Water Quality For 40 Bar Compressor Air Cooling Loop

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Water Quality For 40 Bar Compressor Air Cooling Loop

Hi everybody,

We are using brackish raw water for our factory utility cooling media. 

chemical characteristic of water is:

Since the last two year we are using this water, now we see some rust and debris in the pipeline.

Is this water okay for pipeline or not?

Thank you and regards.

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17 Answers

  1. Incomplete analysis and information.  This doesn't make sense.  Hire a water treatment company to handle the problem:  Someone who knows water treatment chemistry. 

  2. Incomplete analysis and information.  This doesn't make sense.  Hire a water treatment company to handle the problem:  Someone who knows water treatment chemistry. 

  3. Carbonate is essential natural corrosion inhibitor for carbon steel in contact with water. Balance between carbonate and calcium will enhance the effectiveness of this inhibition. I suggest from brief data that you have provided, the natural inhibition effect is not sufficient in your system thus will need chemical supplement to reduce corrosion potential. 

     

    The most straight forward way is by adjusting alkalinity and calcium hardness such that water quality to fall into non corrosive zone as per LSI calculation. However, when water temperature is exceeding 35 Celsius this approach will be very challenging since scale and deposition risk start to present. 

     

  4. Carbonate is essential natural corrosion inhibitor for carbon steel in contact with water. Balance between carbonate and calcium will enhance the effectiveness of this inhibition. I suggest from brief data that you have provided, the natural inhibition effect is not sufficient in your system thus will need chemical supplement to reduce corrosion potential. 

     

    The most straight forward way is by adjusting alkalinity and calcium hardness such that water quality to fall into non corrosive zone as per LSI calculation. However, when water temperature is exceeding 35 Celsius this approach will be very challenging since scale and deposition risk start to present. 

     

  5. Hi Navas KT

    Please recheck water Analysis report. 150 mg/l TDS is too low for brackish water. Get complete ionic balance for the water. Reporting results in standard format as equivalent CaCO3, will help in understanding the nature of of water (Corrossive or Scalforming )

    D. Bhatter 

  6. I was quite diplomatic when I asked if you had both chlorine and chloride analysis with "brackish" water.  Your water analysis is not complete indicated by TDS of only 150 for brackish.  What is the condictivity of the water?  How was it tested for TDS.  This is not a complete test result, and does it change over time"?  Calcium at 15, or calcium carbonate at 15.  This makes a big difference.  For a closed loop the pH need to be at 9,5.  What do you mean by cooling media.  The question about tower or a closed loop that only has a 5% water loss per year is significant to the water treatment of the system.  

    As you have presented it: this water is NOT OK for the pipeline, it needs to be treated.  

  7. What's the piping material?

    BR Dieter

  8. Is the cooling loop an open system using open evaporative  cooling or is it a completely closed sealed loop?  The method of treatment is determined based on which type.  The water itself is not hard but is considered soft although there is no indication what the alkalinity of the water is.  I must assume it is also low.

    Answered on by

  9. Dear Mr. Nawas,

    Water of 150 TDS cannot be categorized as brackish water. Please find out Langlier Index. If it is negative then water will be corrosive.  pH, TDS, Calcium & alkalinity & temperature will help you to find out Langlier Index.  If it is negative then you may have to add chemicals to adjust Langlier index to neutral or chemicals to prevent corrosion.  I anticipate that chlorine is added to control microbial growth. Chlorine can also cause corrosion. Please contact me if you need any further assistance. 

     

    Prof. Rajendrakumar V Saraf

  11. You are adding or you have already chlorine, which is corrosive. Also dilluted oxygen is corrosive. We need to know the Chlorides, the Sulfates, the Nitrates concentration and the concentration value of the fresh water in order to estimate how highly corrosive is water in your system. Anyway  it is corrosive and you have to apply protective chemical program. 

  12. Hi Nasvas,
    It is common to see the results you are now getting on your pipes if you are not doing something about treating the minerals in the water.  By no means is your water classified hard, in fact it may be classified as soft water. There is this thought that low mineral content water won't cause problems, well it does. No matter how low the mineral content, over time mineral deposits, more commonly referred to as scale or limescale, will develop not only in the pipe work but also the equipment being cooled.  

    Rather than treating the water once on the way into the cooling system, we have a catalytic water conditioning system that is installed in the recirculating line so each time the water is recircualted it is conditioned.  

    We have a unit for any flow rate and we can customise to  suit your application.

    If you are looking for a solution to your problem then please make contact with me.

  13. You said brackish water.  How much chloride, and how much chlorine do you have?

  14. Dear Navas.

    The best and optimal solution for your problem depends on some characteristics of cooling system.

    The water in study is used in a cooling system:

    1.       Once-Trough?
    2.       With cooling tower?
    3.        Closed?

    Please send me an email with this information to juanj@outlook.com.ar. I can send you some solutions to your problema.

    The best and optimal solution for your problem depends on some characteristics of cooling system.

     

    The water in study is used in a cooling system:

     

    1. Once-Trough?

     

    1. With cooling tower?

     

    1. Closed?

     

    Please send me an email with this information to juanj@outlook.com.ar. I can send you some solutions to your problem.


     

  15. Good Morning Navis,

    Considerations for additional info as follows;

    a)  Is there any source water pretreatment ?

    b)  Rust is indicative of iron.  What is the iron value ?

    c)  The 8.5 pH will cause the calcium and magnesium to scale.  Are you adding anti scaling chemical ?

    d)  You advise chlorine is .5-1ppm.  Are you chemical injecting chlorine, and if so, what type ?

    e)  Normally pH values reported will not cause corrosion.  Do you mean deposition ?

    f)  Outside of noticing the rust etc, what if any are the negative effects ?  

    g)  Periodic blow down / drain / refill may all that is needed.

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  16. Your water is OK for this application but it needs some corrosion inhibitor added proportionately to the makeup.  We treat a factory with vaccume pumps that use water to seal the pumps, these are 100 HP units in banks of 6 in a foundry.  Since we started using the inhibitor the seal failures have dropped to 1/10th of what was previously experienced.  Note that not any inhibitor will do this.  We have formulated closed loop inhibitors for heavy duty industrial use and have them in service for 20 years. Billg@prochemtech.com 

  17. We have an inline device that will cure your dust, corrision and build up.  No outside power needed.