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  • Users: engy74
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  1. engy74

    supersonic flux across a DN 32 valve

    thanks, latexman. As I have to verify the max gas flow in case of accident (release valve DN that suddenly opens with the gas compressor before the valve at full load) I need to understand wich is the worst case: so probably C= 1 (???) may be the most conservative value for calculating the flow...
  2. engy74

    supersonic flux across a DN 32 valve

    PS: I have to thank quark: the we paged linked is very usefull, and mentions all the information necessary for my calculation. The only doubts is about the discharge coefficient, which is arbitrarly placed equal to 0.72 What is it??? REgards, Engy 74
  3. engy74

    supersonic flux across a DN 32 valve

    uhm... dear sirs, I thank YOu for the explanations suggested, but I disagree with YOu. First: the DN 32 valve permit to vent a line with an operating pressure of 24/25 bar-g: so the ratio between internal and outside pressure is more than the critical ratio = sonic bloc inside the pipe!!!! The...
  4. engy74

    supersonic flux across a DN 32 valve

    I have a natural gas pipe line, operating pressure 25 bar-a, operating temperature 60°C, fluid natural gas with density 0.8 kg/Nm3. On this line I have a vent line to the atmosphere with a ball valve DN 32. Let's suppose this DN 32 valve remains open; in this situation the main pipe line is...
  5. engy74

    motor heat exchangers

    hello Try to place two manometers, one on the inlet flange, the other on the outlet flange, air side. Verify with the heat exchanger data sheet the pressure drop of the component, as indicated by the supplier. then, if the pressure drop are higher than declared, your heat ex. has to be clean. If...
  6. engy74

    How to raise condenser vacuum?

    Hi everyone; I submit You other doubts reguarding this condenser 1) temperature of the water at the inlet of the condenser: are we sure that the design temperature corresponds to the real inlet temperature? 2) pressure and temperature of the steam before the turbine: are these parameters the...
  7. engy74

    How to raise condenser vacuum?

    dear Semarang, from the indication given above, one may suggest that your condenser is under sized with respects to its turbine, i.e. it can not extract all the heat by the condensation of the steam: but this seems very strange; another thing I suggest YOu to verify consist of the temperature...
  8. engy74

    make up to steam cycle

    Dear Zehnder, I 'm not sure to have understood the trouble, so I need more details. First how can your turbine operate in both backpressure and condensing mode? Second: why do you avoid to feed the make up water to the deaerator tank? Third: which kind of plant (cogeneration, thermal power...
  9. engy74

    psychrometric charts

    correct, QUark I have downloaded the program (very interesting, but non in SI units!) I try to click but nothing happens... If for You it's easier than for me You can send it to my mail: viaggiatore74@hotmail.com Thank You again and best regards. Engy 74 PS: what about the possibility to use SI...
  10. engy74

    psychrometric charts

    Thank You,Quark. I have download from the site You have kindly indicated: but the chart uses other units than SI, and it seems impossible to change the defalut units in SI units; I don't understand if the conversion possibility is part of the full operating edition of the chart, or if it's only...
  11. engy74

    psychrometric charts

    to TD2k: I have seen on nautcadehumid, but for my opinin the chart has not a good quality, in particular when You try to print it! Thanks ,ENgy74
  12. engy74

    psychrometric charts

    where can I find, on Internet, a good - easy to read and print . and freeware edition of the psychrometric chart in the SI? Thanks everybody!
  13. engy74

    ISO 2314:ôGas turbines: acceptance testsö

    Thanks everyone,but it's impossible for me(and I don't know why) to download the file...if You can, You can send it at viaggiatore74@hotmail.com.Best regards, Engy 74
  14. engy74

    ISO 2314:ôGas turbines: acceptance testsö

    Thank You very much,TestEngineer. Your reply was one of the most interesting and complete I have received... now I'd like to understand if there is a norm which indicates the quality of instruments and therefore their accuracy...so I will be able to indicate a value (maximum, for istance) with...
  15. engy74

    ISO 2314:ôGas turbines: acceptance testsö

    Thank You very much,PM over...with reference to reference conditions for the performances of the GTs, I don't have troubles: average ambient temperature, site altitude, pressure losses at inlet / outlet, and so on are parameters well known and well defined; so this isn't a problem (and I have...
  16. engy74

    ISO 2314:ôGas turbines: acceptance testsö

    Thank You,TD2K,but the actual situazion is this (with more details)I'm in the proposal phase, so there isn't a contract between my Company and the GT supplier: I have in my hand only the documents produced by my GT supplier, in which are indicated the tolerances on the values of natural gas...
  17. engy74

    ISO 2314:ôGas turbines: acceptance testsö

    I have to define the performances of a gas turbine fed by natural gas for a new plant. I need then to define the tolerances of the guaranteed values (electrical power and gas consumption) and of the instruments to use to measure these values. Could you indicate me, please, which is the norm that...
  18. engy74

    Hello! I have to define the perf

    Gas Turbines Acceptance Tests I have forgotten to indicate the topics of my question... Bye
  19. engy74

    Hello! I have to define the perf

    Hello! I have to define the performances of a gas turbine fed by natural gas for a new plant. I need then to define the tolerances of the guaranteed values (electrical power and gas consumption) and of the instruments to use to measure these values. Could you indicate me, please, which is the...
  20. engy74

    Water quality for fire tubes boilers

    Thanks again to all the engineers have helped me to resolve this problem...fortunately my Customer has decided to install the deaerator (choose with I agree, after all) and then, if he will place the order to my COmpany, a new deaerator will placed in the plant..

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