Siemens manufactures world’s largest geared compressor rotor for Jazan IGCC

Photo courtesy of Siemens.

Siemens has manufactured and tested the largest geared compressor rotor in the world at its facility in Duisburg, Germany. The first-stage impeller with a diameter of 1.8 m is the largest installed on an integrally geared compressor rotor.

The STC-GV compressor rotor is part of an order placed last year by UK-based Air Products PLC. The order comprises 19 STC-GV integrally geared compressors for the air separation unit of the Jazan integrated gasification combined cycle power plant (IGCC) in Saudi Arabia. The first compressor units have been successfully tested at the Siemens Mega Test Center in Duisburg. These compressors are now on their way to the site for commissioning and erection due to start in mid-2018.

The air separation facility will supply 75 Mtpd of oxygen and nitrogen (20 Mt oxygen and 55 Mt nitrogen) to a facility currently under construction in the Jazan province on the coast of the Red Sea. The air separation plant, part of what will be the world's largest industrial gas complex, will be operated by Jazan Gas Projects Company, a joint venture between the local company ACWA Holding and Air Products, an industrial gases company headquartered in the US. Siemens will supply seven model STC-GV main air compressors, six STC-GV booster air compressors and six model STC-GV nitrogen. The nitrogen compressor power is significantly higher than normally seen on high pressure integrally geared compressors. 

Each of the rotors that will be assembled inside the STC-GV compressors weighs more than seven tons. This impeller was balanced in Duisburg at a speed of 3,970 rpm. At its average operating speed, the outside diameter of the first-stage impeller rotates at a speed of 1,350 km/h, faster than most jet aircraft. 

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