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Post by GTCGreg on Apr 22, 2016 3:06:19 GMT
What size pump is it? May be cheaper to replace the whole unit with something more readily available. what, you expect them to post specs on their proprietary equipment? No, but I would think someone as knowledgeable as you are could figure that out.
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Post by the light works on Apr 22, 2016 4:07:32 GMT
what, you expect them to post specs on their proprietary equipment? No, but I would think someone as knowledgeable as you are could figure that out. they don't even have the frame size and RPM rating on the motor. using KW instead of HP is understandable - it IS metric, after all. but to not list the RPMs? apparently for this (defunct) company, they look at proper nameplates kind of like londoners look at turn signals.
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Post by c64 on Apr 23, 2016 16:53:48 GMT
Reverse osmosis requires a very high pressure at a certain flow rate. If the pump doesn't match, it can blow the membranes or won't give you any result. Without detailed specifications, you can't just replace the pump with something good.
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Post by the light works on Apr 24, 2016 1:50:26 GMT
Reverse osmosis requires a very high pressure at a certain flow rate. If the pump doesn't match, it can blow the membranes or won't give you any result. Without detailed specifications, you can't just replace the pump with something good. I'm not surprised.
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Post by c64 on Apr 24, 2016 8:46:20 GMT
Reverse osmosis requires a very high pressure at a certain flow rate. If the pump doesn't match, it can blow the membranes or won't give you any result. Without detailed specifications, you can't just replace the pump with something good. I'm not surprised. What you could do is to buy a decent motor with a sophisticated frequency converter. A modern frequency converter can not only monitor the RPM, it can also monitor the torque over the slip and power consumption. Then you can link the dial to torque and then slowly turn the dial until the system works as before. The frequency converter then adapts power to maintain a somewhat constant pressure inside the system. This would be your best chance to make it work well while reducing the risks of blowing the membranes.
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Post by c64 on Apr 24, 2016 8:53:59 GMT
Whenever I encounter a burned out motor, I just take it to a specialist down the street from where I live. The next day they tell me which motors they have or can order or custom make to match and if it's worth to rebuild the old one. If you can't find someone who can read the specs out of the burned out motor, you might want to try them: www.profitlich-motoren.de/
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Post by the light works on Apr 24, 2016 14:08:18 GMT
Whenever I encounter a burned out motor, I just take it to a specialist down the street from where I live. The next day they tell me which motors they have or can order or custom make to match and if it's worth to rebuild the old one. If you can't find someone who can read the specs out of the burned out motor, you might want to try them: www.profitlich-motoren.de/the motor is in at the specialist. we expect to hear this week what the best option will be.
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Post by the light works on Apr 27, 2016 15:18:22 GMT
the specialist found us a replacement motor. costs about twice what it could have, but still a third of the cost of replacing the pump.
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Post by GTCGreg on Apr 27, 2016 15:58:01 GMT
the specialist found us a replacement motor. costs about twice what it could have, but still a third of the cost of replacing the pump. Good to have a solution. And now that you know the specs, maybe next time it will be easier.
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Post by the light works on Apr 28, 2016 0:26:08 GMT
the specialist found us a replacement motor. costs about twice what it could have, but still a third of the cost of replacing the pump. Good to have a solution. And now that you know the specs, maybe next time it will be easier. most likely next time will be when it suffers catastrophic systems failure and has to be completely replaced. - and hopefully that will be after someone else owns it. (but I'm not going to count on it.)
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Post by the light works on May 12, 2016 1:55:59 GMT
and the reverse osmosis system is up and running again. the new motor is about half again as big, half again as heavy, and half again as quiet. and it will probably last 5 times as long.
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Post by GTCGreg on May 12, 2016 2:31:30 GMT
and the reverse osmosis system is up and running again. the new motor is about half again as big, half again as heavy, and half again as quiet. and it will probably last 5 times as long. If the motor turns the wrong direction, do you have forward osmosis?
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Post by the light works on May 12, 2016 2:40:02 GMT
and the reverse osmosis system is up and running again. the new motor is about half again as big, half again as heavy, and half again as quiet. and it will probably last 5 times as long. If the motor turns the wrong direction, do you have forward osmosis? good question.
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Post by c64 on May 13, 2016 17:27:08 GMT
Actually you can generate electricity with "forward osmosis".
Osmosis is two bodies of water separated by a membrane which can only let water pass, nothing else (in theory).
If one side of the membrane has something dissolved inside, nature tries to balance the two sides. Since it is impossible to exchange the stuff inside the water, pure water is exchanged instead. This can cause "osmotic pressure" you can use to generate electricity.
Here is a neat experiment:
Take raw eggs and remove the shell without damaging the membrane. This can be done quite easily by putting the eggs into strong vinegar for a while.
The inside of the eggs contains water and a lot of other stuff, e.g. salt. The membrane can let water pass but not everything else inside the egg. If you put the eggs into very salty water, the water inside the egg is forced out and the egg shrinks by loosing mass and volume. If you put the eggs into distilled water, water is forced inside. The egg expands as far as the membrane allows it to expand. Water will enter the egg until the pressure inside becomes as great as the osmotic pressure.
Reverse osmosis is adding artificial pressure greater than the osmotic pressure so water passes into the "wrong" direction causing a greater imbalance than the osmosis tries to fix. This is how you can remove salt and dirt out of water using mechanical energy (pressure). Modern life boats now have a hand crank operated reverse osmosis device on board so you can turn sea water into clean and salt free water you can drink. It is a lot of hard work, but it keeps you busy and alive.
You can also generate electricity by osmosis. There are experimental power plants which put sea water and water from a river on both sides of a membrane. The pressure in the sea water side increases and this gives you a flow you can use a turbine with. The problem is that you only gain a relative low pressure and you need to constantly replace the salt water in the pressure side to keep the osmotic pressure up. Very hard to do and great effort generates only very little electricity so this can't be economic (yet).
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