Typical process steps for centrifugal compressors modernization:

• Examination and determination of new operating conditions
• Test run of the compressor before modernization
• Analysis of the existing construction of the compressor
• Calculation of compressor performance before modernization
• Calculation of the expected compressor performance after modernization
• Specification of the construction limits for the project
• Preliminary project of modernization.Quotation,with specification of new components and modification of existing ones. Qualification of mechanical and technological warranty.
• Negotiation of the final modernization contract including material selection and choice of the impeller manufacturing technology(e.g. welding, brazing, riveting, casting).
• Final project of modernization and testing calculations:
  • aerodynamic
  • stress resistance
  • rotor dynamic
• Project execution.Supervision and inspection. Certification of individual technological operations.
• Shipping. Assembly supervision. Start up. Mechanical testing and vibration measurements.
• Site performance test and recalculation to the guaranteed conditions.
• Warranty and after-market service.
  

Typical performance curves

Advantages of the modernization (revamp) process:

• Low cost (40-60%), as compared with the cost of the manufacturer's new rotor, but the same guarantee.
• Compressor capability increase (efficiency, presure ratio, flow) due to improvement of flow path components.
• Short period necessary for execution and application of the project.
• In most cases, modernization process does not interrupt production. Necessary measurements and final assembly of the components are done during scheduled repairs and standstills.
• Foundation and piping changes are not required.
• The possibility to apply modern control systems.
• All arrangements are made directly between Supplier and End-user (without any third party involved) which provides maximum satisfaction of End-user and reduces costs.

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