Used High-Pressure Air Compressors for Sale
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About Used High-Pressure Air Compressors
A high-pressure compressor here is a machine for PET bottle blowing or another high-bar process, not a rotary screw that feeds shop air at about 100 psi. Ateliers François and Belliss & Morcom are the names that repeat. These are multi-stage reciprocating machines, or a booster after a lower-pressure compressor, built to reach the 30 to 40 bar a blow molder needs to form a bottle. A plant screw compressor will not do that job by turning the regulator up.
Stages, intercoolers and a final pressure are the sizing. Each stage raises pressure and dumps heat. Intercoolers and a moisture separator have to work or the next stage ingests wet air and wears. Capacity is in cubic feet per minute, or in bottles per hour once you know the blow process. A machine sized for a small reheat stretch-blow wheel will not feed a larger wheel. Discharge pressure on the nameplate has to meet the blow mold, with margin for line loss. Oil-free or oil-lubricated is a process choice. Oil in the blow air is contamination in the bottle.
Valves, rings, packings and the intercoolers are the wear. A stage that will not make its pressure is often a valve or a ring, and the hour meter on that stage matters more than the paint on the skid. Cooling water has to be at the machine. These frames reject a lot of heat. Vibration and a foundation are part of installing one. A skid that was grouted in a blow-mold hall will not sit quietly on a thin slab.
Used high-pressure compressor equipment should be run to pressure if the cooling water and the power are there. Read each stage. Look at oil or condensate where it should not be. Confirm the discharge pressure and the flow against the blow molder you have, not against a shop-air habit. Three-phase power and a starter that matches the voltage are part of the buy. A booster without the low-pressure compressor in front of it is only half a system. Inlet filters and a dryer ahead of the first stage keep the valves alive. A machine that swallowed wet, dirty air will show it in the valves before it shows it in the brochure.
How to Choose a Used High-Pressure Air Compressor
How to Size a PET Compressor
Start from the blow molder, not from a shop-air habit. Discharge pressure has to reach the bar pressure the bottles need, often near 40 bar, which is far above a plant screw. Flow has to feed the machine at that pressure, in the units the plate uses. Then see whether the dryer and the receiver are on this skid or are separate machines you still have to buy. Cooling water has to be available, because the stages throw heat. Voltage is plant three phase at a horsepower that needs a real circuit. Hours on the stages tell you how hard it has worked. An oil-free compressor that is short on pressure or short on flow will not run the bottles.
Oil-Free High Bar, Not Shop Air
A PET bottle needs air that is oil-free and at high pressure. A flooded rotary screw makes ordinary shop air and belongs on another group. The machines here, Ateliers François (AF) and Belliss and Morcom among them, are built as oil-free compressors for that bottle job. They are reciprocating stages or a booster arrangement, not a tank-mounted screw in the corner of a toolroom. Do not buy one to run impact wrenches. Do not buy a shop screw and expect it to blow preforms. Confirm the dryer and the receiver, because a bare compressor block is not always the whole air system the molder used. Ask that before you compare two skids.
High-Pressure Air Compressor Specs to Compare
| Spec | Typical range | Why it matters |
|---|---|---|
| Discharge pressure | High bar, often near 40 bar for PET | Shop pressure will not blow a bottle. The plate has to reach the process pressure. |
| Flow | Pressure without enough flow will not keep the machine in cycle. | |
| Oil-free stages | Oil in the air is a problem for a bottle. The construction is not a flooded screw. | |
| Hours | Rings, valves and packings wear with hours. The number belongs with the pressure. | |
| Dryer and receiver | A listing can be the block alone. Wet air or no buffer tank changes the install. | |
| Cooling and voltage | These skids need heat rejection and a circuit sized for the horsepower. |
Discharge pressure
Typical range: High bar, often near 40 bar for PET
Shop pressure will not blow a bottle. The plate has to reach the process pressure.
Flow
Pressure without enough flow will not keep the machine in cycle.
