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  1. MechMad1

    Design codes for equipment in a power plant located in the US

    Thanks for your answer racookpe, much helpful!
  2. MechMad1

    Design codes for equipment in a power plant located in the US

    Reading the NB link, I get the picture of Boilers and Pressure Vessels ... For example, in Connecticut, it is mandatory to comply with ASME I and II, but not with ASME VIII. For Turbines, is it mandatory to design these equipment according to US standards? (ASME, API, etc.) I mean, by law, or...
  3. MechMad1

    Design codes for equipment in a power plant located in the US

    General question: If you are building a combined cycle in the United States, the Steam/Gas Turbine & HRSG must be designed according to US standards? Let's say that the owner of the plant is not indicating anything concerning the design codes.
  4. MechMad1

    Double block valve in High Pressure

    I think it is according to ASME B31.1, that when we have a system with high pressure (typically more than 62 bar), we need to use double block valves when connecting the system to atmospheric pressure (e.g., drains and vents). I would like to know in which part of the code this is state, I can...
  5. MechMad1

    How to decide which code use in power plants?

    Thank you for your answers. ijzer, the ASME code seems very interesting. I'll try to get a copy.
  6. MechMad1

    How to decide which code use in power plants?

    I've always thought that a power plant (combined cycle, biomass, solar) will de designed according to ASME B31.1 Now, since in solar thermal power plants they use heat transfer fluids, will it be possible to design according to ASME B31.3? Can a part of the power plant be designed with ASME...
  7. MechMad1

    Outlet static pressure of a Gas Turbine

    All clear now. Thank you all.
  8. MechMad1

    Outlet static pressure of a Gas Turbine

    Yeah, I agree. This data may be referenced for performance. The outlet pressure will be determined by the HRSG downstream the turbine (the losses in the HRSG). But I still don't understand something. The total pressure in the exhaust is the sum of the static and the dynamic pressure. The flow...
  9. MechMad1

    Outlet static pressure of a Gas Turbine

    " This pressure is essentially from the exhaust mass flow impinging at its mean velocity against a surface, not that different than aerodynamic force, and calculated the same way. " But that would be the dynamic pressure, instead of the static pressure, right? BTW, what type of pressure is...
  10. MechMad1

    Outlet static pressure of a Gas Turbine

    I have a manufacturer that states that its turbine has a Outlet static pressure of, let's say, 200 mmH2O. How can I translate this information into the outlet pressure in bars? I get the idea that the static pressure is the pressure of a fluid when it is not moving, like the air inside a car...
  11. MechMad1

    2x100% or 3x50% pumps in power plants

    Yes. I think you have confirmed my thoughts. Thanks!
  12. MechMad1

    2x100% or 3x50% pumps in power plants

    Hi! When deciding which configuration of pumps to use in a power plant (feedwater, condensate, cooling systems, ...), I always have the same doubt, 2x100% or 3x50%. As far as I know, 3x50% configuration are normally more expensive than 2x100%, but allows you to use just one pump if the duty is...
  13. MechMad1

    Sizing Vent Pipe

    Hi, will have a look at the Crane. Thanks. LittleInch, I have a presurized system (40 bar) which is the pipe (8") from a boiler to the steam turbine (ST). The ST end of the pipe is blocked. To warm up this main line, we install a vent to the atmosphere (2"~4"). This vent has just an on/off...
  14. MechMad1

    Sizing Vent Pipe

    Hi all, we have a vent pipe that we use to warm up the main pipe (steam to the turbine). This vent pipe is just a pipe with an isolating valve and it discharges to the atmosphere (we are thinking about getting a silencer). I'm trying to calculate the flow that will be evacuated trough this line...
  15. MechMad1

    Set pressure for relief valve

    Thank you! I found this very interesting. Problem solved!
  16. MechMad1

    Set pressure for relief valve

    I want to fix the set pressure for a relief valve (in a pressure vessel). Let's say that the design pressure of the vessel is 100 barg. As far as I know, it is common practise to fix the set pressure of the relief valve to the design pressure of the equipment (100 barg). But relief valves have a...
  17. MechMad1

    Flanged or welded connection for blowdown vessel

    Thanks MJCronin, that was a very good point. Let's say that from the process point of view, the buttweld is the preferred connection. I agree. Is there other considerations that we should take into account? I'm thinking for example the hidrostatic test, or when having to weld the connection...
  18. MechMad1

    Flanged or welded connection for blowdown vessel

    I have a drains-collecting-manifold that is connected to a flash tank (a blowdown vessel). The fluid is a mixture of steam and water, at aprox. atmospheric pressure. I've seen some vessels that have a welded connection (between vessel and manifold) and others that have a flanged connection. And...
  19. MechMad1

    Design pressure for Blowoff Flash Tank

    Well, I think I've found where this design pressure value comes from. According to API 521 (pressure relieving and depressuring systems), for knockout drums, "a minimum design gauge pressure of 345 kPa (50 psi) is suggested for KO drums in subsonic flare or other low-pressure applications."...
  20. MechMad1

    Design pressure for Blowoff Flash Tank

    Thanks to all of you, I think you've provided some good points. The setup of the design values for the tank and the design of the vent is in my scope of supply, so I will consider a conservative routing for the vent (so in the worst case scenario, there won't be an overpressure in the tank). The...

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