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  1. abeltio

    Liquid fuel pump type

    Carbon steel pump is ok for fuel forwarding skid, it is what GE uses for it. Dual fuel 9FA with DLN 2.0 and Mark VI... there are very few of those mostly in Middle East. We can help you. saludos. a.
  2. abeltio

    GE 9FA fast unload on shutdown

    There is only a handful of 9FAs with DLN 2.0 left, with Mark VI even fewer.u I've heard about this fast unload but never actually experienced it. Do you have any high-speed data capture during shutdown to identify how the fast unload kicks in? If GE Product Service recommended adjusting...
  3. abeltio

    gas turbines

    In industrial type gas turbines: The typical nomenclature is "turbine rotor spool" when the buckets are not installed, when the buckets are installed it is referred to as "turbine rotor". The compressor rotor is always referred to as "Compressor rotor" Compressor rotor + Turbine rotor (with...
  4. abeltio

    steam turbine

    The start-up sequence for a stand-alone ST is not the same as for a ST in a single-shaft combined cycle (SSCC). And in a SSCC it is also different if there is, or not, a clutch to disengage the ST And it also varies from model to model and from manufacturer to manufacturer, depending on the...
  5. abeltio

    governors -Please help!

    To avoid a single point failure, i.e. redundancy. saludos. a.
  6. abeltio

    Single shaft and two shaft gas turbines

    @rotaryw, No, don't think it is an over-statement... the original post is asking for the difference between single and two shaft gas turbines. The quote from GE is perfectly clear: QUOTE The LM2500 is derived from the CF6 family of aircraft engines used on a variety of commercial aircraft and...
  7. abeltio

    Seal weld and single or double groove on Type shell & tubes heat exchangers

    See TEMA Stds. Latest rev. and follow guidelines to determine application. TEMA Stds are copyrighted so copies cannot be posted saludos. a.
  8. abeltio

    Switching Fuel

    Because of the lack of data I guess: heat up to above 80°C and a lot of steam or not so much depending on initial temperatures. Is this student homework? saludos. a.
  9. abeltio

    Single shaft and two shaft gas turbines

    The nomenclature applies to industrial type gas turbines and not to aeroderivatives Single shaft gas turbine: compressor rotor is bolted to power turbine, used mostly for power generation. NOTE: the gearbox is a reductor from 5105 rpm (typical speed for a GE frame 5 unit) to 3000 rpm (50 Hz) or...
  10. abeltio

    grooving on tube sheet for expansion

    I think we are missing a sketch but, in refinery service (TEMA R) there are typically three grooves for tube expansion: two near tube side face of the tubesheet and a third one near the shell side face of the tubesheet. TEMA specifies that for a design pressure over 2 MPa and/or a temperature...
  11. abeltio

    Hydraulic diameter of finned tube

    p = pitch saludos. a.
  12. abeltio

    How to clean liquid fuel nozzle lines for 7ea gas turbine.

    Dual fuel units are known for having this problem. Is this a DLN unit or Std. Combustor? recommendations differ The only way to clean the lines is: Disassembly Thorough cleaning with steam or another product that will dislodge the coke lumps Inspection with borescope where possible. Otherwise...
  13. abeltio

    Taming a Thermal Expansion Relief Valve

    The thermal expansion relief valves are very small The liquid service relief valves are bigger and certified by the National Board and rated in U.S. gallons per minute of 60°F [16°C] water flow at 110% of its setting I would make sure that the valve installed is the "liquid service relief...
  14. abeltio

    Taming a Thermal Expansion Relief Valve

    From the description: could it be that the application is not "thermal expansion relief valve"? For steam at 1000 psig the Saturated Steam Temperature is 546.43 °F So, the tube side will never get to steam phase (will always stay liquid) The "thermal expansion relief valves" are designed for a...
  15. abeltio

    Trying to better understand Thermal Fluid BTU Loss to Calculate GPM Requirements

    Process Heat Transfer by Donald Q. Kern has very practical equations for batch processes. Using steady state equations, as mentioned already, will not provide the right solution. It is also important to know if the fluid will be agitated or not, the heat transfer coefficient and the equations...
  16. abeltio

    Which code to use for a Cosmetics Plant?

    For Europe, you need to also consider now de PED (Pressure Equipment Directive) and ATEx requirements. saludos. a.
  17. abeltio

    Desuperheating necessary/senseful

    Ah, ok! A reboiler boiling out the water ammonia mixture is a different application (not a regular heat exchanger) where there is a free surface of liquid. The original post mentioned a "heat exchanger", I was thinking BEU, instead of a "reboiler" like an AKU saludos. a.
  18. abeltio

    Desuperheating necessary/senseful

    With steam inside the tubes, I would use a vertical heat exchanger so the level of condensate inside the tubes will "limit" the useful heat transfer surface. Horizontal tubes will have an impact on the distribution of temperatures leading to bowing (hogging) of the tubes, loss of efficiency...
  19. abeltio

    Shell and Tube Heat Exchanger Design

    Speaking from experience, manufacturing shell and tube heat exchangers is the "science of drilling holes" in the tubesheet and baffles. I would use Process Heat Transfer, Donald Q. Kern for a first approach at sizing it and have an idea of how big the HX is. Then, give it to a professional...
  20. abeltio

    Steam turbine performance testing

    It's too small compared to the rest of the plant so, unless it is obvious something wrong is happening, there is not much to be gained with an improvement in it's efficiency. Most modern combined cycle plants use electric motors instead of steam turbines for the BFWP, it is much easier, cleaner...

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