Stopping of Ammonia Boost up Pump

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  • #96251
    manzoor-elahi
    Participant
      • Participant

      dear akbar i think we can apply this without any problem if we modify the logic as sometimes the ammonia pump from storage may cavitate so we have to use low pressure switch at the suction of ammonia feed pump for the auto start of ammonia booster pump to avoid any damage to pump

      #96227
      akbar-ali
      Participant
        • Participant

        Dear PKS,

        Thanks for understanding the Case Study.
        Yes there will be a Auto Start Switch logic on Booster Pump that will operate at low pressure(set Point) of A-125-J discharge, as mentioned in first Post.

        I just worry about the response time of Auto Start Switch and Booster pump operation in any emergency/abnormality with A-125-J, while the suction and discharge V/V of Booster pump will open and Ammonia Receiver will be under nitrogen pressure with constant level.

        Regards
        Akbar Ali

        #96225
        Mark Brouwer
        Keymaster
          • Expert

          Dear Akabar Ali,
          What I could understand that your process received ammonia in ammonia surge drum from where through booster pump you supplied ammonia to H.P ammonia pump.
          In this case your modification seems ok, but check how you sustain your plant if some problem comes in hot ammonia pump A-125J.
          more detail information will help to giive some more input.
          thanks
          Prabhat

          #96224
          akbar-ali
          Participant
            • Participant

            Dear Imran and PKS,

            Thanks you for your inputs.
            Our plant was based on TEC Process Technology and no recovered ammonia comes back to Ammonia Receiver, more over a provision of ammonia branch of 1.5″ from Discharge line of Boost up Pump is available for HP Absorber to control N/C.

            Thanks
            Akbar Ali

            #96215
            Mark Brouwer
            Keymaster
              • Expert

              Dear Akabar ali.
              I am agree with Imran point. In SNAM process the excess ammonia is recovered through MP section via MP absorber and stored in ammonia receiver tank. There is input of fresh ammonia coming from ammonia plant in ammonia receiver tank. That fresh ammonia helps to absorbe maximum ammonia and remaining inerts will go to atmosphere through inert washing tower.
              Now the same question Where do you store the recovered ammonia ?
              If you share your actual needs for this modification, it will help to understand your problem and possibly some alternate solution can be proposed.

              Regards
              Prabhat

              #96209
              imran-idris
              Participant
                • Participant

                I have some queries regarding your working
                1- Where would you send the recovered Ammonia (Ammonia recovered through MP Absorber)?
                2- From Where would you feed Reflux Ammonia to MP absorber to avoid CO2 carryover from MP absorber?

                Ammonia received from Ammonia backend is equivalent to fresh makeup required to maintain level in Ammonia reservoir at Urea plant, but Ammonia going to HP Ammonia pump is the sum of recovered Ammonia from MP Absorber and fresh Ammonia makeup. Usually the ratio of fresh Ammonia & Feed Ammonia to Reactor is around 0.7. So even with directing fresh Ammonia to HP Ammonia pump suction you’ll have to pump 30% of Ammonia through booster pump.
                Moreover as fresh Ammonia is relatively at lower temperatures, it helps in reducing Ammonia losses from MP vent.

                Regards,
                Imran.Idris
                https://forums.thepetrostreet.com/

                #92556
                akbar-ali
                Participant
                  • Participant

                  Dear All,

                  Generally in Snamp and TEC Urea Process Technologies, Urea Plant has its own ammonia receiving/storage facility from where Ammonia Boost up pump take suction and direct the discharge to suction of Ammonia Feed Pump via pulsation dampener in P.D pump Case.

                  My question is,
                  If the distance between A-125-J (hot product ammonia pump at ammonia plant) and Ammonia Feed Pump at Urea Plant is short and discharge pressure of 125-J reaches at suction of ammonia feed pump is same as booster pump, can we stop Ammonia Boost up pump by putting a control scheme on booster pump and keeping Storage/receiver in streamline with constant level and under nitrogen pressure.

                  We have developed this scheme on paper and looking for implementation.
                  We just want to get a reference; if anyone has implemented this scheme please share experience and HAZOP related point.

                  Thanks in advance.

                  Best Regards

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