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  • Users: anubis512
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  1. anubis512

    ASHRAE 15 Chiller PRV Capacity

    I'm working on a chiller installation project. Our client has detailed pressure relief valve records, so we've asked the chiller vendor for their relief valve calculations. They gave some very basic info and deferred to the ASHRAE 15, Section 9.7.5 Equation: C = f*D*L Where: C = Capacity (#/min...
  2. anubis512

    Choked Flow Critical Area Question

    Hi All, I'm a pretty new engineer a couple years out of college. The topic of choked flow keeps coming up at my job so I've bought a couple compressible flow books and am attempting to educate myself. Currently browsing through Compressible Fluid Flow by Saad (if you have any other...
  3. anubis512

    Shell & Tube HE - Tubes under External Pressure

    Hi, I'm working on a project where the shell side is rated 350/-15 psig while the tube side is rated 200/-15 psig. In my mind, the tubes could theoretically experience 350 psig external pressure, which is not what it's rated for. I can't seem to find very much literature on a HE where the shell...
  4. anubis512

    Latent Heat of Vaporization Equation

    Hi All, I'm trying to calculate the latent heat of vaporization of a chemical using the equation found in Perry's Chemical Handbook, Table 2-150. It gives the latent heat equation and chemical specific constants. My issue is I can't get that equation, which outputs J/kmol, to convert correctly...
  5. anubis512

    Amount of Vacuum Created from Condensing Vapor

    Hi, I'm attempting to calculate the amount of vacuum generated on a distillation column to determine if a vacuum relief device is required. Currently I'm examining two cases - 1) the condenser operating at full load while the reboiler is shut off & 2) a cold top feed collapsing the rising...
  6. anubis512

    Help Finding an Article

    Hi all, I'm going through relief valve calculations. In numerous forums/articles I've seen this article referenced, but I can't find it. Does anyone have a copy or know where I could find it? Wing Y. Wong - "Fires, Vessels and the Pressure Relief Valve", May 2000, pages 84-92 Thanks!
  7. anubis512

    API 521 Vapor Discharge Capacity Equation

    Hi all, I'm in the process of sizing relief valves and I have a question about the equation for vapor discharge capacity (W) found in API RP 521. We have an old copy on file (1990) and the equation for vapor discharge (A-7) is a little complicated. Looking through our Consolidated book, Crosby...
  8. anubis512

    PSV Model with sonic flow

    I've been giving a model of PSV, it's connection sizes, orifice size, flow rate, and set pressure. I'm attempting to model the discharge piping in AFT Arrow. This particular PSV has a 3" outlet and is rated for 18,780 lb/hr of steam with a set pressure of 205psig. When it's run with just 3"...

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