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  • Users: MechMad1
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  1. 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.
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. MechMad1

    Design pressure for Blowoff Flash Tank

    Hi! I've got to define the design pressure of a vessel which receives the intermitent blowdown from a boiler. It is an atmospheric tank, so the normal pressure would be aprox. 1,2 bara (1 + pressure losses in the vent). I would like to know if there is a code or just good practice that states...
  10. MechMad1

    HEI Fouling resistance in Heat Exchangers

    Hi! Just trying to define the fouling resistance for a tube/shell heat exchangers. I'm following "HEI Standards for closed feedwater heaters", para. 2.2.2. As I understand, I should consider 0.0002 units in the inside tubes (for all the zones) and 0.0003 units in the outside tubes (only...

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