More screws certified

The open-drive screw compressors in the OS.A95 series also get the DNV GL certificate

The latest certification makes the choice for shipyards easy. The ship classification society DNV GL has now also certified the BITZER screw compressors in the OS.A95 series for use in marine refrigeration systems. As a result, those responsible can now choose from a large range of certified BITZER compressors for use in maritime applications. To obtain this certification, the specialist in refrigeration compressors in Sindelfingen had to verify the source and quality of the materials used, amongst other things.


DNV GL is a ship classification society which is active worldwide. Amongst other things, it certifies materials, components and systems which are relevant for the safe operation and the quality of ships as well as offshore and industrial systems.

Versatile and efficient: OS.A95 screw compressors

With sustainability being an important topic for many companies, customers are increasingly interested in ammonia as a natural refrigerant. BITZER is meeting this need with the screw compressors in the OS.A95 series for industrial applications and marine refrigeration systems. With their high cooling capacity and automatic Vi adjustment, they are suitable for a wide range of uses. BITZER has optimised both the rotor profiles and the flow cross sections to ensure that OS.A95 models are just as suitable for air-conditioning and for medium temperature applications as they are for the low temperature refrigeration range or for heat pump applications. A key component of the OS.A95 series is the integrated double slider which can be used to efficiently and smoothly adjust the compressor’s cooling capacity and internal volume ratio in a wide range of applications. The capacity control is adjusted with the IQ module integrated into the compressor, in line with the specifications of the superior system controller. Its internal volume ratio is automatically set, depending upon the operating pressures. BITZER’s range of accessories also includes couplings and coupling housings.

Bild: GettyImages/AlexandrBognat
Bild: GettyImages/AlexandrBognat