Oil-free rotary screw compressors

Class 0 air with no oil anywhere in the compression chamber.

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Technical data

Free air delivery: 0.3 – 65.5 m³/min (11 – 2,313 cfm)
Working pressure: 5 – 13 bar g
Motor power: 7 – 355 kW
Weight: 300 – 7,600 kg
Noise level: 61 – 71 dB(A)

Overview

There is an important difference between air that has been filtered until it is nearly oil-free and air that never touched oil. If your product is food, medicine, electronics or textiles, only the second one protects you, a filter element that fails silently does not announce itself until the batch is ruined.

Green Air oil-free screw compressors use precision-timed rotors that never touch each other or any lubricant. The result is certified ISO 8573-1 Class 0 air: not a low oil content, but no measurable oil content at all.

Key benefits

Certified Class 0

Independently tested to ISO 8573-1 Class 0 for total oil, including vapour. Certificate supplied with every machine.

No condensate to treat

Nothing oily leaves the machine, so there is no oil-water separator to buy, maintain or explain to an environmental inspector.

No filtration pressure drop

You are not pushing air through three stages of coalescing filters, which typically saves 0.4 bar and the energy that goes with it.

Lower risk, not just lower oil

Removes the single point of failure that ruins batches in food, pharma and electronics plants.

How it is built

Two rotors turn in the housing without ever touching each other and without any lubricant between them. Timing gears hold the clearance, and the clearance is held by manufacturing accuracy rather than by a film of oil.

Because nothing is sprayed into the chamber to carry heat away, the heat has to leave through the casing and the intercooler instead. That is why an oil free machine is physically larger than an oil injected one of the same output, and why the cooling design is the part that decides how long it lasts.

The rotor coating is the wearing part, not a bearing surface. Kept within its temperature limits it lasts many years, and the controller exists largely to keep it there.

Timed rotors that never touch
No lubricant anywhere in the air path
Certified to ISO 8573-1 Class 0
Intercooling between stages
Air cooled or water cooled
No oil water separator needed downstream
No coalescing filter pressure drop to pay for
Variable speed available

What the controller does

The controller watches the temperatures that matter to a coated rotor and shuts the machine down before they matter, which is a different job from the one a controller does on an oil injected machine.

Pressure, load, running hours, both stage temperatures and the service countdown are on the home screen. The stage temperature trend is the number an engineer reads, because it moves long before anything fails.

It sequences with other machines, holds a pressure band rather than a single number, and runs to a shift clock so the plant is not making Class 0 air at three in the morning for nobody.

Both stage temperatures monitored and trended
Pressure band control
Service countdown in hours
Sequencing with other machines
Shift clock for start and stop
Remote monitoring as standard
Fault history kept on the machine
Automatic restart after a power failure

Parts and service kits

Kits for an oil free machine are mostly filters, seals and bearing service rather than separators and fluid, because there is no oil in the air path to separate.

The gearbox and the bearings are the scheduled items. They are changed on hours rather than on condition, and doing that on time is what keeps a rotor coating intact.

Every kit is confirmed against the serial number. We also supply the Class 0 certificate with the machine and again after any work that could affect it, because an audit will ask for it.

Air filters and seal kits by interval
Scheduled bearing and gearbox service
Intercooler clean included
Class 0 certificate supplied and reissued after works
Confirmed against your serial number
Local stock in every country we trade in
Airend exchange available
Fixed price under a service plan

