Figure P4.25 shows a pump and pipe network being used to transport heptane at 120°F to a large, elevated, closed storage tank. The tank is pressurized and maintained at 18 psia. The volumetric flow rate of the heptane is 500 gpm.

a. Specify the nominal diameter of the check valve.

b. Determine the pump discharge pressure required (psia) to move the heptane through the discharge pipe.

c. Investigate the effect of the absolute roughness of the pipe. Construct a plot that shows the variation in pressure drop as a function of the absolute roughness for values ranging from 0 to 0.01 ft.

Liquid level Plank = 18 psia 40 ft FIGURE P4.25 Pressurized storage tank system. Large pressurized storage tank Pump All pipes are 6-nom sch 40 commercial steel Standard 90 elbows and 180 bend Total length of straight pipe = 115 ft Class 300 swing check valve INH