Atlas Copco GA 90 (FF 90⁺) Oil-injected Air Compressor

The Atlas Copco GA 90 is the fixed speed oil-injected screw compressor family of the GA 30+-90 series, rated at 90 kW of installed motor power. One family, two branches: the GA 90 itself and the GA 90+ build, each offered as a Pack or a Full Feature unit. Factory pressure versions run from 5.5 bar to 13 bar across the family, and the same duties return in 60 Hz markets under 100 to 175 psig nameplates. This page sets out the complete technical data of every branch and build together with the design details that matter when selecting a compressor in this class.

Each unit arrives as one pre-assembled package, so no separate foundation is needed. A gear-driven screw element, a silenced canopy, and the Elektronikon controller come standard. The result is a machine that delivers 216 to 281 l/s of FAD air at 50 Hz while holding the sound level at the work station to 73 dB(A).

Especificaciones técnicas

Capacity is measured according to ISO 1217, Annex C, Edition 4:2009, with FAD referenced to 7 bar on the 7.5 bar build, 8 bar on the 8.5 bar build, 9.5 bar on the 10 bar build, and 12.5 bar on the 13 bar build.

Installed motor power equals 125 hp on every version. The Pack weighs 1425 kg (3142 lb) and the Full Feature build 1545 kg (3406 lb).

For 60 Hz plants the Atlas Copco GA 90 carries 100, 125, 150, and 175 psig variants. Maximum working pressures reach 7.4, 9.1, 10.8, and 12.5 bar, with capacities of 289, 267, 250, and 228 l/s (613, 565, 530, and 484 cfm). The sound level reads 74 dB(A) at 60 Hz, one decibel above the 50 Hz rating.

The GA 90+ Branch

The family extends into the GA 90+ branch, a 90 kW fixed speed build on a larger frame. Four versions cover 5.5, 7.5, 8.5, and 10 bar at 50 Hz, so sites running lower pressure duties with high flow demand get a wider flow band than the base GA 90 offers.

Capacity follows ISO 1217, Annex C and E, Edition 4 (2009). FAD is referenced to 5.3 bar (77 psig) on the 5.5 bar build and 7.3 bar (106 psig) on the 7.5 bar build. The 8.5 bar build references 8.3 bar (120 psig) and the 10 bar build 9.8 bar (142 psig). Installed motor power equals 125 hp on every version.

At 60 Hz the GA 90+ carries 5.5, 7.4, 9.1, and 10.9 bar nameplates (80, 107, 132, and 158 psig). FAD is referenced to 5.3, 7.2, 8.9, and 10.7 bar, and capacities read 343, 302, 274, and 239 l/s (727, 640, 581, and 506 cfm) at 74 dB(A). Weights stay at 3000 kg (6614 lb) Standard and 3393 kg (7480 lb) Full Feature.

The Standard package of the GA 90+ measures 2800 × 2000 × 2000 mm. With Full Feature the package measures 3700 × 2000 × 2000 mm, and the integrated dryer holds a pressure dewpoint of 3°C (37°F) at dryer reference conditions.

Four Pressure Versions for Every Duty

The 7.5 bar build is the flow leader and suits blowing, conveying, and textile air. The 8.5 bar and 10 bar builds are the everyday choices for assembly plants and packaging halls. The 13 bar build carries the higher duties: injection molding, mineral processing, and workshops that feed both tools and high-pressure equipment from one network.

Choosing a version comes down to the highest pressure consumer on site, since every build shares the same motor and frame. Selecting the lowest pressure that still covers the demand keeps the element working near its best point.

Transmisión por tornillo sin fin y engranajes

Compression happens in an Atlas Copco screw element driven through an enclosed gear system. The gears hold the rotors at their designed speed ratio, so the element runs at its best efficiency point regardless of supply conditions. Because there is no belt to tension and no coupling to slip, transmitted power stays consistent through the service life of the machine.

The element, gears, motor, and coolers share one oil circuit. Synthetic oil carries heat away from the compression chamber, lubricates the bearings, and seals the rotor clearances in a single pass. Large coolers and an oversized fan keep that circuit stable even when ambient temperatures climb.

Elektronikon Control and Full Feature Build

Every GA 90 leaves the factory with the Elektronikon controller on board. It manages loading and unloading, watches service intervals, and protects the machine with automatic shutdowns. Communication modules can connect the compressor to a central system for plants that run several units.

The Full Feature build adds an integrated refrigerant dryer, filtration, and an electronic condensate drain inside the same canopy. Pressure dewpoint of the dryer holds between 2°C and 3°C (36°F to 37°F) at reference conditions. Both builds of the GA 90 share the same 2248 × 1080 × 1955 mm package, so the choice between Pack and Full Feature changes no floor planning.

Service Around the Machine, Not Inside It

All service points sit behind wide canopy panels on one side of the machine. Oil filters, air filter, oil separator, and coolers are reached from standing height. The controller names each service item at its due date, and a phase sequence relay protects the motor against wrong supply rotation.

Where the GA 90 Fits

The GA 90 serves automotive plants, general manufacturing, mining support, and utility rooms that draw a constant baseline of air across every shift. It targets sites with level consumption, where a fixed speed machine running near full load gives the lowest spend per cubic meter of air. Where demand swings, the Compresor de aire con inyección de aceite Atlas Copco GA 250 family and the GA 90 VSD take over with variable speed control.

GA 90 FAQ

How much air does the GA 90 deliver?

At 50 Hz the four versions deliver 281, 275, 250, and 216 l/s at maximum working pressure, measured per ISO 1217 Annex C. In cfm that equals 596, 582, 529, and 458 cfm from the 7.5, 8.5, 10, and 13 bar builds.

What is the difference between the GA 90 and the GA 90+?

The GA 90 covers 7.5 to 13 bar with capacities of 216 to 281 l/s on a 2248 × 1080 × 1955 mm frame. The GA 90+ covers 5.5 to 10 bar with capacities of 253 to 336 l/s on a 2800 × 2000 × 2000 mm frame that grows to 3700 mm with Full Feature.

What is the difference between the Pack and Full Feature builds?

The Pack supplies plant air from the aftercooler alone. The Full Feature build adds an integrated refrigerant dryer and filters inside the same canopy, holding the pressure dewpoint at 2°C to 3°C (36°F to 37°F) on the base branch and 3°C (37°F) on the GA 90+.

How loud is the GA 90 at the work station?

The A-weighted sound pressure level is 73 dB(A) at 50 Hz and 74 dB(A) at 60 Hz, measured one meter from the canopy per ISO 2151 and ISO 9614. Every GA 90+ version reads 74 dB(A) on both frequencies.

What electrical supply does the GA 90 need?

Atlas Copco builds the family for standard 50 Hz and 60 Hz industrial supplies, with voltage options matched to the destination market. A phase sequence relay prevents start-up against reversed supply rotation.

How heavy is the GA 90 and does it need a foundation?

The Pack weighs 1425 kg and the Full Feature build 1545 kg. The GA 90+ weighs 3000 kg Standard and 3393 kg Full Feature. All versions sit on a structural skid that spreads the load evenly, so no special foundation is required on a level industrial floor.