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What Plant Air Has to Do
Compressed air drying for tools, machine tools, cutting, automation and blasting
A manufacturing plant runs one compressed air system for many jobs at once: impact wrenches and grinders on the floor, spindle purge and tool changers on the machining centers, assist air on a plasma or laser table, valve islands and grippers in the robot cells, and a blast cabinet in the corner. They share a header, so they share a dryer, and the dryer has to satisfy the fussiest of them. For almost every job on this floor that is a 38°F pressure dew point, ISO 8573-1 class 4, delivered by a refrigerated dryer sized to the compressor's full output in the compressor room's summer temperature. Laser assist air is the exception, and its page says so.
- One dryer at the compressor room, after the receiver, sized to the compressor: 65 to 250 SCFM for 15 to 50 hp, 300 to 1,250 SCFM for 60 to 250 hp
- 1 micron coalescing prefilter ahead of the dryer, 0.01 micron oil-removal afterfilter behind it, zero-loss drains at every low point
- Cycling dryers where demand swings with tools and cells; non-cycling where the compressor runs loaded across two or three shifts
Five Applications
Pick the Page for Your Line
Each detail page below opens with the air-using equipment on the line and what water and oil do to it, then gives the compressor size and flow behind it, the dew point and ISO class it needs, where the dryer and filters go, whether cycling or non-cycling suits the duty pattern, and a table of the series that fit. Most manufacturing duties land on the DXR and HPRB non-cycling series, the FLXA, TMC and NXC cycling series, and the GFN and NGF filter families, with the HHPR and APET high-pressure dryers where a booster feeds a laser.
One Dryer at the Compressor Room
The plant that grew one compressor at a time usually ends up with a dryer that was sized for the first one. The fix is not a dryer per department; it is one dryer downstream of the point where the compressors join, sized for their combined delivery, or one dryer per compressor where they sit in different rooms. Pipe it after the receiver so the bulk water has already dropped out and the flow is smoothed, put the 1 micron prefilter directly ahead of it and the 0.01 micron oil-removal filter directly behind it, and give it a bypass so an element change does not stop the plant.
Sizing is arithmetic, not guesswork. A 40 hp screw delivers 170 to 180 SCFM; in a 100°F compressor room that is the 185 to 200 SCFM dryer, and in a 110°F room the ambient factor of 0.88 pushes it to the 230 or 250 SCFM size. A compressor whose aftercooler has plugged with dust can deliver 120°F air and cut the dryer to 65 percent of its rating without anyone touching a setting, which is why inlet temperature is measured on the hottest afternoon before a dryer is blamed.
Series That Carry Manufacturing Duty
Shops to 50 SCFM: the HPRB non-cycling cabinet dryers and the smallest DXR sizes. Plants to 250 SCFM: the DXR non-cycling series where the compressor runs loaded all shift, the TMC and NXC cycling series where tools and cells make the load swing. Plants to 1,250 SCFM and beyond: the DXR sizes to 4,200 SCFM, the FLXA cycling series to 2,000 SCFM and the AES digital-scroll dryers to 10,000 SCFM. The cycling versus non-cycling page shows where the crossover falls.
Around the dryer: GFN and NGF prefilter and afterfilter pairs matched to every dryer size, HF housings for the larger plants, GF WS centrifugal separators ahead of the dryer on wet systems, ND zero-loss drains on the receiver, dryer and filter bowls, and the 1701 single-body bypass on dryers to 35 SCFM. A laser cell fed by a booster adds an HHPR or APET high-pressure dryer and a desiccant stage. All of it is on the refrigerated dryers and accessories pages.
Typical Range Across Manufacturing Applications
Starting points, not limits. Flow is the compressor's delivery at 100 to 125 psig; the dryer is corrected for inlet and ambient temperature before it is ordered.
| APPLICATION | TYPICAL COMPRESSOR | DELIVERED FLOW | DEW POINT NEEDED | DRYER BAND THAT FITS |
| Pneumatic tools & controls | 10–100 hp rotary screw | 40–450 SCFM | 38°F class 4; desiccant for outdoor control air | 20–250 cycling, 300–1,250 |
| CNC & machining | 15–75 hp rotary screw | 65–350 SCFM | 38°F class 4 | 65–250 SCFM |
| Laser & plasma cutting | 10–30 hp (plasma); 25–100 hp plus booster (laser) | 40–450 SCFM | Plasma 38°F class 4; laser assist –40°F class 2 desiccant after a refrigerated first stage | 65–250, high pressure |
| Robotics & automation | 15–75 hp rotary screw | 65–350 SCFM | 38°F class 4; class 3 oil for proportional valves | 20–250 cycling, 300–1,250 cycling |
| Blasting & surface prep | 50–250 hp rotary screw or portable | 175–1,250 SCFM | 38°F class 4; clean blotter test for oil and water | 300–1,250 SCFM |
Drying a whole plant from one compressor room
If the new compressor sits in its own room and feeds the header from a different point, yes: give it a dryer sized for that compressor, so wet air never enters the header from either end. Where both compressors discharge into one room, pipe them together first and run a single dryer sized for their combined delivery. The mistake is tying an undried compressor into a dried header, which wets every drop downstream of the tie-in.
A few psi in total, and each one matters because the compressor has to make it up. A rule used across the industry is about 1 percent of compressor power for every 2 psi of added discharge pressure. Clean filters sized for full flow sit under 2 psi each, and the dryer adds a few more at its rating. Undersized housings, or elements left long past their change point, are where plants quietly loose the most.
It changes the duty pattern the dryer sees. A variable-speed screw tracks demand, so through nights, weekends and light shifts it delivers a fraction of its nameplate air, while a non-cycling dryer keeps its refrigeration compressor running flat out regardless. A cycling dryer follows the lower load and saves the power. Size it for the compressor's full delivery all the same, because the compressor will reach full speed on the hottest, busiest afternoon.
When liquid arrives at the dryer in quantity: a compressor with a weak or remote aftercooler, a long run between receiver and dryer, or a system that throws slugs after a weekend shutdown. The separator spins out bulk water so the coalescing prefilter is not flooded and the dryer handles vapor rather than puddles. Give it a zero-loss drain of its own; a separator with a manual valve fills up and passes its water straight on.
They can share the dryer if it is sized for the compressor that feeds both, but they should not share a branch. A blast nozzle draws hundreds of SCFM the moment it opens and drags header pressure down, which shows up in the cells as weak grippers and drifting regulators. Run the blast room on its own line from the compressor room, ideally with a receiver near the pot, and keep the cells on a separate branch.
