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  1. dimitris

    BFW degaser operation

    Dear friend, I do not clearly see what you mean by saying that the total heat balance is on the stripping steam side ? Plus why should there be an increase at the degasifier's pressure ? You do not add a fixed amount of steam but as much steam as it is needed to achieve a certain pressure...
  2. dimitris

    BFW degaser operation

    Hi, All chemicals are fed at the exit of the degaser storage tank. Some of them are fed at the suction of the B.F.W pump and some at the discharge, I am sorry for not properly clarifying that at my previous post, Best Regards, Dimitris...
  3. dimitris

    Carbon Monoxide Portable Detectors

    Dear All, In our Hydrogen Production unit we have a UOP Polybed 2 PSA unit. As you all know the purge product contains severe quantities of CO and Hydrogen. (In our case an approximate concentration is 7% CO and 17% Hydrogen). We are currently screening the market for portable CO detectors that...
  4. dimitris

    CORROSION

    Hi, Are you refearing to process condensates or just steam condenstates from your steam production ? Each case needs to be treated differently.. Dimitris..
  5. dimitris

    BFW degaser operation

    Hi, We are using an all organic BFW treatment. We are producing MP steam at a pressure of 45 Kg/cm2 and superheat it at 440 C. The B.F.W includes: -Addition of a three-amine mixture for the PH adjustment of our condensates -Addition of a mixture of organic polymers for scale inhibition and...
  6. dimitris

    Ammonia Piping Purging

    Hi, Normally it is necessary to purge ammonmia piping systems prior to access them. It all depends on the pressure of the system of the overall ammonia hopld up and of the extent of maintenance you will perform. The best way is to isolate the area you want to do work at, properly blind it, and...
  7. dimitris

    Vent Ratio for Deaerator

    Dear jproj You sound a bit tough saying that we forgot our basic chem eng knowledge. Anyway to be absolutely precise you have to add the sensitive heat effect of the superheated steam in the latent one, but usually this is negligble since in most cases the L.P. utility steam is superheated by...
  8. dimitris

    Vent Ratio for Deaerator

    I think that there is a small mistake in your energy balance calculation. T1 should be the temperature of the water leaving the deareator and T2 the water temperature entering the deareator. This amount of steam is the necessary steam for heating the water to its exit temperature (the saturation...
  9. dimitris

    BFW degaser operation

    Please discuss the temperature of BFW inlet at a degaser. In our Ammonia plant we are feeding DW at a temperature of 90 C, in the degaser. The degaser operates at 102-103 C. Please discuss if an increase of the inlet temperature at 93-95 C would cause any problems at the degaser's operation...
  10. dimitris

    Refrigerated Ammonia Piping Inspection

    Does anyone have any experience on inspection methods on refrigerated ammonia piping. We intend to inspect our piping network, but wish to do so without the removal of the insulation and with special care on tee-connections. Anyone has any experience relevant to this issue??? Regards, Dimitris
  11. dimitris

    SB 111-687 ???

    Thank you very much for your prompt response, Best Regards, Dimitris
  12. dimitris

    SB 111-687 ???

    Dear All, Does anyone of you have any idea the type of material and the exact composition of SB 111-687 material. I looked in to the appropriate tables but with little luck, thank you in advance, Dimitris
  13. dimitris

    Ammonia Plant Mothballing

    Dear All, I decided to write the following thread in the refining section even though ammonia is not a Hydrocarbon but because the process used to produce it ressembles so much standard ferining processes, I beleive that it is relevant. I am a head process enginner in an Ammonia Plant that is...
  14. dimitris

    H2 purification Pressure Swing Adsorption

    Hi everybody, To be able to comment on any potential corrosion problems and methods to monitor them we need to know the working conditions of the unit i.e. feed and product composition, waste gas composition, temp and pressure variations on so on. We operate a UOP PSA H2 purification unit, with...
  15. dimitris

    Hydrogen Purification with PSA

    Dear Whylie, I am afraid that I am not aware of the system your are talking about, but one thing that crosses my mind is that this may be a strat up unit only. As you may already know, when you start a reforming hydrogen production unit, to heat up the reformer you pass nnitrogen through it...
  16. dimitris

    Hydrogen Purification with PSA

    Dear Whylie, I am not pretty sure that I got your question right, but I suspect that you are talking about a compressor that recirculates part of the PSA feed stream to the reformer preheating section. Such a system is usually incorporated in hydrogen production units so as to feed hydrogen in...
  17. dimitris

    Filter to absorb CO2 from air for a demin water tank

    The purge is just a hose in the tank that provides a light N2 flow within the tank, flow that is vented from the tanks' vent. there is no pressure control in the tank, the flow is adjusted by checking if there is a light flow coming out from the vent. The only drawback of protecting tanks in...
  18. dimitris

    Filter to absorb CO2 from air for a demin water tank

    i do not have a straight answer to your problem, but just a couple of hints. Why do you want to block CO2 only? Moisture in air will be even more aggresive and you should consider getting rid of it too. The way we protect Demin Water Tanks in our plant is by light purging of an inert (N2), and...
  19. dimitris

    Hydrogen Purification with PSA

    I am a process engineer woring at an Ammonia plant. The necessary H2 for the NH3 production is performed with Catalytic Steam Reforming and the purification of the gas stream is done in a Pressure Swing Adosrption multivessel Unit. Lately the performance of the adsorbers has decreased. We...

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