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There are a lot more factors that must be considered in order to give you an accurate number, such as the length of pipe, type of pipe, number of valves in line, tees, elbows. Water pressure will drop as the water flows along the line, and as it encounters turns, valves, tees, sprinklers, etc. I'll give you a rough estimate of 23 gpm, but this is an extremely rough estimate. You will need to figure out the complete layout with all valves, turns, sprinklers, etc, then consult an expert to get a better estimate.

Q: What is the flow rate of water in a 0.75 inch pipe at 30 psi?

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The answer depends on the flow rate or the water pressure, not just the pipe size.

The time it takes to flow 300 gallons through a 1 inch pipe at 55 psi depends on the flow rate of the pipe. You would need to know the flow rate in gallons per minute (GPM) of the 1 inch pipe to calculate the time it takes. Without the flow rate, it is not possible to determine the exact time it will take.

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The average velocity of water in a pipe depends on the flow rate of the water and the cross-sectional area of the pipe. It can be calculated by dividing the flow rate by the cross-sectional area. The units are typically expressed in meters per second.

For laminar flow? For a full pipe? for a 3/4-full pipe? For a 1/2-full pipe? It all makes quite a difference. Please repost your question with a little more information. It would also help to for us to know the coefficient of friction of the inside of the pipe.

Assuming that the pressure remains at a constant, reducing the diameter of the pipe will increase the water flow. On the contrary, increasing the diameter would cause the water to flow at a much slower rate.

To calculate the flow of water in a pipe, you would need to know the diameter of the pipe, the pressure (40 psi), and the fluid properties. The flow rate can be determined using the Darcy-Weisbach equation, taking into account the pipe diameter, pressure, and fluid characteristics. Without more information, it is not possible to determine the flow rate accurately.