The revamp of turbocompressors using same new ideas of the compressor stage design

The examples of ammonia and hydrogen chloride compressors revamps are presented. Some new concepts using a special method of grooving the surface of the compressor stage have been introduced in. The significant improvement of polytropic efficiency of stages and consequently isothermal efficiency increase of the compressors of 7 - 8 % were reached. Also another features of the performance desired by clients were achieved by mentioned revamp: increasing of the capacity up to 20 -38 % and advantageous flat compressor performance character. The compressors are more then one year in satisfactory operation. Some interesting observations as dirty gas service and its influence on the nitrogen chloride compressor behaviour are also described.