Design A Cart For 2 Yong Heng Compressors

You will likely be needing a better pump than the stock one with that kind of rise for the water flow.

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It's closed loop so once the water is flowing the fall cancels out the rise. The only restriction to water flow is the friction inside the tube.

I put a much larger pump on the system. If you want I can give you a full build list?

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Thank you for your input. The pump that comes with the compressor has plenty of flow for our application especially in closed loop. In your build with a radiator, no matter how fast you pump the water each water molecule spends the same amount of time in the heat source and radiator so cooling can not improve. If the pump that comes with these units could lift 10 feet, even though the flow may only be a few drops, as soon as the water comes out of the heat source and makes the fall back to the pump flow will return to the same as having the pump level with the compressor.

I have pumps and radiators but I'm thinking keep it simple so I may fab up an aluminum tank to fill the area under the top shelf.

I appreciate everyone's ideas and input so please keep them coming.

You will likely be needing a better pump than the stock one with that kind of rise for the water flow.

Click to expand...

It's closed loop so once the water is flowing the fall cancels out the rise. The only restriction to water flow is the friction inside the tube.

Click to expand...

The system is not sealed but his replacement pump will do a 10ft rise and has twice the stock Yong Heng output so he is probly good.

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Doesn't need to be sealed, as long as it has enough head pressure to start the return trip flow will return on the first pass to the same as having the pump level with the compressor. All you need is some extra tubing and maybe a connector to test it for yourself without the compressor. Double the flow will not increase cooling.

The lift does matter. These are weak little pumps.

Try lifting the return line out of the reservoir and raising it up a couple of feet. The flow will be cut in half. I have done this. 

Twice the flow usually means a bit stronger pump that can take a bit more rise and still keep pumping well.

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I don't think you're following me. The flow will be low with a high lift because you're not following that test up by adding a return line the same length as the lift. As soon as you connect the return line and let the water fall as far as it had to lift you will see the flow return to zero lift. You can even test this with one long piece of tubing. Connect the tubing to the pump in water then with the pump running and the tube full lift the tube at it's mid point as high as you want and the flow will remain the same.

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The Siphon Effect

As long as a pipeline is flowing full, the pump head required to maintain flow is equal to the head due to friction and the elevation increase between the pump discharge and the pipeline discharge. This rule holds true even if some point in between has an elevation greater than that of the pipeline discharge.

Figure 3 shows a simple piping system that illustrates this rule. The reason that the higher elevation (h2) seen between the pump and pipe discharge does not affect pump head is due to head recovery provided by the "siphon effect."

Now, h2 must be accounted for when filling the line, but once it is flowing full the down leg will cancel its additional height and the elevation seen by the pump will be h1. If the down leg is not flowing full, the head required will be that of friction plus the sum of h1 and h2. The major difference between a true siphon and the siphon effect is the latter will not maintain flow by itself.








A pipeline with several up and down legs in series. In this example, each down leg produces a siphon effect and the total head seen by the pump, once the line is filled, is equal to h1 plus the friction in the line due to flow.






Although piping systems that rise and fall can take advantage of the siphon effect, they are also vulnerable to entrained or dissolved air accumulation at their high points. If not properly vented, air pockets can reduce and, in some cases, completely prohibit flow through the system. The chance of this occurring is increased in piping systems with multiple up and down legs. If some air is trapped in these upper areas but flow is maintained, the elevation head required to maintain flow will be h1 plus the sum of the heights of the air pockets in each down leg.

Source: https://www.pumpsandsystems.com/siphons-and-siphon-effect-sucking-sound

I have a plan in mind but I didn't want to build it and then see someone else's and say I wish I had thought of that.

I've been thinking about building a new welding cart with all three welders on it so I could remove the extra bits from my current welding cart and use it for the compressors.

The lift does matter. These are weak little pumps.

Try lifting the return line out of the reservoir and raising it up a couple of feet. The flow will be cut in half. I have done this. 

Twice the flow usually means a bit stronger pump that can take a bit more rise and still keep pumping well.

Click to expand...

I hope you understand that I'm only sharing the scientific facts and not simply arguing my opinion. I hate to see people spend their hard earned money for zero gain. I spent years in college to learn these things.

Edit: What I'm really trying to say is please don't be angry with me.

speaking for myself, I don't think anyone is angry here. part of the reason i significantly upgraded the pump was because of the lift as well as the pump it came with was just looking like a weak link in the chain. the compressor never ever got a little hot filling a 75 cu ft bottle from 3,000 to 4,300 in about 12 minutes.

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Thanks. As long as you have a return line there is no lift once the tube fills with water. You could connect 100 feet of tubing to the little pump that comes with a yong heng and turn on the pump. Once the tube is filled with water you could lift the middle of the tubing 50 feet above the pump and flow would remain exactly the same as the whole loop remaining level with the pump. The only head in a closed loop is the friction of water in contact with the tubing. To avoid confusion a closed loop does not mean sealed, it only means there is a return line where siphon cancels lift.