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  1. springrise

    What is the most rare damage mechanism?

    I've come across an idea of thermogalvanic corrosion cell (i.e. same material but different temperatures causing corrosion) which I consider to be rare - at least as a main cause of damage. Anyhow, this is not even mentioned in the API 571.
  2. springrise

    Heat exchangers U-tube - Tube failure

    This looks like a "fish mouth failure" which is often attributed to the local overheating of the pipe. However, there are other possible reasons that might have caused this type of damage, e.g. local thinning due to erosion-corrosion and subsequent ripping of the pipe.
  3. springrise

    Determining of soluble gases in water

    You don't need to detect soluble methane, you need to detect there's a methane in your cooling water (as gas phase). For this you either make your cooling tower gas detection system functional asap or you go hunting for the methane with portable gas detector - start with cooling water...
  4. springrise

    Refinery Corrosion / Inspection engineer's Certificate

    hi, maybe the courses provided by NACE International.
  5. springrise

    BFW Contamination with HC material

    Hi, I think there are several mechanisms how the oily contamination could lower the pH. I assume you use NaOH to adjust the pH. Maybe there was an interaction of NaOH with organics - emulgation. Maybe the organics fouled the pH probe that controls the dosing. Organics negatively affecting the...
  6. springrise

    Rusting Issue on Stainless Steel 316L Light

    TDS = total dissolved solids in water, measured in a lab as mg/liter, conductivity measurement is related and equally helpful information
  7. springrise

    lime calcium chloride blend

    hi, is that a solid powder or a water solution? If a solution, you haven't specified the concentrations.
  8. springrise

    I have two big tanks of NaOH and H2

    hi, by partition you mean a partition of the secondary containment basin so that the tanks are not placed in the same containment volume?
  9. springrise

    Chemical Availability Calculation

    measure level decrease in the feed container.. if the level decrease is large enough to be confidently measured..
  10. springrise

    Adding phosphate to Boiler feed water pump inlet to control Ph of the water

    Hi, phosphate isn't meant to be used for pH control, it's supposed to react with residues of water hardness. Instead, sodium hydroxide is used to control pH. Check pH of your feedwater, as well as pH of the steam generator blowdown. Concentrated chemicals should be preferrably injected to a tank...
  11. springrise

    Service Water of Cooling Tower

    Would this be the only source of water for the cooling system? Or is there another feed water source, that is "clean"? What ratio? I assume you have a recirculating cooling system, because you mentioned cooling towers. As for the references, the "underdeposit corrosion" is a common corrosion...
  12. springrise

    Service Water of Cooling Tower

    Hi, do you have idea what would be the resulting concentrations of Cu and As in the cooling water circuit? Is the copper and arsenic present mainly in particulate/dissolved form? If it's particulate you should be able to filter them out. Possible problems in the cooling circuit: - (if...
  13. springrise

    Passing sludge through vertical precipitator

    thank you, what are the dimensions of the precipitators - diameter and height?
  14. springrise

    Passing sludge through vertical precipitator

    can't open the attachment.. can you please try again? maybe change the name of the picture file.
  15. springrise

    Passing sludge through vertical precipitator

    Hi, I guess you are talking about vertical sedimentation tank where you bring the sludge-water mixture to the bottom (by perforated tubes) and the clean water is supposed to overflow at the top (through an overflow weir maybe?). Sludge is supposed to stay at the bottom and it's drawn off in...
  16. springrise

    Sulphates remouval problem

    What is the source of alkalinity in your wastewater (pH up to 13.5 ..)? Is the hydrosulfite the only source of sulfur in your wastewater? How do you adjust pH of the wastewater? Getting below 370 mg/L is tough, lime won't do it neither, because calcium sulfate solubility is still rather high...
  17. springrise

    Minimal loading to a WWTP

    Problem with a too low loading is not that the bacteria die (as long as it's aerated) but rather that filamentous bacteria start to grow, possibly causing problems with sludge sedimentation. Also, while volumetric loading is useful design parameter you could take a closer look on F/M loading...
  18. springrise

    Carbon Steel Corrosion from Produced Water

    Hello James, based on the analysis this is wastewater not produced water (could be e.g. brine from softener regeneration, reverse osmosis concentrate, etc.). The water has 200 German degrees of hardness! Given the huge salinity, low pH (note 7,3 IS corrosive for carbon steel) I would suggest...
  19. springrise

    moving to corrosion job

    Thank you for your time and advice, I'll do as you say.
  20. springrise

    moving to corrosion job

    Dear experts, I'm about to move to a corrosion engineer position in refinery/petrochemical plant in 2 months. My background is in water-wastewater area with some experience with corrosion in cooling and steam circuits. I feel very much attracted to the new job. I'd like to ask you for help in...

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