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  1. chemengbr

    Regeneration of adsorbent beds

    Amar, That’s a hard questions for us to answer (IMHO). Could you regen at a different frequency then design? Yes, I’d say so. If proper sampling and monitoring you can probably create some type of totalizer calc or watch performance and have that trigger your regens. Will that save you cost? My...
  2. chemengbr

    API 520 D.2.2 (Sub-cooled liquid)

    Thanks apetri, I'll look into some of the other methods. As it turns out the source of difference in my omegas was due to user error (shame on me). In chemcad I was using a flash unit op with two outlet streams one vapor and one liquid. I was then combining the streams in excel to get my...
  3. chemengbr

    API 520 D.2.2 (Sub-cooled liquid)

    While creating an automated spreadsheet to perform sub-cooled PSV sizing,I noticed that per API 520, equation D.9 can be used for all cases highlighted in section D.2.2 (multi-component systems with nominal boiling range less than 150°F or single-component systems far from the critical point...
  4. chemengbr

    Gas Critical Flow Across Orifice

    Ok, so here is my current understanding of this matter. Thin plate orifices do not experience choked flow. As shown by Cunningham 1951, and many others, mass flow rate across the orifice continues to increase with decreasing downstream pressure. This occurs because the vena contracta is not...
  5. chemengbr

    Gas Critical Flow Across Orifice

    Latexman, hacksaw,and others that have posted, thanks for all your help. I think I just need to sit down for a few hours now and digest all the information and resources provided, as well as organize my thoughts. Later in the weekend or early next week, I'll come back and try to summarize my...
  6. chemengbr

    Gas Critical Flow Across Orifice

    hacksaw, do you have any literature recommendation regarding the relationship between t/d and discharge coefficient? So far, I’ve only skimmed through the Ward-Smith article above, which seem to indicate the following. sharp edge, t/d= 0, Cd = 1.0 thin plate (0<t/d<1)Cd varies from 1 to 0.81 as...
  7. chemengbr

    Gas Critical Flow Across Orifice

    Wow, there is a lot more nuance to this matter than I thought at first. It is almost a bit overwhelming, here is what I've learned and will do next. 1)I reviewed Dennis Kirk technical paper that Latexman recommended and it is impressive the amount of work that Dennis put into it. Looks like he...
  8. chemengbr

    Gas Critical Flow Across Orifice

    Thanks for all the replies and resources. I'll try to review tonight and tomorrow the documents and links posted and will return afterwards. Latexman, at first I also thought that one equation could turn into the other, but that is not the case here. I tried to work the algebra out, but did not...
  9. chemengbr

    Gas Critical Flow Across Orifice

    Had some time between meetings today, and cracked Perry's open one more time to read it a bit more closely. Here is what I found. "For the case of critical flow through a square- or sharp-edged concentric circular orifice (where r ≤ rc, as discussed earlier in this subsection), use Eqs...
  10. chemengbr

    Gas Critical Flow Across Orifice

    Last post only attached the sheet formula. So here is the one from Perry's.https://files.engineering.com/getfile.aspx?folder=8904975a-cf8f-4c65-893d-bac54fe863f1&file=Perry's_Eqn_10-31.jpg
  11. chemengbr

    Gas Critical Flow Across Orifice

    Latexman, thanks for the article, and like you said not sure if it helped me or confused me more. The article seems to argue against the existence of a maximum flow caused by critical conditions,but unfortunately I am still a bit confused on how to take that and translate into a reliable mass...
  12. chemengbr

    Gas Critical Flow Across Orifice

    I have been working on finding steam flow across an orifice, as this flow will dictate the relief requirements for a relief valve down stream of the orifice. Therefore, I decided to create my own excel calculator to be very detailed, so that future engineers can see how I arrived at my numbers...

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