Atlas Copco GA VSD+ Series Oil-Injected Rotary Screw Compressor

Overview

The Atlas Copco GA VSD+ series is a range of oil-injected rotary screw air compressors built around variable speed drive (VSD) technology, delivering compressed air at 5.5–37 kW motor power with working pressures from 4 to 13 bar(g). Rather than running at a fixed speed and unloading excess capacity, the GA VSD+ continuously matches motor speed to real-time plant air demand, which Atlas Copco reports can cut specific energy consumption by up to 60% compared to conventional fixed-speed screw compressors of the same class. This makes the GA VSD+ one of the most widely specified mid-range compressors for industrial facilities that need dependable, moisture-controlled compressed air without paying for capacity they are not using.

As an experienced supply partner for Atlas Copco equipment, Seven Star LLC supplies the Atlas Copco GA VSD+ range to industrial plants, workshops, and utilities across Oman and the wider GCC, with technical support and selection guidance suited to the region’s demanding ambient conditions.

Operating Principle

The Atlas Copco GA VSD+ uses a twin-screw oil-injected airend in which two asymmetric rotors mesh together, trapping and progressively compressing air as the rotor volume decreases along the length of the casing. Injected oil lubricates the meshing rotors, seals the internal clearances, and absorbs the heat of compression in a single pass, which allows the airend to run efficiently at a single-stage compression ratio while keeping discharge temperatures within a safe operating band. A permanent-magnet or induction motor, controlled through an integrated variable speed drive, continuously adjusts rotor rotational speed rather than cycling the compressor on and off, so output flow tracks demand smoothly instead of in large discrete steps.

Because compression is continuous and speed-matched rather than load/unload based, the GA VSD+ avoids the pressure-band swings and repeated re-starts that waste energy and stress mechanical components in fixed-speed machines. The practical consequence for a plant engineer is a flatter, more stable system pressure at the point of use, fewer artificial pressure-drop losses across the distribution network, and a compressor that spends its operating life closer to its most efficient speed rather than idling at full RPM while unloaded.

Engineering Design of Atlas Copco GA VSD+

The Atlas Copco GA VSD+ is built as a fully packaged, sound-attenuated cabinet with a fully welded steel base frame, so the compressor, motor, drive electronics, air/oil separation vessel, and cooling package all ship and install as a single unit requiring only power, air outlet, and (for water-cooled variants) cooling water connections. The Smart Temperature Control System manages oil injection temperature dynamically to prevent condensation inside the airend across varying ambient and load conditions, which matters directly for GCC sites that see wide daily temperature swings between air-conditioned plant rooms and hot outdoor compressor houses.

Operator interaction runs through the Elektronikon Touch multilingual color display, which shows real-time pressure, temperature, service countdowns, and fault diagnostics, and which connects outward through Atlas Copco SMARTLINK remote monitoring and OPC UA protocol support for integration into a plant SCADA, DCS, or building management system. Elephant-foot vibration-damping mounts, front-access panels for filter and oil-separator servicing, and a compact footprint keep both installation and ongoing maintenance straightforward in retrofitted plant rooms where floor space is already constrained.

Key Features

The Atlas Copco GA VSD+ combines variable speed control with proven oil-injected screw technology to deliver measurable efficiency gains without compromising reliability. Its core features, standard across the Atlas Copco GA VSD+ range, include:

• Variable speed drive control that matches motor speed to real-time air demand, cutting specific energy consumption by up to 60% versus fixed-speed compressors of comparable output.
• Motor power range of 5.5–37 kW covering flow rates from roughly 20.9 to 470.7 m³/h (12.3–277 cfm) across the series.
• Working pressure range of 4–13 bar(g), configurable to match plant-specific pneumatic tooling, instrumentation air, or process requirements.
• Smart Temperature Control System with full injection temperature management to eliminate internal condensation risk across varying ambient conditions.
• Boost Flow Mode for temporary capacity increases during peak demand without a separate standby compressor.
• Free Air Delivery increase of up to 21% compared to fixed-speed alternatives of the same nominal motor rating.
• Sound levels as low as 63 dB(A), enabling installation directly on the production floor rather than in a dedicated remote plant room.
• Elektronikon Touch controller with SMARTLINK connectivity and OPC UA protocol support for remote monitoring and SCADA/DCS/BMS integration.

Industrial Applications

The Atlas Copco GA VSD+ is deployed across oil & gas support facilities, petrochemical plants, food and beverage processing, automotive workshops, and general manufacturing throughout the Sultanate of Oman, where compressed air demand typically fluctuates through the working day rather than staying constant, making variable speed operation directly relevant to real operating costs. In Muscat’s light-industrial zones and the growing manufacturing base around the Sohar and Salalah free zones, plant engineers use the GA VSD+ to stabilize instrument air pressure for pneumatic actuators and control valves while reducing the electrical load contribution of compressed air generation, which is frequently one of the largest single utility costs in a processing facility.

With engineering support in Muscat, Seven Star LLC supplies and supports the GA VSD+ range for desalination plants, cement and construction material producers, and marine and port maintenance workshops across the region, where humidity, ambient heat, and dust loading make reliable temperature control and low-maintenance filtration especially important. Facilities operating multiple compressors also benefit from the GA VSD+’s SMARTLINK and Elektronikon Touch connectivity, which allows a single control room to sequence several units for optimal overall system efficiency rather than treating each compressor as an isolated asset.

Technical Specifications

The table below summarizes the key operating parameters of the Atlas Copco GA VSD+ series; exact figures vary by the specific model within the range.

Request a Quote for Atlas Copco GA VSD+ Series Oil-Injected Rotary Screw Compressor

Facility engineers and procurement teams evaluating compressed air upgrades can request a formal RFQ for the Atlas Copco GA VSD+ series, and the Atlas Copco GA VSD+ directly from Seven Star LLC, with current availability and lead time, technical datasheets, and application sizing support available on request. Backed by manufacturer datasheet documentation, Seven Star LLC’s instrumentation and rotating equipment division can advise on the correct model within the GA VSD+ range for a given flow, pressure, and duty-cycle profile, and coordinate installation, commissioning, and preventive maintenance contracts to keep compressed air systems running at their designed efficiency.

Browse the full Atlas Copco range or see more Compressor products supplied by Seven Star LLC in Oman and the GCC.