A steel pipeline of 50 mm outer diameter carries steam at 250°C. It is insulated with two layers of insulation: the inner layer is 30 mm thick with k=0.08 W/mK, and the outer layer is 20 mm thick with k=0.05 W/mK. If the ambient temperature is 25°C and the outside heat transfer coefficient is 10 W/m²K, calculate the heat loss per meter length. Neglect pipe wall resistance.
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A centrifugal pump delivers 1500 liters/min against a head of 25 m. The impeller diameter is 300 mm and it runs at 1500 rpm. If the manometric efficiency is 75%, calculate the vane angle at the outlet. Sketch the outlet velocity triangle. A steel pipeline of 50 mm outer diameter