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  • Users: LaSalle1940
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  1. LaSalle1940

    Estimating mass flow in likely two-phase relief scenario

    I should have pointed out that the liquid in question is an aqueous solution (typical process temperature ~120°F), and that the vessel in question is essentially a large filter, where a manual vent valve will be opened on startup to ensure complete liquid filling. Thus, it seems to me that...
  2. LaSalle1940

    Estimating mass flow in likely two-phase relief scenario

    Let's assume that the heat input to a blocked-in vessel is known (e.g., calculated from a known external area assuming a pool fire). Note that the vessel is completely full of liquid (that is, could essentially be considered as a wide spot in a pipeline). Let's also assume (setting aside any...
  3. LaSalle1940

    Freundlich isotherm data?

    I'm looking for Freundlich isotherm data for granular activated carbon for volatile organics, especially the lighter liquid hydrocarbons(e.g., n-hexane) that one might find in refinery amine solutions prior to regeneration. Can someone please recommend one or more sources of data? I have some...
  4. LaSalle1940

    Freundlich isotherm data?

    I'm looking for Freundlich isotherm data for granular activated carbon for volatile organics, especially the lighter liquid hydrocarbons(e.g., n-hexane) that one might find in refinery amine solutions prior to regeneration. Can someone please recommend one or more sources of data? I have some...
  5. LaSalle1940

    Freundlich isotherm data?

    I'm looking for Freundlich isotherm data for granular activated carbon for volatile organics, especially the lighter liquid hydrocarbons(e.g., n-hexane) that one might find in refinery amine solutions prior to regeneration. Can someone please recommend one or more sources of data? I have some...
  6. LaSalle1940

    Use of Fenske equation in steam stripping?

    Thanks for the assistance. Funny, but I've been unable to locate the Brown-Souder chart in the usual references (Perry; Treybal's Mass Transfer Operations; King's Separation Processes). Have you a reference where I might find it, please? Thanks again.
  7. LaSalle1940

    Steam rates in steam stripping of (lighter) hydrocarbons?

    I believe there is a rule of thumb for the flow of open steam in an application where steam is used to strip off the lighter/lower-boiling hydrocarbons from a multicomponent hydrocarbon mix (e.g., prefractionation prior to desulfurization in a coking plant). However, I can't recall what that...
  8. LaSalle1940

    Use of Fenske equation in steam stripping?

    To do some screening in a very short feasibility study, I was thinking of using the Fenske equation to get a handle on the minimum number of discrete stages in a refining steam stripping operation (specifically, stripping off hydrogen sulfide from an oil stream). Glancing at the equation in any...
  9. LaSalle1940

    Factor for process engineering hours from TIC

    Here's the situation: given a total installed cost, it's pretty well established that for the mythical average project, about 10% of that TIC accounts for engineering. Now, two questions: 1. What fraction of that engineering cost is covered by process (chemical) engineering? 2. Is it a...
  10. LaSalle1940

    Equivalent lengths/K values for pipe crosses

    Most if not all those who post/read here are familiar with the various compilations of equivalent lengths and K values (either the Crane single K, the Hooper two K, or Darby three K method) for evaluation of pressure drop through pipe and fittings. As such, I'm sure that everyone is aware that...
  11. LaSalle1940

    Continuous oil/water interface monitoring--consensus technology

    I'm looking for a consensus/recommendation for technology for monitoring the oil/water interface level in a storage tank (dimensions: ~140 ft diameter x ~50 ft high) that contains mostly water but has a relatively shallow (6" - 18") layer of oil floating on top. Naturally we're talking about a...
  12. LaSalle1940

    Cost for insulating an existing (bare) tank

    Suppose there's a need to insulate an existing API storage tank in, say, a refinery in the northeastern United States. This tank is approximately 125 ft in diameter x 50 ft high, and we're talking about insulation to minimize steam consumption for freeze protection/maintenance of a minimum...
  13. LaSalle1940

    Grounding chain recommendations

    I need guidance/recommendation for specifying a grounding CHAIN (yes, I said "chain", not cable). This would be installed in an atmospheric vessel that will contain molten sulfur. The point is to ensure that the potential between the nozzles where the molten sulfur enters by gravity and the...
  14. LaSalle1940

    Calculating noise level of sonic flow in a pipe

    Hatch, Good suggestion for a starting point: after poking around, I found some graph-based data that allowed a reasonable estimate. At the same time, I also found analytical relations that allow estimation in a spreadsheet. Thanks.
  15. LaSalle1940

    Calculating noise level of sonic flow in a pipe

    I have a situation where there may be sonic flow of (50 psig saturated) steam in a (2") pipe. This would occur rarely, but it would be useful to be able to estimate the noise level at some distance from the pipe. Can someone please provide the appropriate equation(s) and/or point me toward the...
  16. LaSalle1940

    Snuffing steam for sulfur storage tanks

    Interesting note about that plant in Canada: the diameter of the tank in question is essentially the same as the one I'm dealing with. Would it be possible to find out the identity of that plant so that I can pick their brains a bit? Note to Jim Casey: my comment about a 12" line was based on...
  17. LaSalle1940

    Multi-phase condensate/steam line sizing

    I'd suggest looking at www.spiraxsarco.com for on-line sizing tools; the situation described originally approximates flow of condensate to a trap (the valve at the inlet of the low-pressure tank is roughly analogous to the trap). One thing with which I'd agree: you want to minimize the amount...
  18. LaSalle1940

    Snuffing steam for sulfur storage tanks

    This question involves ongoing practices with respect to supplying snuffing steam to sulfur storage tanks. According to NFPA 655 (2001), if used, snuffing steam should be provided at a rate of 8 lb/min per 100 ft³ of EMPTY tank volume. For a tank measuring 30 ft OD x 16 ft high, that amounts...
  19. LaSalle1940

    Friction factor correlation/dimensionless quantity?

    Many thanks again, UmeshMathur. I've already checked with Khanna concerning the purchase price of the text, and I've inquired (but haven't received an answer yet) about shipping to the U.S.; we'll see. And I'm confident I can get Streeter and Wylie's text in the interim from one of the nearby...
  20. LaSalle1940

    Friction factor correlation/dimensionless quantity?

    Thank you, UmeshMathur: you're right that this text must be a very well-kept secret. I did a search on Amazon and found nothing; likewise, a search of the library holdings at Rutgers turned up nothing. I assume it wasn't published in either the U.S. or the U.K., so it's probably escaped...

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