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  1. flexiblycool

    Fan sSelection criteria

    Willard3 If hiring a ventillation Engineer is advised, then what is the purpose of this Forum?
  2. flexiblycool

    Application of Pascal's Law in a tall vertical pressurized pipe with water as in Fire Standpipe

    Thanks zdas04 The only problem with achieving the test pressure of 225 psi at the base of the riser is that the pipe joints at higher elevations will see much lower pressures, which seems to circumvent the stringent test requirements. My concern is that are we really interpreting the NFPA code...
  3. flexiblycool

    ZONE AND FLOOR CONTROL VALVES ARRANGEMENT PER NFPA

    To: Cry22 Please allow me to shed more light about the sketch. As you have stated, there are indeed two corridors in parallel in each of the wards but both end up in the main corridor and not in any independent staircase of their own. The zone valves for each ward are provided to isolate the...
  4. flexiblycool

    ZONE AND FLOOR CONTROL VALVES ARRANGEMENT PER NFPA

    To : Cry22 As far as I am concerned, you have outdone all the others who responded to this thread, by not getting caught by the omission of the word please, even though the non-dictionary compliant substitute Request and Thanks (in advance) were clearly spelled out. The technical content of your...
  5. flexiblycool

    ZONE AND FLOOR CONTROL VALVES ARRANGEMENT PER NFPA

    And i agree with 317069. people typically ask for answers and don't request. Especially with no specific information given. I did not want to argue with 317069,but I am surprised that you are missed the word: REQUEST and THANKS in my original post.
  6. flexiblycool

    ZONE AND FLOOR CONTROL VALVES ARRANGEMENT PER NFPA

    To: 317069: Thanks for pointing out the omission. I was not aware that the answers are sold on the forum. I have read tons of discussions all the way from novices to experts in such forums and no one demanded the last months pay. Thanks anyway for your answer. To: willard3: Thanks for pointing...
  7. flexiblycool

    ZONE AND FLOOR CONTROL VALVES ARRANGEMENT PER NFPA

    REQUEST FEEDBACK IF THE ATTACHED ARRANGEMENT OF VALVES PACKAGE AND HOSE REELS IS IN COMPLIANCE WITH NFPA. THANKShttp://files.engineering.com/getfile.aspx?folder=772dec60-3a7a-49a9-863a-b1c4bd741599&file=TYPICAL_FLOOR_LAYOUT.jpg
  8. flexiblycool

    DOMESTIC WATER REQUIREMENTS FOR OUTPATIENTS IN DAY HEALTH CENTERS AND CLINICS

    Thanks dbill74 Unlike the office worker, the outpatient is likely in the clinic for as long it takes to see the doctor, so I wonder if the office figures should be used. I am looking for any precise guideline developed for design of health centers and the water storage tank holding capacity...
  9. flexiblycool

    DOMESTIC WATER REQUIREMENTS FOR OUTPATIENTS IN DAY HEALTH CENTERS AND CLINICS

    I am searching for design estimate of daily water consumption by outpatients in health care facilities. The only data I found was about Guidelines for minimum emergency water quantity for outpatients which is 5 liters/out-patient. I would appreciate any data about regular daily water consumption...
  10. flexiblycool

    Chilled and Steam Pipe network of Air Handling Units

    ChasBean1 The amusing rhetoric aside, I wish to find out if there are minimum standards and quantitative/qualitative engineering procedures of flushing steam lines (not just from the point of view of avoiding liability). Or is the procedure summed up and practiced like you have done? What does...
  11. flexiblycool

    Chilled and Steam Pipe network of Air Handling Units

    We routinely flush new chilled water pipe networks by bypassing all the equipment such as chillers, FCUs, etc, then do the removal of rust and finally introduce corrosion inhibiting chemicals in preparation of commissioning the system. I would like to know the procedures for flushing and...
  12. flexiblycool

    Steam Pipe Network Flushing methods

    i want to know how to flush the new steam pipe network. Is it flushed by steam or by water and how about the condensate portion of the piping. Is it flushed by gravity or under pressure? Where can I find detailed guidelines of how to flush our welded black steel pipes of the steam network all...
  13. flexiblycool

    chilled water system controls

    317069 To err is human, so I don’t consider the designer infallible, nor do I believe in becoming so reluctant so as not to try to undo the mistake. Evidently the system is flawed as commented by Drazen. This is precisely the reason of my seeking the consensus of this Forum and for trying to...
  14. flexiblycool

    chilled water system controls

    Your comments are taken very positively and with gratitude. The point I was trying to make in my comment dated 24 August at 11:11 was that the term secondary pumps without the hydraulic decoupler is a misnomer. The continuous duty, constant speed pumps are just boosting the pressure regardless...
  15. flexiblycool

    chilled water system controls

    The comment about the pump delivering more than its design flow is not clear. Since the pump can perform along its characteristic curve only, in order to deliver 1200 GPM, the developed head would have to be much lesser than the design head. So with this higher flow, the water would not reach...
  16. flexiblycool

    chilled water system controls

    Drazen: To get the benefit of the decoupler, the secondary pumps should be VFD. This retrofit (of Providing VFDs) is a major expense. Furthermore these pumps could never be shut-off because the demand will not have been met in some FCUs. What can however be done and I have said that previously...
  17. flexiblycool

    Pump Controls

    cloa (petroleum) Sorry I did not understand your message. Please elaborate
  18. flexiblycool

    chilled water system controls

    It looks like the consensus is to make me cry. I can go as far as removing the redundant secondary pumps, but cannot demolish everything to make it perfect. That would be fine for the next project. I hope you agree. Thanks a lot in any case because the discussion shed much light about the...
  19. flexiblycool

    Pump Controls

    LittleInch: Thanks for the insights. By the way, the Main Contractor probably knew very well what it will take to water balance the system (which I modeled for simplification as consisting of 60 FCUs, actually has over 400 fan coil units and about 30 AHUs). So guess what, the shrewd Contractor...
  20. flexiblycool

    Pump Controls

    Hello LittleInch: Yes your feedback was of great help. Thanks a lot. The Autocad operator was not available to draw the sketch with all the buildings. I did this lash up job on the Xcel!, that's why the return line loop is not running side by side to the supply. Today, I collected more data with...

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