bar. The rest of the build is the same as in the other ABAC Tech ranges: an oil-lubricated airend with V-arranged cylinders, stainless steel valves, bearings greased for their whole service life, a large fan and a four-pole S1 motor for continuous load.
All eight machines side by side
ABAC Tech ATH 15 bar compressors — 8 machines, two-stage, S1 100 %, 1.5 to 7.5 kW, 180 to 702 l/min delivered | ||||||||
|---|---|---|---|---|---|---|---|---|
| Model | Receiver | Starting | Input | Intake | Delivery at 15 bar | Lwa / Lwp | Weight | Dimensions |
| ATH-1,5/15-BT | no vessel | direct | 1.5 kW | 252 l/min | 180 l/min | 98 / 78 dB(A) | 71 kg | 686 × 575 × 671 mm |
| ATH-2,2/15-BT | no vessel | direct | 2.2 kW | 318 l/min | 234 l/min | 99 / 79 dB(A) | 73 kg | 686 × 575 × 671 mm |
| ATH-2,2/15-90FT | 90 l | direct | 2.2 kW | 318 l/min | 234 l/min | 99 / 79 dB(A) | 97 kg | 1,000 × 533 × 980 mm |
| ATH-4/15-BTX | no vessel | star-delta | 4 kW | 570 l/min | 402 l/min | 99 / 79 dB(A) | 80 kg | 686 × 575 × 671 mm |
| ATH-5,5/15-BTX | no vessel | star-delta | 5.5 kW | 780 l/min | 552 l/min | 100 / 80 dB(A) | 101 kg | 1,073 × 693 × 761 mm |
| ATH-5,5/15-270FTX | 270 l | star-delta | 5.5 kW | 780 l/min | 552 l/min | 100 / 80 dB(A) | 211 kg | 1,915 × 606 × 1,162 mm |
| ATH-7,5/15-BTX | no vessel | star-delta | 7.5 kW | 1,002 l/min | 702 l/min | 101 / 81 dB(A) | 121 kg | 1,073 × 693 × 761 mm |
| ATH-7,5/15-270FTX | 270 l | star-delta | 7.5 kW | 1,002 l/min | 702 l/min | 100 / 80 dB(A) | 223 kg | 1,915 × 606 × 1,162 mm |
Delivery is the amount of air the machine actually supplies at a working pressure of 15 bar; intake is the volume drawn in by the low-pressure cylinder. Lwa is the sound power level from the rating plate, Lwp the sound pressure level at a distance of four metres. Dimensions are length × width × height. All values are manufacturer data.
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Noise without window dressing
These machines are loud and there is no point hiding it: the sound power level Lwa is 98 to 101 dB. It is an open industrial machine with no enclosure at all, designed for output and heat removal, not for quiet in the room. It belongs in a plant room, an annex or behind a wall, not next to a workbench.
🔴 Be careful when comparing offers. Catalogues often quote 78 to 81 dB for the same machine — but that is the sound pressure Lwp measured at four metres, roughly 20 dB(A) below the sound power Lwa on the rating plate. Both figures are correct, each simply measures something different. We list both for every machine.
The versions up close
The same two-stage airend arrives either on a base frame or mounted on a horizontal receiver.
What all the machines share
Two-stage compression to 15 bar
The low-pressure cylinder pre-compresses, the intercooler removes the heat and the high-pressure cylinder pushes the air up to working pressure.
S1 motor at 100 % duty
A four-pole motor rated for continuous load. It needs no cooling breaks.
Direct drive without belts
The airend sits directly on the motor. No belt tensioning and no belt replacement.
V-arranged finned cylinders
Heavy finning carries away the heat, of which fifteen bar produces more than an ordinary machine.
Stainless steel valves
A stainless valve plate takes high temperatures and the cyclic load of continuous duty.
Bearings greased for life
The crankshaft bearings are not greased at service intervals — they are filled at the factory.
Three-phase 400 V supply
The whole range runs on 400 V / 50 Hz. From 4 kW up with star-delta starting.
Two-year warranty
A two-year warranty applies to every machine in the range.
Ventilek recommends
Fifteen bar means fifteen bar in the whole system. The compressor is only the beginning. The pipework, fittings, hoses and above all the pressure vessel have to be rated for 15 bar — a ten-bar vessel simply cannot be connected here. If you do not have a fifteen-bar vessel, go straight for the FT version on a receiver, where a certified vessel is part of the package. And if you need fifteen bar only occasionally and the machine does not have to run non-stop, look at the belt-driven B range for 15 bar — that is a workshop machine, not an industrial airend for continuous duty.