Model range

Model	Motor power	Free air delivery	Working pressure	Connection	Noise level	Weight	Dimensions L x W x H
Air cooled
GAC-F 15	15 kW / 20 hp	2.30 m³/min	8 bar g		68 dB(A)	672 kg	1309 × 848 × 1612 mm
GAC-F 22	22 kW / 30 hp	3.50 m³/min	8 bar g		68 dB(A)	691 kg	1309 × 848 × 1612 mm
GAC-F 37	37 kW / 50 hp	5.86 m³/min	8 bar g		71 dB(A)	960 kg	1686 × 886 × 1657 mm
Water cooled
GAC-F 15	15 kW / 20 hp	2.30 m³/min	8 bar g		65 dB(A)	624 kg	1309 × 848 × 1612 mm
GAC-F 22	22 kW / 30 hp	3.50 m³/min	8 bar g		65 dB(A)	643 kg	1309 × 848 × 1612 mm
GAC-F 37	37 kW / 50 hp	5.86 m³/min	8 bar g		61 dB(A)	860 kg	1686 × 886 × 1657 mm
Variable speed
GAC-FV 15Variable speed, cooling configuration specified in quotation	15 kW / 20 hp	0.32 – 2.34 m³/min	5 – 10 bar g		67 dB(A)	687 kg	1309 × 848 × 1612 mm
GAC-FV 22Variable speed, cooling configuration specified in quotation	22 kW / 30 hp	0.68 – 3.45 m³/min	5 – 10 bar g		67 dB(A)	687 kg	1309 × 848 × 1612 mm
GAC-FV 37Variable speed, cooling configuration specified in quotation	37 kW / 50 hp	1.09 – 6.87 m³/min	5 – 10 bar g		71 dB(A)	995 kg	1722 × 920 × 1659 mm
GAC series, fixed speed
GAC7	7.5 kW / 10 hp	1.20 m³/min (42.4 cfm)	8 bar g	G 1/4		≈ 300 kg	1000 × 700 × 1220 mm
GAC7	7.5 kW / 10 hp	1.00 m³/min (35.3 cfm)	10 bar g	G 1/4		≈ 300 kg	1000 × 700 × 1220 mm
GAC7	7.5 kW / 10 hp	0.80 m³/min (28.3 cfm)	13 bar g	G 1/4		≈ 300 kg	1000 × 700 × 1220 mm
GAC11	11 kW / 15 hp	2.00 m³/min (70.6 cfm)	8 bar g	G 1/4		≈ 350 kg	1200 × 750 × 1400 mm
GAC11	11 kW / 15 hp	1.80 m³/min (63.6 cfm)	10 bar g	G 1/4		≈ 350 kg	1200 × 750 × 1400 mm
GAC11	11 kW / 15 hp	1.60 m³/min (56.5 cfm)	13 bar g	G 1/4		≈ 350 kg	1200 × 750 × 1400 mm
GAC15	15 kW / 20 hp	2.88 m³/min (101.7 cfm)	8 bar g	G 1/4		≈ 600 kg	1250 × 750 × 1400 mm
GAC15	15 kW / 20 hp	2.41 m³/min (85.1 cfm)	10 bar g	G 1/4		≈ 600 kg	1250 × 750 × 1400 mm
GAC15	15 kW / 20 hp	2.02 m³/min (71.3 cfm)	13 bar g	G 1/4		≈ 600 kg	1250 × 750 × 1400 mm
GAC22	22 kW / 30 hp	3.97 m³/min (140.2 cfm)	8 bar g	G 1		≈ 650 kg	1250 × 750 × 1400 mm
GAC22	22 kW / 30 hp	3.43 m³/min (121.1 cfm)	10 bar g	G 1		≈ 650 kg	1250 × 750 × 1400 mm
GAC22	22 kW / 30 hp	3.02 m³/min (106.7 cfm)	13 bar g	G 1		≈ 650 kg	1250 × 750 × 1400 mm
GAC30	30 kW / 40 hp	5.20 m³/min (183.6 cfm)	8 bar g	G 1 1/2		≈ 850 kg	1650 × 850 × 1650 mm
