Centrifugal Pumps Design and Application 2nd ed - Val S. Lobanoff, Robert R. Ross (Butterworth-Heinemann, 1992)
NPSH 101 Figure 8-19. Estimating K 2 . Example Ignoring internal leakage back to the impeller, calculate NPSHR cavitation free for the pump now described. • Capacity—1,800 GPM • Product—Water • Temperature—70° F • Speed—8,100 RPM • Impeller eye area—17.2 sq in. • Eye diameter—5 in. • Inlet blade angle—15° • Suction area at A-B—24 sq in.
102 Centrifugal Pumps; Design and Application Figure 8-20. Gas-to-liquid ratio vs. NPSH correction factor, Co (from D. J, Viaming, "A Method of Estimating the Net Positive Suction Head Required by Centrifugal Pumps," ASME 81-WA/FE-32). Step 1: Determine K { , Ratio at A-B = 24/17.2 = 1.4 From Figure 8-18: Step 2: Calculate 0. From Figure 8-9:
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102 <strong>Centrifugal</strong> <strong>Pumps</strong>; <strong>Design</strong> <strong>and</strong> <strong>Application</strong><br />
Figure 8-20. Gas-to-liquid ratio vs. NPSH correction factor, Co (from D. J, Viaming,<br />
"A Method of Estimating the Net Positive Suction Head Requir<strong>ed</strong> by <strong>Centrifugal</strong><br />
<strong>Pumps</strong>," ASME 81-WA/FE-32).<br />
Step 1: Determine K { ,<br />
Ratio at A-B = 24/17.2 = 1.4<br />
From Figure 8-18:<br />
Step 2: Calculate 0.<br />
From Figure 8-9:
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