IDuve sea level On the piping, there is one strainer, five 90 degree elbows, fou
ID: 2087970 • Letter: I
Question
IDuve sea level On the piping, there is one strainer, five 90 degree elbows, four T-junctions, four uate valves and one wlobe valve from the seawater intake to the hydrant valve Total length of piping is 60 m. Estimate the power required for the pump Assume 75% pump efficiency For seawater: p-1025 ku/m, v 1.110 m'/s Loss Coeficient Number Element Gate valve Globe valve 90° elbow T- junction Entrance Strainer 0.25 10 0.9 4 A double-effect positive displacement water pump has a piston diameter (D) of 120 mm and a stroke length (I.) of 240 mm. It is attached to the crankshaft by a piston rod of diameter (d) 30 mm. Output delivery head is 25 m. If the drive motor, connected to the piston by a simple crankshaft assembly, operates at 250 rpm, estimate a. Time required to fill a 400 ton freshwater tank, b Power required by the pump, assuming 75% efficiency 5. -HExplanation / Answer
Total Displacement By Pump (Double Stroke) - A = A1+A2
Total Displacement By Pump (Double Stroke) - A = 0.0195 m3
Total Flow (Q) = Area * Stroke * n
Total Flow (Q) = 0.0195*0.240*250/60 = 0.0195 m3/s
1 Tone = 0.43 m3
400 Tone = 172 m3
Time Required to Fill Tank = Volume / Flow
Time Required to Fill Tank = 172 m3 / 0.0195 m3/s
Time Required to Fill Tank =
8,820/60=147 minuites