Water Pump as a Motor?

You're doomed to fail, sorry.

Not even a peristaltic pump?

Where will you get the water? The question makes no sense.

Pumps require a motor to drive them. Motors require electricity. If you use a pump to produce 40-50PSI water and then use it to drive a generator it costs more than buying the electricity in the first place. If you push fluid backwards through a pump, you will produce little or no work.

What, exactly, are you trying to do?

Are you really trying to drive a generator with a pump?

Thank you for your responses. In fact, I am trying to develop a green project where speed bumps provide water for free, no cost at all. So, I want to take advantage of this resourse trying to use a system like pump-transmition-generator. Similar to eolic systems. The device or pump should be able to have enough force to put the system in motion. Some one recommended me peristaltic pumps because they have strong torke. Hope this give you an idea want I am looking for.

thank you

Now I understand perfectly.Thanks.

I fear that the efficiency of your system may be too low to be practical, although it would probably work. Some type of positive displacement pump, as you suggest, is the best choice.

Have you seen this? It may be more practical. Initial cost could be high.

Electricity generating speed bumps

So far, I have seen different types of speed bumpers in New zewland, England, Canada, USA, China, etc. Those designs are efficients but too expensive, and in some cases they have to dig under the road and high maintenance. In this project, as you say, may not be efficient but I am trying to find a key elements to balance between efficiency and cost in order to be attractive.

Thank you

OK. Have you searched for water powered hydraulic motors?

For simplicity, your idea of a peristaltic drive may well be the least expensive way to go.

[PDF] Water Powered Motor Drives

Thank you, again. I will find out more about the the option of water powered motor drives, it could be as i said an option. Thank you so much for all your inputs. If you have something else to comment I will appreciate it.

Have a good afternoon.

Drawing power from speed bumps is a maintenance nightmare. The speed bumps would probably be rubber squeeze-bulb type things, which can be damaged. Then you have a broken speed bump, and your system is down until it is repaired.

You would probably only be able to draw enough power from this system to drive a crossing light, no more. It would require steel under ground piping, which will rust out eventually. It will require a surge tank which will have to be buried somewhere, along with the generator package. Since the power input is erratic, a battery will be necessary, another maintenance item.

The water will have to be freeze proofed, and a pump lubricant will be needed. Water quality will have to be checked, leaks repaired.

Generating electricity is usually inefficient, it's usually only worth it when you have an abundance of available power, and a low maintenance generator.

This is a project, where I am trying to desing elements almost free of maintenance or at least with minimum maintenance. the weak element could be the hose, but it under consideration to replace it easily. If something fails, vehicules or cars will not be afected in a great way. So far I am working in a prototype and considering every detail to improve it, later it will be tested before we consider it as a product. On the other hand, I am considering not only one speed bumper, it will depend of the necesity of a potencial customer, speed bumpers could be 1 to 6 or more. To have an idea they are rounded and around 5 inches high. Hope understand what I am doing.

Thank you so much for your comment.

Regards.

Have a good afternoon

Hello guest,

40-50 pound pressure will operate a micro Pelton wheel generator. However the wattage produced depends on the litres of water flow per second.

Cheers

Peter

* I have find out that there is in the market a brand new water pump with the following characteristics:

* our motor requires approx 3 gpm (11.3 lpm) of flow to achieve 50 rpm.

· torque at 50 psi is approx. 55 in-lbs

· torque at 100 psi is approx. 140 in-lbs.

It seems to be a good option for the prototype, because of it low water consumption.

Regards