The design of a pump and pipe system has been completed, except for the valves.
The system is used to transport water at 120°F through 2 nom sch 40 commercial steel pipe at a required flow rate of 85 gpm. Without the valves, the pump selected has the capability to overcome an additional 18 psi of pressure drop due to the valves and still provide the required flow rate. The pipe/valve joints are threaded. Determine how many 2-inch globe valves can be installed in this pump and pipe system.