This formula assumes you have made a reducing conical jet. Generally the formula is you divide your suction hose diameter by 4.5- 5,25 to get the “jet size” this would be dependent on running intake pressure at around 30-35 psi and having a pump capable of moving minimum around 2200 liters per minute. Also you will need to stipulate what the design of the reducer is within the jet? To answer your question and perhaps steer you in the right direction you need to provide some more info such as the pump output and hp as well as the pump outlet diameter size. Im guessing you want a suction nozzle as you will be using this out of the water? This is just plain impractical! a 6 inch dredge hose is a monster to handle on a good day bloody hell having to man handle it via a suction nozzle setup! There is a reason none of the major dredge manufactures made a 6 inch suction nozzle and this is why. I’ve never heard of this type of setup on a suction nozzle and can tell you you will need 3 hoses to wrestle with 1 being the suction nozzle and x 2 high pressure lines to the jets. You talk about a suction nozzle setup ( you say you dont want a jet log) with a twin log setup?. The pump is probably the most important design consideration on a dredge! By far the best solution for this is a centrifugal pump with a closed impeller design. The key to a good performing dredge is having a good dredge pump that has a mixture of pressure and volume. Pressure and volume are important no matter what dredge you have!.
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