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  1. poetix99

    Cyclic discharge of pressure relief valve

    Thank you, respondents, particularly LittleInch, for your comments. The suggestion that I am "normalizing a safety event" got my attention, for which I thank you. The safety valve is indeed sized for a different event which has not (yet) occurred. Although the trip events, with much less vented...
  2. poetix99

    Cyclic discharge of pressure relief valve

    I have a Pressure Safety Relief Valve (PSRV) in a steam line supplying some in-house test equipment. The PSRV is intended to protect the test equipment from over-pressurization. Nominal crack/full-open pressures are 330/365 psig. During occasional trip-outs (unplanned, sudden shutdown of the...
  3. poetix99

    Maximizing Boiler Efficiency regard to steam injection method

    You are essentially proposing to convert a (mostly) open system to a (mostly) closed system. The potential efficiency increase is from the reduction of energy that is needed to heat the make-up water to the temperature of the feedwater, or the condensate return temperature (see my questions...
  4. poetix99

    Maximum Flashing Rate from a Control Valve

    Regarding your question about "guidelines on the percentage [that can be flashed]"... It is possible that a [throttling] valve not designed for flashing could be damaged by cavitation. You should consult with a valve vendor to know what valve trim is best suited to this application, and delta-P...
  5. poetix99

    Radial Inflow Expander

    A radial inflow expander is a turbine. It extracts energy from the working fluid (gas), and supplies power to a rotating shaft. In this type of machine, the flow of the gas is (mostly) radial, and (mostly) inward from a large radius to a smaller radius, and generally exits the expander in a...
  6. poetix99

    Turbine Steam Usage problem

    I see that you got your question "sorted out", but only FredRosse gave you information that implicitly answered one of your original questions: BHP (in this context) stands for Brake HorsePower. The "brake" here refers to shaft power delivered at the driven equipment. The quantity such as 85...
  7. poetix99

    Wilson Zone affects on turbine performance

    I think that "inthevalley" has offered some useful, general comments. I don't think that any of his comments relate in any particular way to "operation in the Wilson Zone". Condensation of supersaturated steam is a non-equilibrium phenomenon; not well (or easily) understood, but not...
  8. poetix99

    Technical German?

    Thanks to EGT01 for what seems to be a rather good site for translation. I notice that the site might migrate to elsewhere, but it shouldn't be difficult to follow... Other sites that I have used are good, but general-use. It is necessary to "verify" translations with reverse-translation, and...
  9. poetix99

    Velocity of compressed air inside pipe

    [It is generally a good idea to start a new thread for a new question, even when it is the same, or similar, subject. Not to scold; it is just that you'll more likely get better response.] Notwithstanding the procedural advice: Your pressure distribution and flow rates will be different with...
  10. poetix99

    Wet steam/saturated steam Turbines

    This thread is becoming old, and, in fact, JohanOlsson will figure certain things out for himself. Nonetheless, I'd like to say that although redundancy might be a nice thing, this is all about making money - whether we might like to admit that or not. From that perspective it is virtually...
  11. poetix99

    How does sonic flows maintain a steady flow rate if it does?

    This little tempest in a teapot is amusing - for a few posts, anyway. "mbeychok": If one increases the upstream pressure, one has changed the conditions of the flow "problem" under consideration. Of course the mass flow can be increased if the upstream pressure is increased, you are...
  12. poetix99

    Free jet decay

    It is not clear to me why you would "hestitate to use the available models ... because of the large dimensions (of this particular item)". In fact, with relatively large dimensions, you will have a relatively high Reynolds number, and the notion of a "core" velocity should be most accurate. If...
  13. poetix99

    Deposits in HP Turbine

    It is common for a turbine rotor to have some residual magnetism. For example, API Standard 612 (not applicable to your rotor, but cited as a convenient standard for comparison) requires that the residual magnetism of rotating elements is not to exceed 3 gauss (0.0003 tesla). There might be...
  14. poetix99

    Steam Turbine Problem

    You would do very well to get some basic background on: Steam Turbines Combined Cycle systems Power Plant engineering Closed cooling water systems You, as the user, specify the exhaust pressure of the steam turbine. However, this is not arbitrary; it depends upon what heat sink is available...
  15. poetix99

    open loop question

    Friar Tuck appears to have made an accurate calculation of 11.5 C° temperature rise for a well-mixed tank. There are MANY other factors that ought to be considered: What is the temperature of the 2E6 BTU/hr heat source? How, for that matter, are you sure that the heat input is 2E6 BTU/hr...
  16. poetix99

    Wet steam/saturated steam Turbines

    I agree, for the most part, with the discussion so far. There is no fundamental difference in what a steam turbine with (dry) saturated inlet steam would look like compared to one designed for superheated steam. Some details might be different, particularly so as to direct some of the...
  17. poetix99

    Huge steam losses in the summer

    Even though your current question is obviously related to the question which started this thread, please do consider starting a new thread: * Others with particular knowledge related to the new question might more easily notice a new posting. * It will also be easily for others to find the new...
  18. poetix99

    1000 F mixture of air and superheated steam

    The water content of flue gas at ~1000°F(?!!) is superheated steam at a partial pressure corresponding to the mole fraction of H20 in the mixture. It is not in the liquid phase. It is not supercritical; the pressure is too low. As "EdStainless" said: use NIST, or some similar website for pure...
  19. poetix99

    How does sonic flows maintain a steady flow rate if it does?

    You've asked several questions at once, which you probably realized. Your respondents have not directly answered your question about sonic/supersonic flow in pipes; they have refered to flow through nozzles (converging, or converg/diverg). Flow in pipes cannot be supersonic. Flow in pipes is...
  20. poetix99

    Huge steam losses in the summer

    If the steam flow rate is reduced from 220 to 90, the "residence time" of the steam in the piping has increased by a factor of ~(22/9) = 2.4 Even though the heat transfer coefficient at the steam-pipe interface will be somewhat less at reduced velocities, the h.t. rate will not diminish as fast...

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