12. Water at 180F is to be pumped through a long schedule 40, 3-in. commercial steel...

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12. Water at 180°F is to be pumped through a long schedule 40, 3-in. commercial steel pipeline. At steady-state operation, a Goulds 2×3-13 pump (Fig. 4–18) is operating at 180 gpm and 152 ft-lbf/lbm head. The pressure at the inlet to the pipeline is 14.7 psia. Find the pump placement required to prevent cavitation for the following: (a) Line elevation decreases at 1 ft per 50 ft of line length. (b) Line elevation decreases vertically, i.e., 1 ft per 1 ft of line length. (c) Discuss the results of (a) and (b). Rotor Pump Goulds designiation rpm dia. Fig. 8 in. 8 in. 1x1-8 3,500 3,550 1,750 4-16 4-16 1 2x3-10 2x3-13 10 in. 4-18 12. Water at 180°F is to be pumped through a long schedule 40, 3-in. commercial steel pipeline. At steady-state operation, a Goulds 2×3-13 pump (Fig. 4–18) is operating at 180 gpm and 152 ft-lbf/lbm head. The pressure at the inlet to the pipeline is 14.7 psia. Find the pump placement required to prevent cavitation for the following: (a) Line elevation decreases at 1 ft per 50 ft of line length. (b) Line elevation decreases vertically, i.e., 1 ft per 1 ft of line length. (c) Discuss the results of (a) and (b). Rotor Pump Goulds designiation rpm dia. Fig. 8 in. 8 in. 1x1-8 3,500 3,550 1,750 4-16 4-16 1 2x3-10 2x3-13 10 in. 4-18