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Recent content by arbainmahmood

  1. arbainmahmood

    Vibration of Centrifugal Compressor

    Dear Bae, From which vib that tripped your machine - radial vib probe at which brg (x & y-), or axial displacement (z-) or casing vib when ramping-up flowrate? What is the min flow? and this min flow should be called min flow to surge. Compr shud always run above min flow to avoid surging (to...
  2. arbainmahmood

    expander - compressor failure

    Yes, it was partly loaded, when operator was manually loading unit C, unit-D was then switched to 'Auto' mode. No record as at what pressure or temp when it went up overspeed.
  3. arbainmahmood

    expander - compressor failure

    Hello, anybody out there has any experience in expander - compressor failure? Ours is Rotoflow, 4 stage expander - compressor configuration, H2 service in ethylene plant. In July 2008 we experienced a catastrophic failure in Unit-A, both expander & compressor wheel broken into pieces. Normal...
  4. arbainmahmood

    Air compressor problem

    Dear all, 1. We (Ethylene plant) have 3 unit of MHI compressors (centrifugal)designed each at 3100nm3/hr & 8.6 barg disch pressure, 2 unit are motor driven & 1 steam turbine manufactured by Shin Nippon. 2. When the plant was commissioned in ~1995 not much of air demand only 1 compr is...

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