Reply to thread

Message: <blockquote data-quote="imhotep" data-source="post: 30320510" data-attributes="member: 562115">What has the foot valve depth got do with? It's the difference of the surface of the water and the pump inlet that matters. The centrifugal pump creates a vacuum, and the water cannot be pumped out to a height greater than 10.3m (approx 33 ft) at sea level. This is the threoretical max height and practically willl be much less.The height from the water surface to the pump is called the suction head. The suction head has to be always less than 33 ft. Otherwise no water will ever come out. The pump will have a spec giving you the Max total Head lift. This is the addition of the suction head and the discharge head.If your pump has a total head lift of 85 ft, and say your suction head is 25 feet then you have a discharge head of 60 ft (85 - 25)Also this doesn't mean that you can lift it to 60ft. Every pump has a curve that gives the discharge rate (liters or gallons /min) against the Total Head. You need to operate the pump somewhere in the middle of the curve. The discharge rate falls rapidly at high total head values.</blockquote>

Top Bottom