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LMF supplies high-pressure compressor systems with more than 30 years of experience, used as energy sources for the operation of the airguns. These systems are developed and built according to the special requirements of seismic offshore applications.

Simultaneously with maximum efficiency and top availability the compressor systems used also guarantee minimal maintenance efforts as well as smallest possible dimensions and lowest possible weights. Southern Cross Compressors offers a comprehensive range of seismic compressors on capacities (FAD) ranging from 2 to 78 m³/min (70 to 2,755 cfm).

2 to 6 m³/min (70 to 210 cfm) capacity: 
air-cooled piston compressors designed for permanent operation
8 to 16 m³/min (280 to 560 cfm) capacity: 
water-cooled piston compressors in cross-head design
21 to 78 m³/min (740 to 2,755 cfm) capacity: 
Compound systems as optimal solutions for highest capacities with smallest possible space requirements and weights.

A rotary screw compressor is used to feed the piston compressor with pre-compressed air. Both compressors are directly driven by a centrally located electric motor or diesel engine.

For optimal integration of the compressor aggregates on seismic vessels we offer specifically developed additional components:

Capacity regulation

In order to save energy and avoid the release of compressed air, the compressors may be equipped with continuously variable capacity controls. The revolutions of electrically driven compressors are controlled via frequency converters. Diesel systems may also be controlled with a combined regulation of revolutions and inlet air quantity within a range of 50 to 100 % of the capacity.

Pressure regulation

Depending on the actual pressure in the high-pressure reservoir, the operation mode is controlled by up to 3 compressor aggregates.


A manifold with all required locking and monitoring facilities is used to feed all airguns installed. In order to avoid pressure surges that might compromise operation safety, the locking fittings are operated pneumatically.

Additional equipment

All additional components such as relief valves, filters, pressure reservoirs etc. can also be supplied and integrated into the pressure control of the units as part of an overall concept.