Design and Application of Semi-Hermetic Refrigerant Pumps
Design and Application of Semi-Hermetic Refrigerant Pumps (1986)-Usage of hermetic refrigerant pumps is more widespread as they are more understood and better protected. Although some positive displacement pumps are still being used, especially in smaller sizes, they have fallen out of favor due to wear of close fitting parts as the result of abrasive particles or cavitation. Especially as systems have become larger, the trend has been toward centrifugal pumps using double mechanical seals or having hermetic motors. Perhaps the most important element of successful pump operation after achieving adequate suction head is the correct routing and sizing of suction piping to avoid bubble buildup or vapor vortexing into the pump.
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