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  1. cavbilly

    VFD alternatives

    OK, you lowered the power requirement, but does this not in some way reduce process efficiency, since you are wasting a large portion of the blower energy input?
  2. cavbilly

    VFD alternatives

    I would like to weight in here, since at least I have some experience with roots blower driving a chemical process (oxidation). 1. We had no VFD at all, and the blower was belt-driven, but as I recall sheave ratio was in the form of a speed up ratio. 2. Out objective was to push as much air as...
  3. cavbilly

    Steam as a representative fluid in API 581- 2016 EDITION

    @Chumpes Yes, if the SI units are employed, then everything is based upon second, meter, kilogram (not gram). Moles are Avogadro's number of atom or molecule, represents that mass in grams, i.e. carbon is exactly 12 g/mole,if all the atoms were 12C. Yes, gram mole is a mole. Yes 1000 moles is...
  4. cavbilly

    Carbon Steel Corrosion from Produced Water

    @springrise I cannot agree more, this is quite corrosive water in its nature, and with this much hardness, trouble is likely.
  5. cavbilly

    Steam as a representative fluid in API 581- 2016 EDITION

    I do not have a copy of API 581 or API 581 RPI(risk protocol inspection?) I am not going to spend $900 to have it. In performing these calculations, one must have familiarity with the units of measure involved. R= 8.31447, refers to the value of the ideal gas constant with units of...
  6. cavbilly

    Carbon Steel Corrosion from Produced Water

    @Chumpes - yes you are correct. Oxygen in that range can and will contribute to corrosion. We are talking about "deep" produced water here, and I suspect it does not meet the definition of de-oxygenated water. With the chemistry of the original poster's water, there had better not be much...
  7. cavbilly

    zero error in rosemount 3051s differential flow transmitter

    A quick search yields ample product support from Emerson-Rosemount. What did they say when you telephoned them? pressure transmitter family Surely you can access a copy of the manual, and look at the "troubleshooting" section. It does sound to me that you have a blockage over the element(s)...
  8. cavbilly

    Material spec. SCM 20??

    You do not have to apologize to me, especially when pointing out such a glaring misquote on my part. I knew better than that! I am the one that is sorry. Thanks for bringing it to my attention, asleep at the wheel once again.
  9. cavbilly

    Material spec. SCM 20??

    Any exemplar of the Japanese made parts to compare with? I would do my best to find out the elemental composition if at all possible, and this might be done non-destructively with a PMI gun (except for carbon steels, these typically will not be able to distinguish). Link There is clearly no...
  10. cavbilly

    how to differentiate between corrosion product on carbon steel is corroded mill scale or just rust

    I believe your first assessment (exposure to seawater, and/or salt air) is the correct one - general corrosion with some pitting may be evident. You accepted this shipment?
  11. cavbilly

    Catastrophic Failure of Stainless Cooking Pot

    It appears to be case closed, based on the reports of high residual stress from deep drawing, and propagated cracks appearing to run parallel to axis, not hoop. SCC will most definitely take place in 316SS when there is high heat stress (as in cooking on a high temperature burner, with little or...
  12. cavbilly

    Al content in Type 431

    If you still have some of the lower Al content stock, work up a part or two (coupons) for fine polish, and also work up a part or two or three of the 0.004% Al current stocks, and polish these up also in precisely the same way, same duration, etc. Put a hickey on each part, or a stamp mark...
  13. cavbilly

    Carbon Steel Corrosion from Produced Water

    I reviewed the analysis you linked to. You state it is a sealed produced water system. Are you certain there is nil oxygen content in the water at the point of origin? I would suggest at least one further test, and that would be ORP. Based on the TDS, species, and the pH, an ORP value for no...
  14. cavbilly

    Steam as a representative fluid in API 581- 2016 EDITION

    Maybe you are not using consistent units of measure between Cp and R. Make sure you have these in the same units, and try again.
  15. cavbilly

    SOUR CRUDE OIL

    Whatever the limits are, with free water and that much sulfur, you can make a safe bet this is sour, and needs treatment to prevent cracking corrosion of the steel.
  16. cavbilly

    Chemical Treatement

    Would not it depend upon what fluid is being pumped or sitting static in said trunk lines? If oil-based, I suspect you would want oil soluble corrosion inhibitor, as water may be forbidden in the line.
  17. cavbilly

    Solar grid tie battery

    I saw a clip yesterday by an MIT professor, and his team that made molten salt magnesium/antimony battery for a grid-scale energy storage, but this is way out of most individual's league at the moment. For short-term 200-800 W power, I would stick with not more than a few lead acid batteries...
  18. cavbilly

    Problem with one HP laptop not compiling Arduino IDE sketches, produces cryptic error messages

    As usual, caveat emptor. I won't make that mistake again.
  19. cavbilly

    Problem with one HP laptop not compiling Arduino IDE sketches, produces cryptic error messages

    Yes, that appears to be the answer. I cannot do that myself, as I am not a computer technician, and have no intentions of becoming one. Taking computers apart, yes, I can take anything apart. It is the putting back together in working order I am concerned about. I have a computer guy here in...
  20. cavbilly

    Problem with one HP laptop not compiling Arduino IDE sketches, produces cryptic error messages

    Yeah, I bought this computer at a really cheap {surprise} price. It was supposedly with one year of 1 TB of "the cloud". The only clouds I know about are (1) the ones angels sit around on, and (2) the ones over my head when it is raining or about to rain. I never could get "on the cloud", and...

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