GAC30	30 kW / 40 hp	4.72 m³/min (166.7 cfm)	10 bar g	G 1 1/2		≈ 850 kg	1650 × 850 × 1650 mm
GAC30	30 kW / 40 hp	4.29 m³/min (151.5 cfm)	13 bar g	G 1 1/2		≈ 850 kg	1650 × 850 × 1650 mm
GAC37	37 kW / 50 hp	6.70 m³/min (236.6 cfm)	8 bar g	G 1 1/2		≈ 950 kg	1650 × 850 × 1650 mm
GAC37	37 kW / 50 hp	6.08 m³/min (214.7 cfm)	10 bar g	G 1 1/2		≈ 950 kg	1650 × 850 × 1650 mm
GAC37	37 kW / 50 hp	4.88 m³/min (172.3 cfm)	13 bar g	G 1 1/2		≈ 950 kg	1650 × 850 × 1650 mm
GAC45	45 kW / 60 hp	8.24 m³/min (291.0 cfm)	8 bar g	G 1 1/2		≈ 1,250 kg	1650 × 850 × 1650 mm
GAC45	45 kW / 60 hp	7.40 m³/min (261.3 cfm)	10 bar g	G 1 1/2		≈ 1,250 kg	1650 × 850 × 1650 mm
GAC45	45 kW / 60 hp	6.20 m³/min (219.0 cfm)	13 bar g	G 1 1/2		≈ 1,250 kg	1650 × 850 × 1650 mm
GAC55	55 kW / 75 hp	10.52 m³/min (371.5 cfm)	8 bar g	G 2		≈ 1,550 kg	1850 × 1050 × 1800 mm
GAC55	55 kW / 75 hp	8.90 m³/min (314.3 cfm)	10 bar g	G 2		≈ 1,550 kg	1850 × 1050 × 1800 mm
GAC55	55 kW / 75 hp	8.00 m³/min (282.5 cfm)	13 bar g	G 2		≈ 1,550 kg	1850 × 1050 × 1800 mm
GAC75	75 kW / 100 hp	14.36 m³/min (507.1 cfm)	8 bar g	G 2		≈ 1,750 kg	2050 × 1050 × 1850 mm
GAC75	75 kW / 100 hp	12.02 m³/min (424.5 cfm)	10 bar g	G 2		≈ 1,750 kg	2050 × 1050 × 1850 mm
GAC75	75 kW / 100 hp	10.34 m³/min (365.2 cfm)	13 bar g	G 2		≈ 1,750 kg	2050 × 1050 × 1850 mm
GAC90	90 kW / 125 hp	16.20 m³/min (572.1 cfm)	8 bar g	G 2		≈ 2,050 kg	2050 × 1050 × 1850 mm
GAC90	90 kW / 125 hp	14.52 m³/min (512.8 cfm)	10 bar g	G 2		≈ 2,050 kg	2050 × 1050 × 1850 mm
GAC90	90 kW / 125 hp	12.60 m³/min (445.0 cfm)	13 bar g	G 2		≈ 2,050 kg	2050 × 1050 × 1850 mm
GAC110	110 kW / 150 hp	22.0 m³/min (776.9 cfm)	8 bar g			≈ 2,515 kg	On request
GAC110	110 kW / 150 hp	19.1 m³/min (674.5 cfm)	10 bar g			≈ 2,515 kg	On request
GAC110	110 kW / 150 hp	15.5 m³/min (547.4 cfm)	13 bar g			≈ 2,515 kg	On request
GAC132	132 kW / 175 hp	26.0 m³/min (918.2 cfm)	8 bar g			≈ 3,025 kg	On request
GAC132	132 kW / 175 hp	22.0 m³/min (776.9 cfm)	10 bar g			≈ 3,025 kg	On request
GAC132	132 kW / 175 hp	18.8 m³/min (663.9 cfm)	13 bar g			≈ 3,025 kg	On request
GAC160	160 kW / 215 hp	30.3 m³/min (1070.0 cfm)	8 bar g			≈ 3,225 kg	On request
GAC160	160 kW / 215 hp	26.6 m³/min (939.4 cfm)	10 bar g			≈ 3,225 kg	On request
