What is gpm in a 3 inch pipe at 90 psi?

To calculate gallons per minute (GPM) in a 3-inch pipe at 90 psi, you can use the hydraulic formula that relates pressure, pipe diameter, and flow rate. Generally, for a 3-inch pipe, the flow rate at 90 psi can be estimated to be around 1,000 to 1,200 GPM, depending on factors such as pipe length, fittings, and the specific fluid properties. For precise calculations, it's advisable to consider additional factors like friction loss and fluid viscosity.