One of my dealer called me up and asked my advice about the burned RO motor. His client was complaining about the quality of the said motor and again asking for a warranty.
Based on the details and data that I gathered, it was due to incomplete safety feature of the system. Here are the results of the investigation.
1) System is suffering from cavitation or low feed volume(volume of water coming to the pumphead/Procon is insufficient) thus breaking the carbon parts of the pumphead.
2)As the carbon parts were broken, it prevented the pumphead shaft from rotating and since it was attached to the RO motor shaft,said motor was forced to rotate it’s shaft unsuccessfully resulting to the increase in ampere rating that lead to the burning of the motor winding.
Burning of motor could have been prevented if safety devices were incorporated to the design of the system such as:
1)Low pressure switch- in events where in there is low feed volume and pressure, said switch would immediately cut the current, thus stopping the rotation of the RO motor and pumphead.
2)Magnetic contactor and overload relay- should there be an increase in ampere rating,at a given setting, it will cut the power supply going to the RO motor.
Most of the times,clients felt that if there is a problem with any of the parts they are using, they usually blame it’s quality and not considering the entire design of the system.
Just sharing my experience.
- Orly Shanghai
3 comments:
very informative.
Sir orly.question lang po..ang set-up ko po dati ay single R.O.Membrane at procon series 4 ang gamit ko..then nagdagdag ako ng R.O.Membrane kaso hindi ko napalitan yun R.O. pump..naging maingay yun bomba at bumaba ang pressure sa R.O. from 100 psi to 50 psi.I think hindi kaya ng Procon ang feed volume sa R.O. Membrane. Kailangan ko po ba palitan ang pump at ano ang advisable na pump horizontal o vertical pump..please help..thanks..willie
Sir Willie,
this is malu, secretary of sir orly, He already read your concerns however, as of the moment, he is loaded with some important matters and rest assured he'll get back to you before this week ends. thank you!
Dear Willie,
Sorry for the late reply, I have been too very busy this past few days. With regards to your concern,your pump head or Procon is damage as per indication that the pressure dropped from 100 to 50 psi.
Whether you add an additional membrane or not it has no relation with the problem on your pump head.
First, your pump head has a certain flow rate specs, which is on your case is at 5.5 gpm or gallons per minute, and as per design, is suitable for one membrane machine, now if you install an additional membrane then your flow rate will just be divided into your 2 membranes and no significant flow rate increase will happen (if it is in parallel connection, meaning,same in for feed flow and same out for the reject and product). If you are not very particular with the TDS of your product water, you can adapt the series installation( reject of the first membrane will go to the second membrane)and with that, you can have a significant increase in your production.Your problem now is starvation or cavitation issue wherein the flow of water going to your pump head is not enough therefore damaging the carbon impeller of your pump head. What can I suggest is for you, to have your system analyzed by your technician to determine the cause of insufficient flow rate.
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