GAC160	160 kW / 215 hp	22.5 m³/min (794.6 cfm)	13 bar g			≈ 3,225 kg	On request
GAC200	200 kW / 270 hp	38.0 m³/min (1342.0 cfm)	8 bar g			≈ 4,727 kg	On request
GAC200	200 kW / 270 hp	36.0 m³/min (1271.3 cfm)	10 bar g			≈ 4,727 kg	On request
GAC200	200 kW / 270 hp	28.1 m³/min (992.3 cfm)	13 bar g			≈ 4,727 kg	On request
GAC250	250 kW / 335 hp	45.7 m³/min (1613.9 cfm)	8 bar g			≈ 5,017 kg	On request
GAC250	250 kW / 335 hp	39.8 m³/min (1405.5 cfm)	10 bar g			≈ 5,017 kg	On request
GAC250	250 kW / 335 hp	33.0 m³/min (1165.4 cfm)	13 bar g			≈ 5,017 kg	On request
GAC315	315 kW / 430 hp	56.0 m³/min (1977.6 cfm)	8 bar g			≈ 6,625 kg	On request
GAC315	315 kW / 430 hp	50.8 m³/min (1794.0 cfm)	10 bar g			≈ 6,625 kg	On request
GAC315	315 kW / 430 hp	45.7 m³/min (1613.9 cfm)	13 bar g			≈ 6,625 kg	On request
GAC355	355 kW / 485 hp	65.5 m³/min (2313.1 cfm)	8 bar g			≈ 7,600 kg	On request
GAC355	355 kW / 485 hp	55.2 m³/min (1949.4 cfm)	10 bar g			≈ 7,600 kg	On request
GAC355	355 kW / 485 hp	49.6 m³/min (1751.6 cfm)	13 bar g			≈ 7,600 kg	On request
GAC VSD series, variable speed
GAC7VSD	7 kW / 10 hp	0.3 – 1.2 m³/min	13 bar g	G 3/4		≈ 450 kg	On request
GAC11VSD	11 kW / 15 hp	0.3 – 2.0 m³/min	13 bar g	G 1/4		≈ 550 kg	On request
GAC15VSD	15 kW / 20 hp	0.5 – 2.8 m³/min	13 bar g	G 1		≈ 650 kg	On request
GAC22VSD	22 kW / 30 hp	0.7 – 4.02 m³/min	13 bar g	G 1		≈ 750 kg	On request
GAC30VSD	30 kW / 40 hp	1.16 – 5.5 m³/min	13 bar g	G 1		≈ 950 kg	On request
GAC37VSD	37 kW / 50 hp	1.54 – 6.70 m³/min	13 bar g	G 1 1/2		≈ 1,250 kg	On request
GAC45VSD	45 kW / 60 hp	1.54 – 8.04 m³/min	13 bar g	G 1 1/2		≈ 1,450 kg	On request
GAC55VSD	55 kW / 75 hp	1.54 – 10.5 m³/min	13 bar g	G 2		≈ 1,650 kg	On request
GAC75VSD	75 kW / 100 hp	2.52 – 15.0 m³/min	13 bar g	G 2		≈ 1,950 kg	On request
GAC90VSD	90 kW / 125 hp	2.52 – 16.5 m³/min	13 bar g	G 2		≈ 2,350 kg	On request
GAC110VSD	110 kW / 150 hp	3.77 – 22.0 m³/min	13 bar g	G 3		≈ 2,615 kg	On request
GAC132VSD	132 kW / 175 hp	3.77 – 26.0 m³/min	13 bar g	G 3		≈ 3,125 kg	On request
GAC160VSD	160 kW / 215 hp	4.0 – 30.3 m³/min	13 bar g	G 4		≈ 3,425 kg	On request
GAC200VSD	200 kW / 270 hp	10.0 – 38.0 m³/min	13 bar g	G 4		≈ 4,827 kg	On request
GAC250VSD	250 kW / 335 hp	10.0 – 45.7 m³/min	13 bar g	G 4		≈ 5,117 kg	On request

