Condensation Corrosion in HP section of urea plant

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  • #101976
    Mark Brouwer
    Keymaster
      • Expert
      quote Majid Khan” post_id=9439 time=1582047812 user_id=6804:

      Dear All,

      There is already a paper on the subject topic. I would request for further discussion.
      Anyone who has experienced condensation corrosion especially in technology patented by Snam? e.g we have ammonia stripping process and stripper top vapor line is operated at 189’C and 147 kg/cm2 pressure. What pressure of steam tracing would be adequate? There are certain flanges at our site which are without insulation. what would be the impact of it?

      The temp of the gas line should be higher than the condensation temp of the gas to avoid condensation corrosion. 9 bar steam is likely ok but 4 bar steam (145 degC) will cause a cooling effect and increase condensation and condensation corrosion.
      In gas lines it is goof practice to insulate the flange connections while creating a leak detection hole in order to detect any possible flange leak.
      Did you face any leakages / condensation corrosion ?

      #101975
      Mark Brouwer
      Keymaster
        • Expert
        quote HADIAN post_id=9969 time=1611602363 user_id=3581:

        Hi dear friend
        is there any standard for number start or stop urea unit?
        many start & stop urea unit cause more stress in liner.
        thanks

        More stops and starts influence the lifetime of the liner as cracks can occur.
        We are not aware of a specific numbers
        The number where cracks will occur depends on several factors such as cooling down and heating up rates, distance of liner to carbon steel wall, quality of applied material, etc.
        Did you experience any cracks ?
        Best measure is to apply the AMMO LASER Leak Detection System, refer to the link below

        #101974
        hadian
        Participant
          • Participant

          Hi dear friend
          is there any standard for number start or stop urea unit?
          many start & stop urea unit cause more stress in liner.
          thanks

          #101695
          norozi1972
          Participant
            • Expert

            Dear Friend
            It depends to the steam pressure levels.I think 9barg steam preasure is perfect for eliminate the
            carbamate condensation corrosion.
            Best regard
            Norozi
            Persian ureaammonia.ir web site founder

            #101687
            tarek2000
            Participant
              • Participant

              greetings

              i Think the common reasons for Condensation corrosion in H.P equipment are Bad insulation and /or
              Steam tracing failure. Therefore during every Turnaround H.P equipment must be checked externally and internally.

              Hope this would help

              Best regards

              Mohamed Tarek

              #93926
              majid-khan
              Participant
                • Participant

                Dear All,

                There is already a paper on the subject topic. I would request for further discussion.
                Anyone who has experienced condensation corrosion especially in technology patented by Snam? e.g we have ammonia stripping process and stripper top vapor line is operated at 189’C and 147 kg/cm2 pressure. What pressure of steam tracing would be adequate? There are certain flanges at our site which are without insulation. what would be the impact of it?

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