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  1. 22854

    Preparation of SO4H2 pipe for maintenance and commissioning

    ash9144 I am not used to abreviations or acronysms. Could you please tell me what do you mean when referring to PPE ? Than you very much for your help.
  2. 22854

    Preparation of SO4H2 pipe for maintenance and commissioning

    I have a rupture in 98% sulfuric acid line (carbon steel) and have to prepare it for repair and put it in service again. Which are the recommended procedures for cleaning the line before giving it to maintenance and the ones before introducing the product to avoid presence of moisture, etc.
  3. 22854

    Recovery of Cooling Water Tower blowdown

    I am very interested to know of different alternatives to for the recovery and reutilization of cooling water tower blowdown, instead of sending it as wastewater.- For any of the alternatives it will be of great help to know which are the processes required to treat this water for the proposed use.
  4. 22854

    low and high pH in demineralized water for BFW

    Which are the problems associated to deminearlized water used as BFW (to produce HHP steam = 110 bar) with pH below 6.5 or above 7.5 ? Which are the main reasons to maintain it in the range 6.5 < pH < 7.5 ?
  5. 22854

    How to eliminate Sulfates from waste water effluents

    Dear Friends, Thank you all for your help and assesment. Regarding the limits of 100 ppm of sulfates going to the sea, by the time I asked my first question we sent a reclamation to the authorities to study and reestablish new limits for this and other parameteres of contaminants in the...
  6. 22854

    Compressor type for CO2

    I'm interested to know opinions on which compressor type (alternative , centrifugal, ecc.) is mostly used or reccomended from different points of view (operational, maintenance, initial cost, ec.) nowadays.- Service is to compress low pressure (0,5/0,6 bar g) gaseous CO2 coming from MEA or MDEA...
  7. 22854

    CO2 Compressor type

    I'm interested to know opinions on which compressor type (alternative , centrifugal, ecc.) is mostly used or reccomended from different points of view (operational, maintenance, initial cost, ec.) nowadays.- Service is to compress low pressure (0,5/0,6 bar g) gaseous CO2 coming from MEA or MDEA...
  8. 22854

    How to eliminate Sulfates from waste water effluents

    Thanks to all for this ample discussion. We studied the option to use HCL to regenerate IX resins but it is not a good option from the economical point of view and have also to change materials and increase storage capacities three times. The use of RO means that we will still have sulfates...
  9. 22854

    How to eliminate Sulfates from waste water effluents

    In fact the municipal regulation is related to the discharge to the sea. We have a limit of 100 mg/lt.- In general, individual effluents have the following concentrations: Neutralization basin from demin water plant: 4900 mg/lt discontinuous. NH3 system cooling water blowdown 825 mg/lt...
  10. 22854

    How to eliminate Sulfates from waste water effluents

    I would like to know which are the most used methods o technologies to eliminate or reduce sulfates contents from industrial waste water to comply with municipal regulations. Main quantities of sulfates come from neutralizing basin of demin water plant and cooling water tower blow down.
  11. 22854

    How to eliminate Sulfates from waste water

    I would like to know which are the most used methods o technologies to eliminate or reduce sulfates contents from industrial waste water to comply with municipal regulations. Main quantities of sulfates come from neutralizing basin of demin water plant and cooling water tower blow down.
  12. 22854

    CO2 production from boiler combustion gases

    I work for an Ammonia & Urea producing plant. We are interested to increase our actual capacity of the urea plant. We have an excess of NH3 but need an extra amount of CO2 (in the order of 22 Ton/hr maximum) We are thinking to install a boiler (Natural gas fired to get CO2 from combustion...
  13. 22854

    CO2 production &amp; sulfur compounds treatment

    I work for an Ammonia & Urea producing plant. We are interested to increase our actual capacity of the urea plant. We have an excess of NH3 but need an extra amount of CO2 (in the order of 22 Ton/hr) We are thinking to install a boiler (Natural gas fired, Off-gas optionally) to get CO2 from...
  14. 22854

    Ammonia Stripping

    Thank you very much Spekuljak I will read your paper. Any other source for designing the facilities or Engineering Vendors ?
  15. 22854

    Ammonia Stripping

    I work in a NH3 and urea producing plant. We a a very important quantity of effluent water that is normally contaminated with ammonia and carbamate that exceeds the ammonia regulations for the effluent of the plant. We do not have any effluent treatment plant. We only have several ponds to...
  16. 22854

    internal rubber membrane for storage tank

    I am studying different alternatives to avoid the entrance of air in the tank when pumping out. I've been noticed to use internal rubber membranes (like a balloon)inside the tank, that receives the liquid and it does not have contact with the air. Does anyone have experience with this. I need...
  17. 22854

    How to avoid CO2 entering Deionized water tank

    Thank you for your comments. Regarding the N2 &quot;loose&quot; I tried to mean that we simply put a N2 hose into the top of the tank to mainain a N2 atmosphere without controlling the amount of N2 that was vented out from the tank. With sodium carbonate I meant a filter with a bed of solid...
  18. 22854

    How to avoid CO2 entering Deionized water tank

    We have an atmospheric API storage tank, venting to atmosphere that receives deionized water and goes from it to mixed beds. It has no protection against CO2 entering the tank with the air during pump out. Which options do we have to avoid it ? 1) We tried N2 blanketing but don't want to loose...
  19. 22854

    HCl vs SO4H2 for demin water plant regeneration

    Thanks to those who have answered my questions, but I have another one. Actually we are regenerating the cation in two steps. First with Sulfuric Acid 1,5% and the other one with sulfuric acid at 3% concentration (This is to avoid CaSO4 precipitation). And, we are regenerating de mixed beds...
  20. 22854

    HCl vs SO4H2 for demin water plant regeneration

    1)I would like to know advantages and disadvantages of using HCl or SO4H2 for the regeneration in a demineralization water plant. 2) How can I make an economical evaluation from the point of view of chemicals consumption ? 3) Is it possible to use our actual SO4H2, Carbon Steel tank to store...

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