Air cooled

GAC-F 1515 kW / 20 hp

8 bar g: 2.30 m³/min

Noise level: 68 dB(A)
Weight: 672 kg
Dimensions L x W x H: 1309 × 848 × 1612 mm

GAC-F 2222 kW / 30 hp

8 bar g: 3.50 m³/min

Noise level: 68 dB(A)
Weight: 691 kg
Dimensions L x W x H: 1309 × 848 × 1612 mm

GAC-F 3737 kW / 50 hp

8 bar g: 5.86 m³/min

Noise level: 71 dB(A)
Weight: 960 kg
Dimensions L x W x H: 1686 × 886 × 1657 mm

Water cooled

GAC-F 1515 kW / 20 hp

8 bar g: 2.30 m³/min

Noise level: 65 dB(A)
Weight: 624 kg
Dimensions L x W x H: 1309 × 848 × 1612 mm

GAC-F 2222 kW / 30 hp

8 bar g: 3.50 m³/min

Noise level: 65 dB(A)
Weight: 643 kg
Dimensions L x W x H: 1309 × 848 × 1612 mm

GAC-F 3737 kW / 50 hp

8 bar g: 5.86 m³/min

Noise level: 61 dB(A)
Weight: 860 kg
Dimensions L x W x H: 1686 × 886 × 1657 mm

Variable speed

GAC-FV 15Variable speed, cooling configuration specified in quotation15 kW / 20 hp

5 – 10 bar g: 0.32 – 2.34 m³/min

Noise level: 67 dB(A)
Weight: 687 kg
Dimensions L x W x H: 1309 × 848 × 1612 mm

GAC-FV 22Variable speed, cooling configuration specified in quotation22 kW / 30 hp

5 – 10 bar g: 0.68 – 3.45 m³/min

Noise level: 67 dB(A)
Weight: 687 kg
Dimensions L x W x H: 1309 × 848 × 1612 mm

GAC-FV 37Variable speed, cooling configuration specified in quotation37 kW / 50 hp

5 – 10 bar g: 1.09 – 6.87 m³/min

Noise level: 71 dB(A)
Weight: 995 kg
Dimensions L x W x H: 1722 × 920 × 1659 mm

GAC series, fixed speed

GAC77.5 kW / 10 hp

8 bar g: 1.20 m³/min (42.4 cfm)
10 bar g: 1.00 m³/min (35.3 cfm)
13 bar g: 0.80 m³/min (28.3 cfm)

Connection: G 1/4
Weight: ≈ 300 kg
Dimensions L x W x H: 1000 × 700 × 1220 mm

GAC1111 kW / 15 hp

8 bar g: 2.00 m³/min (70.6 cfm)
10 bar g: 1.80 m³/min (63.6 cfm)
13 bar g: 1.60 m³/min (56.5 cfm)

Connection: G 1/4
Weight: ≈ 350 kg
Dimensions L x W x H: 1200 × 750 × 1400 mm

GAC1515 kW / 20 hp

8 bar g: 2.88 m³/min (101.7 cfm)
10 bar g: 2.41 m³/min (85.1 cfm)
13 bar g: 2.02 m³/min (71.3 cfm)

Connection: G 1/4
Weight: ≈ 600 kg
Dimensions L x W x H: 1250 × 750 × 1400 mm

GAC2222 kW / 30 hp

8 bar g: 3.97 m³/min (140.2 cfm)
10 bar g: 3.43 m³/min (121.1 cfm)
13 bar g: 3.02 m³/min (106.7 cfm)

Connection: G 1
Weight: ≈ 650 kg
Dimensions L x W x H: 1250 × 750 × 1400 mm

GAC3030 kW / 40 hp

8 bar g: 5.20 m³/min (183.6 cfm)
10 bar g: 4.72 m³/min (166.7 cfm)
13 bar g: 4.29 m³/min (151.5 cfm)

Connection: G 1 1/2
Weight: ≈ 850 kg
Dimensions L x W x H: 1650 × 850 × 1650 mm

GAC3737 kW / 50 hp

8 bar g: 6.70 m³/min (236.6 cfm)
10 bar g: 6.08 m³/min (214.7 cfm)
13 bar g: 4.88 m³/min (172.3 cfm)

