![]() Since real-world pumps are incapable of producing a perfect vacuum, a more realistic limit of 7m or 8 m can be calculated. Why a 7m or 8m real-world limit on suction lift? The 10.34m limit is the point where the weight of the atmosphere “pushing” the water up the hose equals the weight of water in the hose. The pressure differential “raises” or “lifts” the water up the suction hose. The water flows from an area of high pressure to an area of low pressure and a vacuum is created inside the pump. Understanding the difference between the theoretical and actual limit comes from understanding the fundamentals of how an end-suction pump operates.įirstly, pumps don’t “suck” – they produce a vacuum and rely on atmospheric pressure to “push” the water up the suction hose. In reality, the actual limit is 7m or 8m. The reason is that the 10.34m limit assumes perfect conditions: that you’re pumping at sea level, that the pump produces a perfect vacuum, that the water is cold and that there are no friction losses in the suction hose. ![]() However, as simple answers go, it is not quite right. The simple answer is, at least in theoretical terms, 10.34m. When explaining how end-suction pumps work, it is usually in response to the common question “how far up will a pump suck?” ![]()
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