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Recent content by feather

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    Dissolved O2 removal from boiler feed water

    Your method wil reduce the number of stages in the deaerator section to 1, which will significantly reduce the O2 removal. Draw a Thiele diagram to see the difference it makes. There are spray/tray designs, but it sounds as if you are trying to reduce the G in the L/G ratio beneath the trays...
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    Deionized Water

    Check the label of many bottled waters, and you will see that they are indeed de-mineralized. Some by RO, some by IX, and then bottled. Some have minute minerals added back for taste, but some don't. I can't see how demin water could hurt you, unless material leached from the container into...
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    Too low pH after RO

    My error. I meant Vintage70, not Chris73.
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    Kinetico versus Rain Soft

    Everyone's got to earn a living, even water treatment salesmen, but.... I've been associated with the industrial water business for many years. When I recommend and buy home water softening/iron removal/RO systems, I go to Lowes, Home Depot, Sears, etc. The cost is about 1/5, less if the unit...
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    Too low pH after RO

    The low pH is expected with CO2 passing the membrane; with low conductivity water the pH depression could be more significant. Chris73 has the answer for you.
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    VFD

    Thanks for the help. I read part of the Toshiba manual about the constant torque, and the end user has to change it from the factory settings to activate it. It seems to me you located the problem. Keith
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    VFD

    tmahan The unit is an S9. Is jbartos correct when he sayts that the fan is independent of the drivespeed, so that cooling is less of an issue? If I put the unit into true torque, will that overload the motor? They have managed to misplace the manual. Thanks for the location of the online...
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    VFD

    Thanks for the help. It will take a while to digest all the suggestions. The motor is inverter duty, and both the drive and the motor are 1 HP. Tho motor is rated for 3.70 A at 230V. I don´t know the Toshiba model number offhand. The overload curve will be checked. The electrical controls...
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    VFD

    A client recently installed a screw conveyor with a Toshiba VFD, both 1HP. The system ran fine at full load, but when turned down to 40%, the controller indicated overload. We have a number of opinions around the plant, including the motor must be too small and that the VFD should be...
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    Using CO2 for pH control in cooling water systems

    Your situation is very common. pH control, with the elimination of chrome and chlorine gas, has been an ongoing concern. In the bad old days, small levels of chrome could be used and bio and corrosion were eliminated, and since the system could run acidic, scaling was negligable. But, times...
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    Using CO2 for pH control in cooling water systems

    Hello Wayne's reply is thorough. The issue is that the CO2, bicarb and carbonate are in equilibrium, and as long as the system is open, the CO2 will blow off, and the equilibrium will be re-established. The temperature affects the equilibrium, but since the rate of alkalinity accumulation...
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