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Recent content by mabed

  1. mabed

    Manifolded chilled water primary

    sorry about the link i paste it by mistake
  2. mabed

    Manifolded chilled water primary

    I have to disagree with you; the static balancing valves will be used to set the maximum allowed flow in each unit regardless of the two way valve. If for example a unit need 10 gpm at the maximum load, the balancing valve will be adjusted so that at maximum load this valve will not allow more...
  3. mabed

    Manifolded chilled water primary

    I know that this site cant be taken as a reference it is just for tips, and all the problems are already risen to the designer. the two way valves at each unit will control the required flow for each AHU depend on the room temperature, so the system will be balanced even if the system in not at...
  4. mabed

    Manifolded chilled water primary

    Thank you for your help and I'm sorry I couldn't reply to my own thread before. I work in a contracting company and this project is at its final design stage and the system can’t be changed (I totally agree with Mr. Cry22 if it’s up to me I would go with one pump for each chiller.) The...
  5. mabed

    Manifolded chilled water primary

    I have a chilled water system with the following equipment: -16 chillers 600 gpm each -6 constant speed primary pumps 1600 gpm @ 85 ft of water each. -Three sets of variable speed secondary pumps. * 1st set 4 pumps 1800 gpm @ 130 ft of water. (serving low level) * 2nd set 2 pumps 700 gpm...
  6. mabed

    Fire pump flow

    I have both fire hydrants and building landing valves and sprinklers supplied form same pump. Is it a good argument to rise that at 150% of rated capacity, the pump will provide the 1500 gpm, while maintaining 65% of rated head? The pump head is calculated assuming 100 PSI at the most demanding...
  7. mabed

    Fire pump flow

    four times mentioning NFPA in my post and still not clear which code I am using. and still not clear if it is sprinklered or not
  8. mabed

    Fire pump flow

    Good day, I am checking the fire drawings of a project, The fire pump is sized to be 1500 gpm, but as per NFPA 14 section 7.10.1.1.5 "The maximum flow rate shall be 1000 gpm (3785 L/min) for buildings that are sprinklered throughout, in accordance with NFPA13, Standard for the Installation of...
  9. mabed

    VAV vs FCU system

    Fresh air duct is relatively small compared to supply/Return air duct. I need 10 Tons FA duct vs. 35 Tons supply and return ducts. With VAV I need 14 AHU; with FCU I only need 2 for fresh air. As for chilled water network like I said before it is already going to roof so I'll replace the duct...
  10. mabed

    VAV vs FCU system

    I have fresh air handling unit and ducts connected to each fan coil. True, but you save in ducting, dampers and AHUs
  11. mabed

    VAV vs FCU system

    I'm working on a ten floors office building, and the A/C system is chilled water air handling units in first and roof floors with VAVs (about 35 VAV per floor). I am checking if it will save money and installation time to change to chilled water fan coil units since my chilled water riser...
  12. mabed

    Combine light hazard and ordinary hazard spaces to one zone control valve

    I am working on an office building, and have a mechanical space for air handling units adjacent to office space. My question is can I combine both spaces to one sprinklers zone control valve or do I need one for ordinary hazard area and one for light hazard?
  13. mabed

    How ro protect operating rooms from fire??

    can you point where the violation is. Motorized fire dampers at all air openings and fire rated doors. I found this article and I think it is helpful to understand what is going on in OR. http://www.mdsr.ecri.org/summary/detail.aspx?doc_id=8197&q=operating+AND+room
  14. mabed

    How ro protect operating rooms from fire??

    outside in saudi arabia but follow NFPA
  15. mabed

    How ro protect operating rooms from fire??

    I've been reading about this subject and I reached this conclusion: I'll install both Portable CO2 fire extinguisher and automatic FM200 system with two shutoff valves (one automatic and another manual). In case there is operation running, the FM200 will be shutoff and will depend on CO2 fire...
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