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  • Users: spereira
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  1. spereira

    pressure reducing devices

    hi guys, thks for the suggestions. 121202, you've understand it correctly, the problem is that such an high head would make level control impractical (my guess is that it would become some kind of on/off control) so whatever flow rate is needed we need to reduce the "old" pump head since the...
  2. spereira

    pressure reducing devices

    Hi, I have a question regarding liquid line pressure reducing devices: we have 3 condensate pumps running, discharging at 8.5 bar for two paralel circuits, one at 8 bar (lowest flowrate) and the other at 1.5 bar (highest flowrate). In order to optmize energy consumtion we're planning on changing...
  3. spereira

    sequential turbo setup

    Hi guys, I have a question regarding turbo setups: Suppose I'd need 3bar for a 1.5lt diesel engine at 5300rpm. This gives me around 28lb/m. I've checked compressor maps of the GT series and none is able to give 3bar discharge pressure for such a low mass flowrate...either regarding...
  4. spereira

    improving intercooler efficiency

    Hi guys, MRNEL, nice info on that link, thks :-) mister2, I was told some rally cars use the AC to help cooling down the IC core. I think it would work best on a air-to-air IC than on a air-to water IC since in the last case you'd be using the AC to cool the circulating cooling medium and not...
  5. spereira

    S'charger Intercooler Cooling

    Hi Finman, I'm not in the automotive business, though I would like to ;-)! I work in a chemical plant. Part of my job is to design process heat transfer equipment, mostly shell and tube HE, nevertheless, the same HT principles applies to charge air intercooling. Anyway, I'm interested in this...
  6. spereira

    S'charger Intercooler Cooling

    Hi Finman, As for your first question, I’ve seen logs from TDi engines where intake air temperatures drops to 50ºC…this with an air-to air IC. As for your second question, I’m not sure what you mean by it but with a closed system and a small rad you can bring the cooling medium to a temperature...
  7. spereira

    S'charger Intercooler Cooling

    hi again ;) I don't think you can use the engine jacket water as a cooling medium for the after cooler since its normal temperature is around 90ºC and there's no way you can cool down the compreesed air temperature to a temperature lower than this i.e intake temperature would always be higher...
  8. spereira

    improving intercooler efficiency

    hi Mrnel, I think that you're going to see some change in the HT efficiency by radiusing the core tubes. the problem is that by doing this you're changing core geometry and thus the heat transfer correlations on which its design was based are no longer valid. heat transfer coefficients, hence...
  9. spereira

    Supercharger Inter / After cooler

    hi Finman, you can use the adiabatic compression equation for ideal gases to have an idea of the temperatures after air compression: Tdicharge=Tinletx(Pdischarge/Pinlet)^.283 where .283 is a constant for air (other gases have different constants since it's a function of its heat capacities)...
  10. spereira

    Activated carbon plant design

    hi, what kind of info are you looking for? normally, activated carbon plants are designed based on experimental data as well as the activated carbon selection for a specific application. activated carbon specifications are useful for selecting the most adequate activated carbon for a given...
  11. spereira

    Energy absorbed by evaporation

    ...LPG mass flow times its latent heat of vaporization. The stoichiometric AF ration is 14.7 by weight. combining the two: m.Cpair(Tin-Tout)=m/14.7*latent heat so the eq. becomes: Cpair[J/kg.ºC]*(Tin-Tout)[ºC]=latent heat[J/kg]/14.7 Assuming Tin=120ºC, by solving this eq. you'll have...
  12. spereira

    Steam Question

    Hi JoeChem, I have the same problem in our plant. we use direct steam for heating process water. sometimes they become yellowish. I've also spoken to the people responsible for our water/condensate treatment and they say that it is possible that contact with iron can lead to this. I've measured...
  13. spereira

    steam piping arrangement

    MJCronin I really don't have a lot of experience with steam systems. So far all we've done was tieing-in the header line to supply low pressure steam to new plants more or less by duplicating existing steam lines with the same flow/pressure drop. But now, the expected steam usage forces us to...
  14. spereira

    hi can anyone tell me if there a

    "Mention is made that the tank containment is quite large! Please reveiw NFPA. You might get a break if you combine more than one tank into a common containment area. Instead of having 110% of capacity of each tank, one only needs 110% of the larger of two or more tanks" Hookem, I...
  15. spereira

    steam piping arrangement

    thks TD2K the flow is either way. what do you call a drip leg? I thought I only needed to consider steam traps. As for the connections I was planning on using reducing 'T' instead of tapping the header pipe. And, as for the number of expansion loops, they were designed by the engineering...
  16. spereira

    steam piping arrangement

    hi, fot the revamping of one of our plants we need to increase low pressure steam (1.5 bar) pipe size in order to allow for increased steam production. Actual pipe size is 16" and I've calculated a new pipe size of 20". The question is: I might not have the space on the existing pipe...
  17. spereira

    Need for EGR?

    Chumley, Very interesting the link you've posted, thks. It also explains a lot of other ECU functions! After reading about the closed loop cycle of the O2 sensor I understand why an engine wouldn't need an EGR system but I guess catalysts for diesel and gasoline engines would work in different...
  18. spereira

    Need for EGR?

    I don't think the ECU can control NOx emissions just by the O2 sensor which I believe changes the AF ratio. The EGR is able to reduce NOx emission because it reduces combustion temperature thus reducing N2 oxidation to NOx (I guess this could be achieved by increasing the amount of excess air...
  19. spereira

    hi can anyone tell me if there a

    MJCronin, thks for pointing out other points to keep in mind. I'm used to design process equipment, not storage vessels so I'm still learning and studying all alternatives. I knew that it should be field erected but haven't considered the other costs that you've mentioned like premium painting...
  20. spereira

    hi can anyone tell me if there a

    Montemayor, I beleive you!I've also reached the 19m diameter number (math is the same everywhere ;-)) and had a feeling that construction costs would be much higher (in the past we had spherical vessels for ammonia high pressure storage and that's when I learned that this shape gives us the...

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