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  1. Nicolas13

    accumulator with an isolation bladder api 614 centrifugal compressor

    Thanks for your reply: The pressure instruments are new, two are installed with the same measures, one for each seal. The seal are liquid film type with cylindrical bushing. No inert gas is used.Contaminated oil is evacuated from the oil system thru oil drainers. If you refer to API614 figure...
  2. Nicolas13

    accumulator with an isolation bladder api 614 centrifugal compressor

    For an old process centrifugal compressor equiped with an isolation bladder inside the accumulator (API614 Figure 2A-14; 50 liter), the oil pressure does not correspond to the height of the liquid (4.5m). About 150mb is missing. The bladder is causing this anomaly; the existing bladder material...
  3. Nicolas13

    What action required if N2 supply failure in Dry Gas Secondary seal ?

    is the chamber between the seals connected to a flare line with a non return valve? If this chamber may stay pressurized during the N2 source failure, then you can run for some mn. The operatin time after N2 failure depends of the material, design of the seals, the actual worn out, fouling. One...
  4. Nicolas13

    Dry Gas Seal Cleaning

    What do you want to clean, the seal faces (internal or external) to avoid/reduce the process gas leakage? No chance by flushing wih N2.
  5. Nicolas13

    Trip & Throttle Valve Overhaul Frequency

    yes , you can increase it to 6 or 7 years, this depends on the reliability and RCA of past failure.
  6. Nicolas13

    Sundyne Pump Impeller and Indecer damage

    It could be also a too low flow with inlet recirculation
  7. Nicolas13

    Sundyne Pump Impeller and Indecer damage

    problem of cavitation, NPSHa is too low
  8. Nicolas13

    Turbine Blade broken

    in reaction turbine when a small blade fails the rotor vibration could stay at low value without noticeable event.
  9. Nicolas13

    steam turbine: intermittent vibration - coked oil seal

    Thank you Walt I knew all of them (except miataturbo). Nicolas
  10. Nicolas13

    steam turbine: intermittent vibration - coked oil seal

    in my case the brg housing and oil deflector are hot due to steam leakage. 1. What I'd like to understand is the difference of vibration rub pattern between rotor rubbing on steel strip (light rub on steam laby supported by springs) and coked oil deflector which is normally a soft pad. 2. I...
  11. Nicolas13

    steam turbine: intermittent vibration - coked oil seal

    byrdj: you're right, I will try to inject air (not easy but feasible) and protect the oil deflector with a shield.
  12. Nicolas13

    steam turbine: intermittent vibration - coked oil seal

    Sorry but it does exist, I already met this phenomenon in machines( hot gas expander, steam turbine) and others people also (GE, Bently Nevada). Cleaning would be in service, ok for spray temp, too costly to shut down the plant for this light rub that is why we imagine this scenario. thank for...
  13. Nicolas13

    steam turbine: intermittent vibration - coked oil seal

    A 4400 rpm high temperature steam turbine vibrates intermittently. The fouling/coking of the oil labyrinth is suspected as origin. If this is the case and after confirmation, it is possible to clean the deflector with the turbine in normal operation by means of a special high-pressure cleaner...
  14. Nicolas13

    Centrifugal compressor with 95% H2S

    Plant is in Europe
  15. Nicolas13

    Centrifugal compressor with 95% H2S

    This gas is already compressed by several reciprocating compressors. For reliability reasons plus the increase of capacity the question of new compressor type is raised. About the axial type, the suction volume (7000Nm3/h) is too low. Thanks for comments.
  16. Nicolas13

    Centrifugal compressor with 95% H2S

    Gas does not contain water, I agree to consider this possibility, CO2 less than 0.1%, H2 less than 1%, all concentrations are % weight.
  17. Nicolas13

    Centrifugal compressor with 95% H2S

    Would you use an axially or radially CC or integrally geared compressor containing 95% H2S and light hydrocarbons? Pressures barg in/out: 2 / 12. Power less than 1Mw. Dry gas seals. What would be your basic requirements?

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