Performance Assessment (Thermodynamic)

Field Evaluation of Compressors, Pumps
Wood provides operation assessments on : compressors, engines and turbines, pumps, and other rotating equipment .
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1 Performance Assessment of Reciprocating Compressors and Engines

For maximum dependability of reciprocating compressor packages, equipment owners implement periodic performance and condition assessments ( for the compressor and engine ). typically, the performance analysis involves a one day locate visit with extra time for set-up, travel, and post-processing of data. A portable analyzer is used to collect performance data, including the pressure-volume card data from compressors and engines .

1.1 Scope
  • The equipment owner will provide information about the unit (to set-up our analyzer and investigation).
  • The operator or mechanic will install valves on compressor cylinders prior to the visit.
  • Wood will capture mechanical and performance data during the site visit. Wood will compare the actual operating results with the theoretical performance model for early indication of problems and will include these performance and condition indicators:
    • Power and load, capacity
    • Efficiency
    • Leaking valves and rings
    • Improper valve dynamics
    • Crosshead and rod knocks
    • Power cylinder combustion
    • Vibration of accessories and frame
  • Wood will prepare a detailed performance report for the unit, providing a valuable baseline for future assessments.
operation analysis on offshore reciprocate compressor Beta Field Analyst using B-Probe. Fast inspection identifies condition of bearings, wrist pin, and inner condition .
1.2 Option: Engine Bearing Assessment
  • This is a non-invasive method to assess the wear on internal bearing and components and avoid expensive (and often unnecessary) engine overhauls.
  • Operators can avoid excessive maintenance costs and potential crashes by checking:
    • Wrist pin and rod bearing clearances (wear and trend)
    • Cylinder leakage rates
    • Power cylinder condition & wear: liners, rings, ports, head, valves
    • Valve sink and train setting
    • Cylinder condition rating
  • The internal inspection requires only a short shutdown (typically, four hours) to collect this valuable data. This is a fraction of the cost of an overhaul.
  • The assessment uses Wood’s patented B-Probe (sold under license by Windrock and called the E-ProbeTM engine inspection tool).


here are some exercise savings :

  • Created savings of >$3 million for a US gas transmission company by postponing overhauls of seven units
  • Prevented failures that would have resulted in >$1 million damage
  • Identified significant performance improvement opportunities due to valve dynamics problems resulting in incremental production exceeding $millions/year
  • Allowing more targeted engine overhauls resulted in 80% cost reduction
  • Extended the period between overhauls and identified overhaul requirements based on the unit’s condition
1.4 Examples

performance Monitoring Examples : read more

2 Performance Assessment of Turbines/Centrifugal Compressors

Wood conducts performance analyses for other rotating assets, namely centrifugal compressors and gasoline turbine trains. Site testing and performance mold techniques are used to determine key dependability criteria, including :

  • Compressor head flow and efficiency
  • Gas turbine air mass flow and firing temperatures, including  T5 spread and deviation
  • Performance deviations over time

model : A gasoline field was projected to be depleted within 18 months and the equipment owner wanted to avoid substitute or overhaul of the gas turbine. Wood conducted a detail performance and vibration appraisal of the complete accelerator turbine and centrifugal compressor system. The accelerator turbine was in acceptable form to last the compulsory clock time vitamin a long as it was regularly washed. The analysis did point out that the power turbine was in poor determine and that the compressor system needed booster compression to avoid tide. As a consequence, the node conducted an renovation of the ability turbine and installed extra compression for the remainder of the sphere ’ second production life .
More examples : Centrifugal Compressor Performance ( pdf )


Wood Advantages

  • Dedicated team of field analysts and engineers with performance and dynamic analysis experience offers combination of troubleshooting and performance analysis – a  valuable advantage for many projects and sets Wood apart from route-based vibration technicians
  • Independent advice (vendor neutral)
  • Technology leaders and inventors of Recip-Trap™ engine and compressor analyzer still remain at Wood. This experience is utilized in our field and performance monitoring groups.
  • Integrated service of coordinated performance inspections with pulsation/vibration assessments is only offered by Wood.
Centrifugal performance testing & assessment in the Middle East
4 Related Information
5 Key Words
  • Recip-Trap Analysis
  • Compressor Performance Inspection

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