vibration phenomenon in synthesis comp. in ammonia plant

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  • #98174
    majidjan
    Participant
      • Participant

      Dear My Friend

      Thank you.

      6. Did you check the demister internally yourself?please take a sample to sure about this.
      7.Did you do foundation test or has been done visual check?
      10.Did you check the forces on springs based on specifications or it has been done visually?
      12.Are you sure about correct performance of instrument devices?
      13.Have you checked the vibrations by portable probes or not to sure correspondence data with instruments?
      14.Are sure about good performance of dry gas seals?How?

      After that we sure about above mentioned items we will discuss in detail

      best Regards
      Majid

      #98173
      Mark Brouwer
      Keymaster
        • Expert

        Dear Majid

        thanks for your attention

        1-compressor driver is turbine.
        2- extraction type.
        3-the turbine located between LP and HP.
        4-the compressor with out gear.
        5-speed of compressor is 11000rpm ,suction pressure is23bar,discharge pressure is 145 bar.
        6-yes, there is K.O drum and it is good.
        7-the foundation is good.
        8-yes,there is recycle gas line,
        9-
        10- the recycle gas line is good supproting
        11-the vibration in M.G.S is more than normal.

        Best regards
        Salam

        #98172
        majidjan
        Participant
          • Participant

          Dear My friend

          Thank you for sharing the problem.let me know tha:

          1. Is Compressor driver turbine or electrical motor?
          2.What is the type of the turbine,If your driver is turbine?
          3.HP case and LP case are located in one side of turbine or each one is located in one side and turbine is between them?
          4.please confirm that there is no gear box.
          5. What are compressor speed in 100% capacity,suction and discharge pressure?
          6. Do you have K.O drum between LP and HP case?and Are you sure about good performance of the drum demisters to avoid escaping the water droplets to HP case?
          7. Have you checked compressor foundations?
          8.Do the recycle gas is return to HP case or not?
          9.Ammonia product separator is located up stream or down stream of ammonia convertor?because performance of such separator can affect the recycle gas to HP case.
          10.Are you sure about recycle gas line good supprotings without any damage?
          11.Do the vibrations are more than normal when you reach to Min. Governer too?

          My friend,there are many reasons for such vibration.please let me know more information maybe I can help you.

          best Regards
          Majid

          #98169
          Mark Brouwer
          Keymaster
            • Expert

            dear all friends

            No body have any actual experience about vibration.?

            Best regards
            Salam

            #92961
            Mark Brouwer
            Keymaster
              • Expert

              Dear all

              We face vibration phenomenon in synthesis gases compressor in ammonia plant .the vibration occure in(H.P.case for compressor) ( free side and coupling side)(vertical and horizontal).the vibration increase gradually with increase the speed and during increase the speed to 9000rpm the vibration become it 50 micron(alarm) and after increase the speed to 10000 rpm the vibration become it 67micron(trip).

              Please note the following:
              1- we open H.p. case for compressor three times and we checking all internal parts and we did not any problem.
              2-we done dynamics balance for rotor tow times.
              3-we checking the alignment three times and we did not any problem.
              4- the vibration in the L.p.case and turbine was normal.
              5-specifications gases were normal.

              Please anyone have experience can you help us.

              Best regards
              Salam

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