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Recent content by afa13

  1. afa13

    Fire Dampers insulation

    The manufacturer says that it is o.k as long as the insulation doesn't interfere with the motor's operation much like what Chicopee said.
  2. afa13

    UPS ROOM AND TRANSFORMER ROOM

    First of all, it is preferred to keep a positive pressure in the ups. How is air supplied to the room? You need to account for humidification/dehumidification needs. If your supply is too cold, it might lead to electrostatic discharge. Be careful when setting the supply temperature. According...
  3. afa13

    UPS ROOM AND TRANSFORMER ROOM

    you can use 10 ACPH for the UPS room and 5 CFM/kVA of transformer for the transformer room. This is a rule of thumb, you must check with the design engineer for a more accurate answer.
  4. afa13

    Fire Dampers insulation

    Chicopee, The sides of the damper are insulated. The motor is not so that heat can be dissipated to the surrounding air instead of it being trapped between the motor and the duct which might lead to condensation. I did not want for the damper to be completely exposed to surrounding air, which...
  5. afa13

    Fire Dampers insulation

    Hey everyone, I need your help on the following. Do fire dampers (motorized) need insulation when they are installed in the supply or return line to prevent heat loss and condensation? In the fresh air ductwork, you don't but I'm afraid that on the supply and return you might need to insulate...
  6. afa13

    Expansion Tank

    "Example: If the Expansion tank is charged at 40psig and the pump head is 30psi. 1. If the expansion tank is installed at the suction side of the pump. The suction pressure is 40psig and the discharge pressure is 40+30 = 70psig. 2. If the expansion tank is installed at the discharge side of...
  7. afa13

    SS/GI connection

    guys, the issue is not thge material of the duct for this has already been agreed upon. Ducting serving hazardous areas will be SS (fully welded). The issue is the connection between the two materials which will be done in an adjacent room. The ss branch will connect to the GI duct in an...
  8. afa13

    SS/GI connection

    Hey Guys, The switch from GI to SS is for protection purposes. The room the SS duct is serving has batteries in it and due to chemicals GI might corrode thus the change in materials. The SS is used in the supply as well as the exhaust.
  9. afa13

    Laboratory for Hydrocarbons design

    Room temperature setting is up to you (but you have to be careful with humidity and condensation). Minimum ventilation rates can be found in ASHRAE 62.1 To get a negative pressure you have to make sure that exhaust air flow rate is higher than the supply flow rate. I would also recommend blast...
  10. afa13

    SS/GI connection

    Anyone???
  11. afa13

    SS/GI connection

    Hello everyone, Is there a risk from connecting a Stainless Steel 316L duct to a galvanized steel duct directly together (only thing seperating them is the gasket in between the flanges)? If so what would be the recommendation to avoid galvanic corrosion? On a similar note, let us say there are...
  12. afa13

    Expansion Tank

    Thanks for the confirmation
  13. afa13

    Expansion Tank

    When the pump operates, the pressure differential of the pump will higher than zero. The pressure at the discharge will be equal to the pump head whereas the pressure on the suction side will be equal to the pump pressure minus the pump head. is this why the expansion tank should be installed on...
  14. afa13

    Expansion Tank

    thank you guys! enlighting posts however i need the mathematical explanation for not installing the expansion tank at the discharge side of the pump.
  15. afa13

    Expansion Tank

    Hey guys, Can someone please explain to me mathematically why should the expansion tank be connected to the suction side of the pump and not at the discharge. I can't seem to understand the point of no pressure change. Doesn't the tank itself exert pressure on the water network? Expansion tank...
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