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  • Users: dynamo78
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  1. dynamo78

    Valves' Cvs

    Hello fellow members, I just want to recall my HVAC knowledge if it still applies. Say, I have a cooling coil with 33Ft. PD @ 125 GPM, my old school knowledge says that I should a control valve with a CV of 8-9. Will that change if I have VFD in the chiller system? I appreciate any comment to...
  2. dynamo78

    Dry pipe system

    Hi fellow members. I am being trained in the design of sprinkler and read in the NFPA 13 standard, for dry system, that if the air volume being delivered by the compressor is less than 5.5 CFM at 10 PSI, then an "Air maintenance device" is not required .I calculated the volume of the system to...
  3. dynamo78

    Fan static pressure

    I have to replace several fans that were installed in the 70s. I don't have any cat sheet or drawings to verify their performance and data, manufacturer closed shop. I know their CFM and actual Hp. I figured out that in order to verify the static pressures of each fan, I have to plot the CFM and...
  4. dynamo78

    CH water calculations

    Can I used this equation to determine Chilled water GPM: Qt= GPM x 500x Delta T Qt= Total heat @ BTU/hr. Latent and sensible heat Delta T= Temp. difference between entering and leaving cooling coil. My point:Since the chilled water can handle sensible and latent load (Qt which is equal to: CFM...
  5. dynamo78

    Outside air intake filters

    The place is a facility with a 24/7 electronics equipment running, so I would say its a critical area. Backgrounder: They have the AHUs and ducts investigated for dust, molds and fungus, the result is negative, no signs of micro organism growths,aside from the accumulated dust in the return...
  6. dynamo78

    Strength of Materials

    We are auditing Pressure vessels in the refinery & was task to verify Safety factor used on them, a)Is there a place in the code that mentions safety factor in the calcs?we were informed ASME is 5:1 until during world war II while API- ASME is 4:1 from 1934 until They merged in 1952.then 3:1,at...
  7. dynamo78

    Blind flange

    I am new in Petro chem industry,Do blind flanges have different faces too,like flat, raised and ring joint faces? Thank you Feati

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