In a chemical plant liquid ammonia is stored in a large tank at 72 degrees F and 200 psig. Ammonia is pumped from this tank to a smaller tank for chemical process usage. The pump used to supply ammonia to the process tank is located 12 ft above the surface of the ammonia in the storage tank. If the frictional losses in the plumbing system leading to the pump are 3.5 ft, what is the net positive suction head (NPSH) available at the pump inlet?