![]() My concern is one pump might produce slightly more pressure and screw the whole thing up. You are currently using one pump to feed two jets, and another pump to feed the other two jets. If one of the jets is off, it pushes the column of water off to one side and efficiency drops dramatically. Next, for the system to work properly, the water has to come out of all four jets at the same pressure. You mentioned this early when talking about the "bulged section seen at the end provides a longer length of taper, in theory giving the water more time to become co-linear with the direction of flow down the pipe." You just need to make it longer. To get the water moving evenly, the first thing you need to do is add an 18" of straight tubing to the output side of the jet so the column of water has time to create uniform suction. And im not sure, but it seems I might have reached that point on the first fireup, with no performance optimization.īefore worrying about the generator, I would focus on refining the system so you get a working prototype.īasically, the goal is to produce balanced flow out of the jets so you are pushing at the center of the pipe thereby reducing losses because you are not losing energy on the sides of the tube. I just decided to incorporate them into a 3" system first and hope that the increases in efficiency outlined by Phil (Infinity jet, submerged system) would be enough to allow it to function as a slightly under powered 3". It would be more than enough for 2" though. On the performance curve for the electric pumps at 103 ft-head they should be putting out roughly 23 GPM, so for two pumps 46 gpm.Ĭlearly this is still low for a 3" or even a 2.5" dredge, according to the keene paper. Converted to feet of head thats around 104 ft. Power jets/ suction nozzles, according to the keene paper, run at 45 psi. Now the performance characteristics of the pumps: 3” and 4” power jet runs at 180 GPM at 35 psi 3”and 4” suction nozzle works at 106 GPM at 45 psi ![]() P180 pump produces up to 250 GPM and up to 160 foot head. PHP160 pump produces up to 200 GPM and up to 160 foot head.Ģ.5” suction nozzle works at 78 GPM at 45 psi.Ģ.5” power jet works at 106 GPM at 40 psi. P90G pump produces up to 100 GPM and up to 160 foot head.Ģ”suction nozzle works at 45 GPM at 35 psi. Its one of the few places that I was able to find actual number on the flows and PSI needed, but here is the critical distinction:įlows and PSI needed for suction nozzles/ power jets consumption, NOT what the maximum rating of the pumps are.Īccording to them, here is the important part of the paper for those uninterested in following the link :P I started here, where Keene engineering put together a paper on dredging basics/troubleshooting/making your own. ![]() But I did do a little bit of research first. It might sound stupid at first, using well pumps in this application. ![]()
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