Solve using moody's diagram. On a farm, water is delivered from a pressurized storage tank to an animal watering trough through 300 feet of 1-1/2 inch Schedule 40 steel pipe. The pipe rise from tank to trough is 3 feet. Calculate the required air pressure above the water in the tank to produce 75 gal/min of flow. Flow area of schedule 40 steel pipe 1-1/2 inch = 2.036 in^2 or 0.01414 ft^2.