Frequently asked questions
- Why do I need a two-stage machine if I want 15 bar?
- Because single-stage compression to fifteen bar means a high outlet temperature and a large loss of efficiency. Two stages share the work and the air is cooled between them — so at fifteen bar the machine delivers more air and is under less thermal stress. With ATH the figures show it: 252 l/min of air drawn in against 180 l/min delivered at full pressure.
- What exactly does S1 mean and why does it matter?
- S1 is the standard designation of a motor duty type: the machine may run continuously at full output as long as it is cooled. Ordinary workshop compressors have S3, which means that after a certain running time a cooling break has to follow — usually roughly half and half. Leave an S3 machine running non-stop and it will overheat, cutting its life to a fraction.
- What is the difference between the BT and FT versions?
- The machine inside is the same. BT is the airend with motor on a steel base frame without a vessel — the air goes into the pipework or into your own pressure vessel. FT is the same unit mounted on a horizontal receiver (90 or 270 l) that doubles as the base. FT only has to be placed and connected; BT assumes you already have the air reserve.
- Does the whole system have to be certified for 15 bar?
- Yes. The pressure vessel, pipework, hoses and fittings have to be rated for the working pressure and the vessel must have a valid inspection. A 10 bar vessel cannot be connected to a fifteen-bar machine. If you are not sure what your existing set-up will take, the FT version with the manufacturer’s vessel is the safer choice.
- Why does the table show delivery instead of intake?
- Because delivery is the air that actually reaches your process at a working pressure of 15 bar. Intake is the volume drawn in by the low-pressure cylinder — on the ATH-1.5/15 that is 252 l/min against 180 l/min delivered. Delivery decides the choice of machine; we list both so it is clear which is which.
- Is it really that loud?
- Yes. The sound power Lwa is 98 to 101 dB, which is what an open industrial machine without an enclosure sounds like. The figure of 78 to 81 dB that appears for these machines is the sound pressure at four metres — a different quantity, roughly 20 dB(A) lower. If you need a machine for a room where people work, look for a version in a sound-insulated enclosure.
- Can the machine run on 230 V?
- No. Every machine in this category runs on a three-phase 400 V / 50 Hz supply. The five strongest ones also start through a star-delta sequence, so matching protection is required.
Where to go next
This category is the fifteen-bar branch of the ABAC Tech ATH range. The other branches of the industrial range look like this: You will find an overview of every range in the Compressors category.
- ATH at 20 bar — the same two-stage design at a higher working pressure
- ATH at 30 bar — the highest pressure of the range — for pressure testing and special processes
- The ten-bar ATL range — when fifteen bar is not needed — single-stage S1 machines for 10 bar
- Belt-driven B range for 15 bar — the workshop alternative with V-belts and a receiver, not rated for continuous duty
- ATL on a receiver — complete assemblies for 10 bar — 90 and 270 litres
- How to choose a compressor — from the consumption of your tools through output to the size of the receiver
Performance data are measured to ISO 1217, Annex C, latest edition; noise to ISO 2151. Under the European machinery directive the sound power level Lwa is stated on the machine rating plate, while the sound pressure level Lwp is measured at a distance of four metres and is roughly 20 dB(A) lower. All values are manufacturer data.
Bestsellers
Product sorting
List of products
The smallest machine of the range on a steel base frame. Fifteen bar in two stages, without a vessel — the air goes straight into the pipework or into a receiver you already own.
A complete assembly: a two-stage airend mounted on a horizontal ninety-litre vessel. The machine arrives assembled — it only has to be placed and connected.
Two point two kilowatts on a base frame. The strongest machine of the range that still starts directly, without a star-delta sequence.
Four kilowatts on a base frame with star-delta starting. A two-stage airend that delivers over four hundred litres a minute at a full fifteen bar.
A complete assembly on a horizontal two-hundred-and-seventy-litre vessel. A 5.5 kW two-stage airend with star-delta starting, ready to be placed and connected.
Five and a half kilowatts on a base frame, with star-delta starting. For plants that have their own certified fifteen-bar vessel.
The largest complete assembly of the range: seven and a half kilowatts on a horizontal two-hundred-and-seventy-litre vessel, with star-delta starting.
The strongest machine of the range on a base frame. Seven and a half kilowatts, two-stage compression and over seven hundred litres a minute at fifteen bar.