An oil pipeline and a 1.3–m3 rigid air tank are connected to each other by a manometer, as shown in Fig. P3–149. If the tank contains 15 kg of air at 80°C.

determine (a) the absolute pressure in the pipeline and (b) the change in Δh when the temperature in the tank drops to 20°C. Assume the pressure in the oil pipeline to remain constant, and the air volume in the manometer to be negligible relative to the volume of the tank.

 

Oil SG = 2.68 1.3 m Air. 80C h = 75 cm Ah = 20 cm 3D D=4 mm 50 `Mercury SG = 13.6 FIGURE P3-149