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  1. DrClassic

    CENTRIFUGAL PUMPS AND VFD pumps

    Begin with simple solutions coz the problem may be very simple.Do u have vent on top points? If not install . Air bubbles can increase pressure and cause pressure fluctuations among your system. Eccentric reducers for horizontal lines , unneeded fittings may cause the same problem.
  2. DrClassic

    Water Hammer Arrestor on hot water line

    Thanx to BigInch ,PEDARRIN2 , LittleInch , Compositepro , sailoday28 , PEDARRIN2 , Artisi , 3DDave for your valuable replies. The system is a pressurized one ; water is pumped directly to buildings . Also it is a housing project of not less than 300 toilets . The said project will be done in say...
  3. DrClassic

    Water Hammer Arrestor on hot water line

    Is it of any use to install water hammer arrestor on hot water line .My project consists of housing rooms with 50 liters electric water heaters .the owner requested WHA on both cold ends and hot ends . You know that Water Heater adds about 0.5 bar pressure loss to the circuit , so methinks it...
  4. DrClassic

    Water sprinklers to fight fire above false ceiling "pockets "

    Link to the thread in NFPA Forum http://www.eng-tips.com/viewthread.cfm?qid=414841
  5. DrClassic

    Water sprinklers to fight fire above false ceiling "pockets "

    Good Morning all In NFPA 13 it is stated that if distance between slab bottom and false ceiling is 900 mm or higher additional sprinklers will be installed to protect this "pocket " above false ceiling . The conditions under which those sprinklers should be installed are not clear , i.e. when it...
  6. DrClassic

    Water sprinklers to fight fire above false ceiling "pockets "

    Thanks to tygerdawg , 3DDave , chicopee , berkshire for their esteemed replies . Dear berkshire Kindly give me the link to this forum .
  7. DrClassic

    Water sprinklers to fight fire above false ceiling "pockets "

    Good Morning all In NFPA 13 it is stated that if distance between slab bottom and false ceiling is 900 mm or higher additional sprinklers will be installed to protect this "pocket " above false ceiling . The conditions under which those sprinklers should be installed are not clear , i.e. when it...
  8. DrClassic

    What is the standard fire pump for a 2 storey building for 2 fire hose cabinet

    Dear Triyk21 , a fire hose cabinet needs minimum of 50 gpm with a pressure not less than 3 bar according to Saudi Civil Defense regulations. So you'd calculate the pressure drop to the most remote FHC to determine if the pump is OK or not .
  9. DrClassic

    Lime Transfer Pump Underachieving

    You'd better include a schematic of the pumping system to help you find the problem .

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