Rotary screw compressors
The primary plant air page: Sullair models, sizing table, and the CFM estimator.
Size your plant air
Industry: Manufacturing
Compressed Air Systems for Manufacturing and Production
- Since 1978
- Sullair dealer since 1984
- 14 locations
- under 2 hour response
Plant Air Spec Plate
- Sizing basis
- Simultaneous CFM + 30%
- Typical loss
- 20 to 30% to leaks
- Energy share
- 75% of 10 yr cost
- Control
- VSD trim + fixed base
- Dealer
- Sullair since 1984
How do I size compressed air for a manufacturing plant?
Sizing plant air comes down to real simultaneous demand plus headroom, not nameplate totals. Here is the method, and where most plants lose 20 to 30 percent of what they compress.
The manufacturing air lineup
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Rotary Screw
- Range
- 5 to 500 HP
- Pressure
- 100 to 175 psi
- Control
- Fixed speed or VSD
- Use
- Primary plant air
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Oil-Free Rotary Screw
- Air class
- ISO 8573-1 Class 0
- Range
- 25 to 500 HP
- Use
- Paint, electronics, food lines
- Cert
- TUV type tested
-
Air Audits
- Scope
- Demand logging, leak survey
- Output
- kW and CFM profile report
- Basis
- DOE best practices
- Gated
- Nothing, report is yours
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Service and Parts
- Response
- under 2 hr average
- Coverage
- 14 locations
- Parts
- Sullair OEM stocked
- Techs
- Factory trained
45 + Years in Business
14 Midwest Locations
4.7 Star Google Rating
Plant air demand estimator
Enter what you know: drop count or measured CFM, your shift pattern, and your electric rate. The output is a recommended system range with VSD guidance and what leaks are likely costing you. Rule-of-thumb starting point, confirmed by an audit.
Recommended system range
Enter your drop count or CFM above for a starting range.
Run the numbers yourself
- CFM calculator: total simultaneous plant demand across CNC, assembly, and blow-off before sizing a compressor.
- Air receiver tank calculator: size storage so intermittent peaks stop short-cycling and let a VSD trim unit follow the load.
- Compressed air leak calculator: put your electric rate to the DOE 20 to 30 percent leak loss and see the annual dollars.
What compressed air really costs
- 10% of US industrial electricity goes to compressed air Source: US DOE Compressed Air Sourcebook
- 20 to 30% of compressed air is typically lost to leaks Source: US DOE Compressed Air Sourcebook
- 75% of ten year compressor cost is energy, not purchase price Source: CAGI life cycle cost data
- under 2 hr average emergency response across our territory Source: Brabazon dispatch
Where manufacturers use compressed air
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CNC and machine tools
Spindle air, tool changers, and way blow-off on machining centers.
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Pneumatic assembly
Torque tools, presses, and clamps on assembly lines.
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Material handling
Air-actuated diverters, lifts, and vacuum end effectors.
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Blow-off and cleaning
Chip and part blow-off, often the biggest hidden air waster.
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Paint and finishing
Spray booths and dry, oil-controlled air for finish quality.
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Laser and plasma assist
High pressure assist gas and clean cutting air.
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Robotics end effectors
Grippers and vacuum cups on robot cells.
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General plant air
Drops, hose reels, and maintenance air across the floor.
The programs that cut plant air cost
Four frameworks drive almost every saving we find in manufacturing plants. Each one is measurable and none of them is gated behind a form.
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DOE energy best practices
The DOE compressed air sourcebook is the reference we design against: compressed air is roughly 10 percent of US industrial electricity, and right-sizing plus VSD trim control is usually the largest single saving available in the compressor room.
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Leak program
DOE studies put typical leak loss at 20 to 30 percent of compressed air produced. An ultrasonic leak survey with tagged and repaired leaks pays back in months, and the savings are measurable at the meter.
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Compressed air audits
A week of data logging on your existing system shows the real demand profile: peaks, base load, and off-shift waste. The audit report gives you kW and CFM numbers to size against, instead of nameplate guesswork.
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OSHA 1910 basics
Air-side compliance in a plant covers 1910.242(b) blow-off nozzles limited to 30 psi dead-ended, guarding on belt-driven units under 1910.219, and noise exposure management under 1910.95 for compressor rooms.
Featured equipment for manufacturing
For plants in the 25 to 200 HP class, the configuration we install most is a Sullair fixed speed rotary screw carrying base load with a Sullair VSD unit trimming the swings, fed through dry storage and a cycling refrigerated dryer. It holds header pressure within 2 psi and stops the load and unload cycling that wastes energy on single machine systems. Models and the sizing table are on the rotary screw compressor page, and Class 0 processes can add an oil-free machine for the lines that need it.
When a new compressor is the wrong first move: a compressed air audit
before buying often eliminates the need for a bigger compressor entirely, because leak
repair, storage, and control changes free up capacity you already paid for. If your
current system short-cycles or the plant runs fine on weekends at half pressure, book the
audit first and spend the compressor budget only if the data says
to.
Typical project: audit before buying a compressor
Buying capacity back before buying a compressor
A common scenario starts when a metal fabricator asks for a quote on a larger compressor after adding a second laser. A typical Brabazon project logs the system for a week before quoting anything. The data often shows the existing 100 HP machine loaded below 70 percent even at peak, with pressure sag caused by undersized piping to the new laser cell and a leak rate near the DOE typical range. In that case the fix is a piping correction, a leak repair round, and added storage, at a fraction of a new machine's cost, and the compressor purchase moves to the next expansion sized from real audit data instead of a guess.
Plant air support across the upper Midwest
Factory-trained technicians dispatch from 14 branches with an under 2 hour average emergency response. Find your nearest branch:
Questions engineers actually ask us
What size air compressor does a manufacturing plant need?
Size from measured simultaneous demand plus roughly 30 percent headroom, not from adding up nameplate ratings. Machines never all draw peak at once, so a data-logged demand profile or the estimator above gives a realistic range, and an audit before purchase confirms it.
Is a VSD compressor worth the premium for my plant?
Yes if your demand swings between shifts or through the day, which describes most manufacturers. A VSD trim machine matched to a fixed speed base unit typically cuts compressor energy 20 to 35 percent versus load and unload control, and energy is about 75 percent of ten year cost per CAGI.
How much do compressed air leaks actually cost?
DOE studies put typical loss at 20 to 30 percent of compressed air produced, which for a 100 HP system running two shifts is commonly five figures a year in electricity. A leak survey with repairs is almost always the cheapest capacity you can buy.
Should I get a compressed air audit before buying a new compressor?
Yes, and it often eliminates the purchase. A week of demand logging regularly shows that leak repair, storage, and control changes free up the capacity a plant thought it had to buy, and if you do need a machine, the audit sizes it correctly.
What pressure should plant air run at?
Most manufacturing plants need 90 to 105 psi at the point of use, so around 100 to 110 psi at the compressor with tight piping. Every 2 psi of extra pressure costs about 1 percent in compressor energy per DOE, so fixing the one high-pressure user beats raising the whole header.
Who repairs industrial air compressors near me in the Midwest?
Brabazon dispatches factory-trained technicians from 14 locations across Wisconsin, Illinois, Minnesota, and Missouri with an under 2 hour average emergency response. We have serviced industrial compressors since 1978 and stock Sullair OEM parts.
Where to go next
Get a demand-based number before you buy
Send us your drop count and shift pattern, or book a logged audit. An engineer will size the system from real demand and show the leak math at your electric rate.