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Recent content by steven17

  1. steven17

    Motor Speed Turn Down Ratio

    Thank you for more useful responses. Based on responses to date, I am thinking of getting a premium efficiency, VFD duty, constant torque motor, which seems to provide the answer to my question. I don't need 10:1 turn down. I will be happy with 6:1 turn down capability without overheating...
  2. steven17

    Motor Speed Turn Down Ratio

    Thank you all for good comments and responses. The pump in consideration is a rotary lobe (positive displacement) pump that has flow ranges from 20 gpm (at low rpm) to 200 gpm (at high/full rpm of 60 Hz). The pump is direct driven by a motor through a gear box. The pump supplier says that the...
  3. steven17

    Motor Speed Turn Down Ratio

    I have a 40 HP, inverter duty, 1800 rpm motor fitted with VFD for sewage pumping application. Can this motor speed be turned down 6:1, i.e. down to 300 rpm without overheating issues?
  4. steven17

    Compressed Air Receiver

    Assuming SCF, the P2 would be P1x0.9. That looks pretty simple. Thanks.
  5. steven17

    Compressed Air Receiver

    I still don't get how I can calculate the resulting pressure from the formula of P1/m1=P2/m2. It seems that the calculation is not as straightforward as I thought.
  6. steven17

    Compressed Air Receiver

    I have a 1000 gallon air receiver charged at 150 psi. If I lose 100 gallon air due to consumption, what will be the resulting air pressure in the tank? I want to know the pressure drop relationship between fixed receiver tank size with initial pressure and resulting pressure due to air withdrawal.
  7. steven17

    Short Body Check Valve

    If I were looking for a standard, common sense engineering, I would not have asked for tips in this forum. I am just looking for ideas and experiences of other engineers who might have better suggestions. I appreciate your advice, which I will keep in mind.
  8. steven17

    Short Body Check Valve

    No, vertical installation is not a viable option.
  9. steven17

    Short Body Check Valve

    The Rubber Duckbill check valve is not the one we are looking for. We need a check valve with open/close limit switches. Yes, reorienting the pump is an option, but it needs a lot of extra costly piping modifications, which we want to avoid if possible.
  10. steven17

    Short Body Check Valve

    I am still looking for past user references based on the short body wafer style swing check valve in sewage applications. I am reasonably positive that this type of valve was used successfully in raw sewage handling pump stations.
  11. steven17

    Short Body Check Valve

    Rerouting the pump discharge pipe to a channel above the waterline is not a viable option at this existing facility. I am still looking for user references based on the short body wafer style swing check valve.
  12. steven17

    Short Body Check Valve

    This is an existing facility, and we do not have means to reroute the discharge piping to a channel.
  13. steven17

    Short Body Check Valve

    Yes, Red Valve is another option. But its body is quite large compared to the wafer body swing check valve. I will consider Red Valve as a last resort. Thanks.
  14. steven17

    Short Body Check Valve

    Thank you, bimr, for the information. I will be contacting those companies and see how they can help. The RitePro makes 42" valve, while Tyco and Cla-Val do not have 42", according to their websites. I am wondering if anyone has successfully used these wafer swing check valves in raw sewage...
  15. steven17

    Short Body Check Valve

    Thanks, itascot. The Bray (Checkrite) check valve is indeed the closest I came across so far. Its web site information is useful, but it still does not provide assurance that it can be used for raw sewage that carries a lot of solids (debris, rags, etc.) that could interfere with the internal...
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