Connection: G 1 1/2
Weight: ≈ 950 kg
Dimensions L x W x H: 1650 × 850 × 1650 mm

GAC4545 kW / 60 hp

8 bar g: 8.24 m³/min (291.0 cfm)
10 bar g: 7.40 m³/min (261.3 cfm)
13 bar g: 6.20 m³/min (219.0 cfm)

Connection: G 1 1/2
Weight: ≈ 1,250 kg
Dimensions L x W x H: 1650 × 850 × 1650 mm

GAC5555 kW / 75 hp

8 bar g: 10.52 m³/min (371.5 cfm)
10 bar g: 8.90 m³/min (314.3 cfm)
13 bar g: 8.00 m³/min (282.5 cfm)

Connection: G 2
Weight: ≈ 1,550 kg
Dimensions L x W x H: 1850 × 1050 × 1800 mm

GAC7575 kW / 100 hp

8 bar g: 14.36 m³/min (507.1 cfm)
10 bar g: 12.02 m³/min (424.5 cfm)
13 bar g: 10.34 m³/min (365.2 cfm)

Connection: G 2
Weight: ≈ 1,750 kg
Dimensions L x W x H: 2050 × 1050 × 1850 mm

GAC9090 kW / 125 hp

8 bar g: 16.20 m³/min (572.1 cfm)
10 bar g: 14.52 m³/min (512.8 cfm)
13 bar g: 12.60 m³/min (445.0 cfm)

Connection: G 2
Weight: ≈ 2,050 kg
Dimensions L x W x H: 2050 × 1050 × 1850 mm

GAC110110 kW / 150 hp

8 bar g: 22.0 m³/min (776.9 cfm)
10 bar g: 19.1 m³/min (674.5 cfm)
13 bar g: 15.5 m³/min (547.4 cfm)

Weight: ≈ 2,515 kg

GAC132132 kW / 175 hp

8 bar g: 26.0 m³/min (918.2 cfm)
10 bar g: 22.0 m³/min (776.9 cfm)
13 bar g: 18.8 m³/min (663.9 cfm)

Weight: ≈ 3,025 kg

GAC160160 kW / 215 hp

8 bar g: 30.3 m³/min (1070.0 cfm)
10 bar g: 26.6 m³/min (939.4 cfm)
13 bar g: 22.5 m³/min (794.6 cfm)

Weight: ≈ 3,225 kg

GAC200200 kW / 270 hp

8 bar g: 38.0 m³/min (1342.0 cfm)
10 bar g: 36.0 m³/min (1271.3 cfm)
13 bar g: 28.1 m³/min (992.3 cfm)

Weight: ≈ 4,727 kg

GAC250250 kW / 335 hp

8 bar g: 45.7 m³/min (1613.9 cfm)
10 bar g: 39.8 m³/min (1405.5 cfm)
13 bar g: 33.0 m³/min (1165.4 cfm)

Weight: ≈ 5,017 kg

GAC315315 kW / 430 hp

8 bar g: 56.0 m³/min (1977.6 cfm)
10 bar g: 50.8 m³/min (1794.0 cfm)
13 bar g: 45.7 m³/min (1613.9 cfm)

Weight: ≈ 6,625 kg

GAC355355 kW / 485 hp

8 bar g: 65.5 m³/min (2313.1 cfm)
10 bar g: 55.2 m³/min (1949.4 cfm)
13 bar g: 49.6 m³/min (1751.6 cfm)

