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I need to increase the current flow rate (1232 GPM) to the desired flow rate (1800 GPM) because some of the tools require testing at flow rates that high.

The pump should be able to handle the flow rates with 180 ft of pressure head no problem. There is about 80 ft of piping from the pump to the tool and then another 80 feet back with a few 90 degree bends. I know that this will add friction head and I have found the equivalent head in feet to help find the total pressure drops.

Where I am at a loss is here:

The majority of the system is 6" ductile iron but once it goes into the building it goes to a 4" flex hose for 15 ft then into the tool (about 2" diameter) then back into another 15 ft of 4" flex hose before heading back to the tank through the 6" ductile iron.

I know that the 30 ft of 4" hoses are greatly decreasing the flow rate, because I ran the pump without going through the tool and already increase from 1232 to 1476 GPM and the tool is only about 5 ft long. I have not had a fluid mechanics course yet but have been trying to do research online to teach it to myself.

I don't expect a solution, but I would greatly appreciate guidance on what the best equations to use would be and how to go about it. I think that completely removing any 4" components and knocking up the rpm's on the pump slightly will allow us to achieve the 1800 GPM that is necessary but I need to have it in calculations before I can put in the request for the 6" fittings and flex hoses.

Thank You