An ammonia production system has 30,000 pounds of nitrogen and 7,500 pounds of hydrogen available for the process in supply tanks. The supplies of nitrogen and hydrogen are refilled every 20 hours. There is a reserve required of 5,000 pounds of nitrogen and 1,000 pounds of hydrogen. The reserves must not be used in the process, they must remain in storage. When the system is operated at equipment capacity, it uses 420 pounds per hour of nitrogen and 90 pounds per hour of hydrogen producing 510 pounds of ammonia per hour. How much nitrogen is available per hour? How much hydrogen is available per hour? What is the limiting factor (equipment capacity or reactant supply)? If it is reactant supply, which reactant is most limiting? What is the maximum production rate of product that can be maintained continuously without shutdown?