vibration phenomenon in synthesis comp. in ammonia plant

UreaKnowHow – where urea industry meets Forums Ammonia Mechanical & Maintenance vibration phenomenon in synthesis comp. in ammonia plant

Viewing 15 posts - 1 through 15 (of 20 total)
  • Author
    Posts
  • #98378
    nimesh7
    Participant
      • Participant

      Dear friend,
      Check the viscosity of oil.if it is not according to design, then oil wheerling happen at high rpm…….second thing…..check temperature of oil console, if it remains high, it also promote vibration

      #98375
      mehdimojaziamiri
      Participant
        • Participant

        dear salam
        we had one same experience in KHPC by KHI compressor at 1997 and running that compressor for 6 months at Hi vibration ( around 90 um)
        after checking all process point finally by MHI maintenance group ( KHI was manufacture of my compressor ) solve our problem and after that we saw normal condition on machine therefore
        i think you have not any process abnormality and suggest you checking again by mechanical team
        thanks

        #98222
        Mark Brouwer
        Keymaster
          • Expert

          Dear majad

          we will repair the first rotor in a workshop outside Iraq. Earlier we replaced the four impellers in the second rotor and then appeared to increase in the total weight of the second rotor about 3 kg(total weigth of first rotor 337kg, total weight of second rotor 340kg). Please Is this difference in weight causes a vibration?

          Beas regards
          Salam

          #98220
          majidjan
          Participant
            • Participant

            Hi

            Did you find the problem?

            Best Regards
            Majid

            #98204
            Mark Brouwer
            Keymaster
              • Expert

              Dear all, dear jafarvand

              We running compressor today and occurs the vibration in speed 9000 rpm in free side only (62M) but at last time the vibration was occurs in free side and coupling side. ? I talk with head of rotary in our plant about clearances in pads and he told me that we have simple deviation in clearances of pads and he told me that we at last time(before 3years) running the compressor wiht the same deviation in clearances without vibration. and he told me if the simple deviation in clearances in pads cause the vibration why the vibration become now in free side only.?

              Best regards
              Salam

              #98196
              Mark Brouwer
              Keymaster
                • Expert

                Dear Mr. Mark

                Thanks for your attention.

                Best regards
                Salam

                #98195
                Mark Brouwer
                Keymaster
                  • Expert

                  Please find enclosed a Technical Paper, which may be of help.

                  #98194
                  Mark Brouwer
                  Keymaster
                    • Expert

                    Dear jafavand

                    1-the bearings condition and clearances is good .(2nd rotor also old)

                    2- the compressor manufactures by Dressor company and model 1985.

                    3-the vabrition occurs after done overhaul on L.P.case and turbine only. We did not done any overhual for H.P.case.

                    4-the vibration is increase slowly.

                    best regards
                    Salam

                    #98193
                    jafarvand
                    Participant
                      • Participant

                      Dear Salam,
                      What about the bearing condition and clearances? As you said that even by changing the rotors, you have the same problem, the problem could from bearings.
                      Also, can you tell us the compressor manufacturer and model. This could give good information as manufacturer’s model give information about rotor arrangement.
                      I also need to know have you done any overhaul on this compressor recently or not. If yes, what did you do during the turn around? If no, can you tell us if this increase in vibration happened suddenly, or slowly reached the alarm level?

                      Yours
                      F.Jafarvand

                      #98192
                      Mark Brouwer
                      Keymaster
                        • Expert

                        Dear my friend

                        We now work again dynamics balance for rotor ( three times) as a result of the balance is 0.15 gram while at last time was it 0.5 grams noted that the allowable range is acceptable 0.6 grams We believe that with this change, we can reach a speed of 10,000 rpm with less vibration. We will start running for compressor tomorrow.

                        Best regards
                        Salam

                        #98190
                        Mark Brouwer
                        Keymaster
                          • Expert

                          Dear my friend

                          I am sorry for the delay, we have Oil seal system and conditions of this system is good and we replacement the rotor (old also) and we face same broplem but the vibration become occur in speed (9400rpm)more than first rotor.

                          Best regards
                          Salam

                          #98189
                          majidjan
                          Participant
                            • Participant

                            Dear My Friend

                            i did not get your final reply.but

                            I got that you say,vibration is increased continously from Min.Governer up to 9000 rpm without any affect on turbine.So,my opinion is that ,it is impossible to have mechanical problem on the train.
                            At first ,I propose that you change the ROTOR and start the compressor again

                            Best Regards

                            #98181
                            Mark Brouwer
                            Keymaster
                              • Expert

                              Dear nassem

                              The compressor and turbine old runing.

                              Best regards

                              #98180
                              Mark Brouwer
                              Keymaster
                                • Expert

                                Dear,

                                is the compressor and turbine are new or old running . if old is this happen after the turn around. can you share what is done and provide explanation.

                                #98175
                                Mark Brouwer
                                Keymaster
                                  • Expert

                                  Dear my friend

                                  Thanks for your attention

                                  6-we open the demister and check it.
                                  7- we done visual check only.
                                  10- we done visual check only.
                                  12- yes,i sure from instrument devices is correct.
                                  13-We did not check the vibration by portable probes.
                                  14- i will send my answer tomorrow.

                                  Best regards
                                  Salam

                                Viewing 15 posts - 1 through 15 (of 20 total)
                                • You must be logged in to reply to this topic.
                                UreaKnowHow

                                UreaKnowHow.com is an independent group of nitrogen fertilizer specialists with an impressive number of years experience in designing, maintaining and operating nitrogen fertilizer plants.

                                Solution Providers offer their solutions to improve our member’s plants performance.