Oil-free stages
Oil in the air is a problem for a bottle. The construction is not a flooded screw.
Hours
Rings, valves and packings wear with hours. The number belongs with the pressure.
Dryer and receiver
A listing can be the block alone. Wet air or no buffer tank changes the install.
Cooling and voltage
These skids need heat rejection and a circuit sized for the horsepower.
What to Inspect on a Used High-Pressure Air Compressor
Read pressure and flow
Confirm the discharge pressure is high-bar bottle air, and that flow matches the molder.
Confirm it is oil-free
The stages should be the oil-free construction a PET bottle needs, not a flooded shop screw.
See what is on the skid
Note whether the dryer, receiver and cooler are included or are separate lots.
Ask for hours
Stage hours tell you about valves, rings and packings. A blank panel hides that.
Check cooling connections
The machine needs a cooling path. Missing piping is part of the install, not a surprise.
Read voltage and horsepower
Plant three phase has to exist for this motor. It is not a small shop circuit.
Inspect stage condition
Look for leaks, damaged gauges and a control panel that still shows each stage.
Meadoworks Track Record
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Makes we have handled most
Common models
Ateliers François (AF) CE46S44SG, Ateliers François (AF) CE 44 6B, Belliss & Morcom WH28H3N
Related Equipment
- Air Compressors & Air Dryers
Shop air families before the PET split
- Rotary Screw Compressors
Ordinary plant air, not bottle pressure
- Air Dryers
Dry air after a compressor, shop or process
More in Plant & Material Handling
High-Pressure Air Compressors Brands We've Sold
Common Applications
Frequently Asked Questions
Is a high-pressure compressor just a large shop compressor?
No. A high-pressure compressor on this group is oil-free air at the high bar pressure used to blow a PET bottle. A rotary screw on the shop group is flooded air at ordinary plant pressure for tools and valves. They do not substitute. Ateliers François (AF) and Belliss and Morcom are the names that repeat here. Read pressure, flow and whether the dryer and receiver are on the skid. Buying the wrong family will not run the bottles and will not run the toolroom either.
What pressure and flow should I match?
Match the blow molder. Bottle air is often near 40 bar, far above shop pressure, and the flow has to hold that pressure through the cycle. The plate may be in cubic feet or cubic meters. A compressor that makes the pressure at too little flow will not keep up. Hours on the stages belong in the same note, because valves and rings wear. Cooling water and plant voltage are the install facts after the air numbers are right.
Why does oil-free matter on a PET bottle?
The air touches the bottle. Oil from a flooded screw is not acceptable in that process. These machines are built as oil-free stages, usually reciprocating, sometimes as a booster behind other compression. An oil-free compressor still has wear parts: rings, valves and packings. Oil-free does not mean maintenance-free. It means the air path is not an oil-flooded screw. Confirm the construction on the nameplate rather than assuming every large compressor is oil-free.
Does the dryer and receiver come with the skid?
Sometimes, and the listing has to say so. A high-pressure compressor can be sold as the block, with the dryer and the receiver as separate pieces or not at all. Wet air at bottle pressure is a different problem from shop condensate. A missing receiver changes how the molder sees pressure swings. Photos should show the whole frame, not only the compressor body. Ask before you count the system as complete.
What should I inspect on a bottle compressor?
The nameplate for pressure and flow, the stages for leaks and damage, the hours if the panel shows them, and the cooling connections. See whether gauges and controls still respond. Confirm voltage. Look for the dryer and the tank on the same skid. These machines are heavy, so rigging is part of the plan. A fresh paint job does not replace stage hours. Meadoworks lists them from closures, and buyers can inspect before they commit.
Where do I look if I need ordinary shop air?
On the rotary screw group, and then at air dryers if the header has to be dry. This group will not help a toolroom that wants a tank-mounted screw. Shop pressure, oil-flooded airends and variable-speed drives are that other conversation. Wait only if the job is a PET bottle or another process that truly needs oil-free air at high bar. Mixing the two catalogs is the mistake the titles invite.
