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  1. YungPlantEng

    Calculating cyclic stresses due to temperature differential at mixing point?

    I have a 4” pumped condensate line tying into a 8” valve controlled condensate header with each at different temperatures. I wanted to understand if there were any heuristics or practices that allowed one to state if the cyclic thermal stresses would need to be considered based off the deltaT...
  2. YungPlantEng

    Potential for hydraulic transients with liquid restriction orifice isenthalpic expansion

    Appreciate the guidance guys. This thread can be closed. Process rejected the latter design. Good to know that my assumption was correct that a single throttle valve wouldn’t be feasible with that pressure.
  3. YungPlantEng

    Potential for hydraulic transients with liquid restriction orifice isenthalpic expansion

    Yeah that was my original intention. @katmar Yeah I need to confirm with process if there’s any potential for MDEA+CO2 before I ponder anything else
  4. YungPlantEng

    Potential for hydraulic transients with liquid restriction orifice isenthalpic expansion

    MDEA actually has a really low vapor pressure compared to water - 1 Pa at standard temps. I don’t have a lot of experience with higher pressure liquid systems where flashing is a concern so I can’t speak if that’s actually a high vapor pressure considering this dP. Isn’t it the opposite where...
  5. YungPlantEng

    Impact to frequent load/unload cycles on rotary screw air compressors?

    I am not talking about turning the motor on and off. I am talking about the action of loading & unloading itself (switching of the unload valve at the suction) and whether the frequency of that can contribute to issues like oil carry-over, etc. Gut says yes because I've seen cases where it...
  6. YungPlantEng

    Salt Dosage vs. Capacity relationship

    The original question only came up because the field vendor didn’t understand the difference between adjusting influent hardness vs adjusting salt dosage
  7. YungPlantEng

    Salt Dosage vs. Capacity relationship

    There’s two different systems. In one we are recalculating the time between regeneration by changing the influent hardness set point. That’s what I was asking about. In our main system we are changing the actual salt dosage.
  8. YungPlantEng

    Cost effective methods to prevent significant pressure losses for compressed air from heavy users?

    My site uses regulated compressed air to unload our rail cars to pump maybe around 200 gallons a minute (30 acfm at 40 psig) to storage. During the end of unloads vortex formation allows air to go directly through without the typical downstream pressure of the fluid being unloaded such that the...
  9. YungPlantEng

    Salt Dosage vs. Capacity relationship

    @bimr That still doesn't explain what the salt dosage is. Does it affect the brine draw, etc.? I don't want to change salt dosage. I want the actual influent hardness (20 ppm) to be accurately reflected in the "gallons treated" capacity that determines when the system is regenerated. The...
  10. YungPlantEng

    Salt Dosage vs. Capacity relationship

    So the resin bed is spent the same regardless of the influent concentration? I'll just work through it with the corporate SME engineer... Your answer is very confusing. It also didn't resolve what the salt dosage actually corresponds to. Is it just used for the calculation for the capacity...
  11. YungPlantEng

    Salt Dosage vs. Capacity relationship

    We have a series of smaller softener units that take pre-softened water as an inlet and soften it additionally to make it "super soft". Essentially our bulk softener softens to a maximum of 5 ppm leakage and then these additional polishers are there in case the main softeners failed and went...
  12. YungPlantEng

    Impact to frequent load/unload cycles on rotary screw air compressors?

    1.5 minutes of max flow. I don’t think they’re inadequately sized but since the pressure isn’t reduced from compressor pressure we’re very susceptible to high use periods.
  13. YungPlantEng

    Impact to frequent load/unload cycles on rotary screw air compressors?

    Have two 100 HP rotary screw air compressors that modulate via loading/unloading. Last compressor analysis indicated very frequent load/unload cycles (maybe once a minute per compressor). This is because we don’t regulate pressure after the compressors and various processes use a lot of it...
  14. YungPlantEng

    Selective fluoride or chloride removal from city water stream

    Studies performed on a quenching unit we have indicate fluoride/chloride levels are significant factors in degrading the mortar and brick. Are there any cost-effective industrial methods for fluoride/chloride removal from a stream containing 4 ppm fluorides and other typical fluids found in...
  15. YungPlantEng

    Common use cases for corrosion wax tape?

    I'm re-doing a small natural gas pipeline and wanted to use a typical two-part epoxy for the piping with a corrosion wax tape applied over fittings, welds, valves, and support sections to further reduce the potential of corrosion to those parts. Is this a typical use case for corrosion wax tape...
  16. YungPlantEng

    Differences between mag drive pump manufacturers?

    There are several mag drive pump manufacturers our company uses across several sites (Iwaki, Innomag, Ansimag, Finish Thompson)... Do all these manufacturers provide some sort of niche or are they all just built to the same ASME or ISO standard? What are the primary differences between these...
  17. YungPlantEng

    Quench spray nozzle nose geometry - impact to reliability?

    Why are some spray nozzles designed with the external nose geometry flat vs. chamfered? My assumption was that turbulent eddies that might generate at the leading edge would be less turbulent with a chamfered edge. The application here is vertical hot gas being cooled by spray water coming...
  18. YungPlantEng

    Design Methods for Group Trapping for Steam

    Most manufacturers recommend against group trapping due to backpressuring of the separate legs and potential flooding / hammer. Are there cases where group trapping is either possible or preferred? We have a trace system where there are a large amount of vertical nozzles requiring heat trace...
  19. YungPlantEng

    Coatings for wet and hot corrosion?

    My apologies I thought you were talking about Ultramet. Could we potentially laser clad ultimet to the C276 to avoid a potential catastrophic failure if there were some unforeseen mechanism? Here's another picture of the pretty scaling on the nozzle for your troubles - keep in mind this was...
  20. YungPlantEng

    Coatings for wet and hot corrosion?

    Haha I did. They don’t have experience bonding to C276 so there would likely be some experimentation and there’s no nice way to reduce tensile stresses on a vertically overhung nozzle. Or maybe there are but I’m not a structural/mechE by trade and it’s difficult to convince my company to put...

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