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Recent content by 121202

  1. 121202

    Compressor Reverse Flow Relief Sizing

    ETG01, The link to the API 521 interpretation that you provided appears to suggest that a shutdown valve together with a check valve in series is adequate protection for backflow. Is that your interpretation? For clarity the shutdown valve on the discharge of the compressor is driven shut by...
  2. 121202

    PSV location

    Brainstorming, I do not believe that the "0.7 x Sonic Velocity" requirement is a manditory code requirement. However, it is common practice to limit tail pipe velocities to this figure for two reasons: - Firstly and most importantly, at velocities above 0.7 x sonic velocity there is a risk...
  3. 121202

    Compressor Reverse Flow Relief Sizing

    EGT01, Thanks for your concise and professional input, it is appreciated. I am familiar with the paragraph in API 521 that you are referring to. Just to clarify, in my particular situation for backflow to occur there needs to be a failure of both the shutdown valve (a fail closed ball valve)...
  4. 121202

    Shell and Tube X changer- Automated valves

    Automated shutdown valves are often installed on the cooling water supply and return lines of shell and tube exchangers for the simple reason that they limit the migration of hydrocarbon vapor into the cooling water system in the event of a tube rupture. Obviously the impact on plant safety has...
  5. 121202

    P&ID sample drawing and rules

    P&ID development is not something that is easily learnt from books. It takes training and a good deal of experience. I suggest that you employ a competant Process Plant Contracting company to help you.
  6. 121202

    CONTROL VALVE NOISE

    You've got the wrong type of valve. Suggest that you look at valves with multistage trims.
  7. 121202

    TEG DEHYDRATION UNIT

    Bottom line is if you are sampling regularly and there is no evidence of degradation then leave well alone.
  8. 121202

    PSV location

    PSVs do not have to be directly flanged to the vessel being protected. In fact this is rarely done given the general requirement that PSVs have to discharge to a flare system. I'd give the following advice on layout and design of piping - The PSV tail pipe should fall all the way towards...
  9. 121202

    Compressor Reverse Flow Relief Sizing

    The compressors are centrifugal. The HAZOP report did not recommend any additional protection from reverse flow other than the existing non slam check valve.
  10. 121202

    Turbine Generator Output Control

    byrdj thanks for your great answer. Just to make sure I'm following you. The gas generator will operate at basically constant speed? If that is true then the air flowrate (mass basis) drawn into the compressor will basically be constant. The only variable that can therefore be adjusted to...
  11. 121202

    Piping Brittle Fracture Risk During Blowdown

    When plant containing pressurised gases and liquids is blowndown (depressurised), the depressurisation can cause piping and vessels to become chilled. The temperature within the plant drops as the pressure drops and the minimum vessel and piping temperatures coincide with the minimum internal...
  12. 121202

    Turbine Generator Control

    How is the output power of a turbine generator controlled? Please explain the entire system including reference to - Control of the gas generator and power turbine - The control of the fuel\heat rate - How the electrical output of the generator is controlled My understanding is pretty basic...
  13. 121202

    Turbine Generator Output Control

    How is the output power of a turbine generator controlled? Please explain the entire system including reference to - Control of the gas generator and power turbine - The control of the fuel\heat rate - How the electrical output of the generator is controlled My understanding is pretty basic...
  14. 121202

    Lateral Torsional Buckling

    What constitutes lateral support to prevent lateral torsional buckling in steel I-Section beams? For example, is it adequate to provide transverse stringers connected to the compression flanges of parallel beams, i.e. to provide a grid structure? If that is acceptable I presume that you...
  15. 121202

    Lateral Support

    What constitutes lateral support to prevent lateral torsional buckling in steel I-Section beams? For example, is it adequate to provide transverse stringers connected to the compression flanges of parallel beams, i.e. to provide a grid structure? If that is acceptable I presume that you...
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