Weight: ≈ 7,600 kg

GAC VSD series, variable speed

GAC7VSD7 kW / 10 hp

13 bar g: 0.3 – 1.2 m³/min

Connection: G 3/4
Weight: ≈ 450 kg

GAC11VSD11 kW / 15 hp

13 bar g: 0.3 – 2.0 m³/min

Connection: G 1/4
Weight: ≈ 550 kg

GAC15VSD15 kW / 20 hp

13 bar g: 0.5 – 2.8 m³/min

Connection: G 1
Weight: ≈ 650 kg

GAC22VSD22 kW / 30 hp

13 bar g: 0.7 – 4.02 m³/min

Connection: G 1
Weight: ≈ 750 kg

GAC30VSD30 kW / 40 hp

13 bar g: 1.16 – 5.5 m³/min

Connection: G 1
Weight: ≈ 950 kg

GAC37VSD37 kW / 50 hp

13 bar g: 1.54 – 6.70 m³/min

Connection: G 1 1/2
Weight: ≈ 1,250 kg

GAC45VSD45 kW / 60 hp

13 bar g: 1.54 – 8.04 m³/min

Connection: G 1 1/2
Weight: ≈ 1,450 kg

GAC55VSD55 kW / 75 hp

13 bar g: 1.54 – 10.5 m³/min

Connection: G 2
Weight: ≈ 1,650 kg

GAC75VSD75 kW / 100 hp

13 bar g: 2.52 – 15.0 m³/min

Connection: G 2
Weight: ≈ 1,950 kg

GAC90VSD90 kW / 125 hp

13 bar g: 2.52 – 16.5 m³/min

Connection: G 2
Weight: ≈ 2,350 kg

GAC110VSD110 kW / 150 hp

13 bar g: 3.77 – 22.0 m³/min

Connection: G 3
Weight: ≈ 2,615 kg

GAC132VSD132 kW / 175 hp

13 bar g: 3.77 – 26.0 m³/min

Connection: G 3
Weight: ≈ 3,125 kg

GAC160VSD160 kW / 215 hp

13 bar g: 4.0 – 30.3 m³/min

Connection: G 4
Weight: ≈ 3,425 kg

GAC200VSD200 kW / 270 hp

13 bar g: 10.0 – 38.0 m³/min

Connection: G 4
Weight: ≈ 4,827 kg

GAC250VSD250 kW / 335 hp

13 bar g: 10.0 – 45.7 m³/min

Connection: G 4
Weight: ≈ 5,117 kg

FAD measured to ISO 1217 Edition 4, Annex C and E at 1 bar a intake, 20°C, 0% humidity. Noise measured to ISO 2151 in free field conditions, tolerance ± 3 dB(A). Water-cooled versions of every model are available. Ask us for their sheet.

A weight shown with ≈ is our own estimate from the machine's own dimensions, not a measured figure, and is waiting on the factory. Do not plan a lift or a foundation against it — ask us and the confirmed weight comes with the quotation.

Overall dimensions are supplied for the selected configuration with the quotation and the arrangement drawing. Tell us the model and the duty and we will send them. Ask us

Frequently asked questions

How do the rotors avoid touching without oil?

They are held in mesh by precision timing gears, so they never contact each other or the housing. That is why the tolerances and the price are both higher.

What certificate comes with the machine?

An ISO 8573-1 Class 0 certificate covering total oil content including vapour, issued from independent testing.

What is the rotor coating for?

It seals the small clearances and resists corrosion in place of oil. Coating condition is what the scheduled inspection actually checks.

How long do these machines last?

Comparable to an oil-injected screw when maintained correctly. The wearing items are the bearings, seals and the coating rather than an oil circuit.

Do I lose efficiency compared with oil-injected?

At full load a single-stage oil-free machine is slightly less efficient. Two-stage recovers that and more, which is why most oil-free installations above 37 kW are two-stage.

What air quality do I actually get?

No measurable oil, plus whatever particulate and dew point your downstream treatment provides. Oil-free solves one of the three ISO classes, not all three.

Can I retrofit oil-free instead of my existing machine?

Yes, and it usually simplifies the installation: you can remove the coalescing and carbon filter stages and the oil-water separator with it.

What is the noise level?

Similar to an equivalent oil-injected machine in a canopy. Gearbox noise is the difference and it is contained within the enclosure.

Is a receiver still needed?

Yes, exactly as with any compressor: to steady pressure, catch condensate and stop short-cycling on a fixed-speed unit.

What are the running costs?

Energy dominates as always. Consumables are lower than an oil-injected machine because there is no separator element and no oil, but scheduled interventions are more specialised.

Not sure which model you need?

Send us your air demand, working pressure and running hours. Our engineers will size the machine and send a written recommendation, no cost, no obligation.

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