What is the gpm on a 1 inch pipe horizontal with 70 psi?

The flow rate (gallons per minute, or GPM) through a 1-inch horizontal pipe at 70 PSI can vary based on factors like the length of the pipe, fittings, and fluid characteristics. However, a rough estimate for water flow through a 1-inch pipe at that pressure is approximately 20-25 GPM. For a more accurate calculation, you would need to consider additional factors, including pipe length and any elevation changes.