David V
Mechanical
- Aug 6, 2018
- 1
Hi everyone,
I hope somebody can bring some light over this query.
I have a 24 inches axial flow pump which handles 1 m3/s vs 8 meters of head and I need to design a new one that can handle 0,5 m3/s vs 8 meter. As you can see I need to reduce the flow to the half keeping the head at the same level.
According to the affinity laws, reducing the size of the pump to the 50% the flow will reduce in the same proportion, so far so good. The, the original outside diameter of the pump (24 inches) becomes 12 inches. My problem comes with the head, according to the affinity laws commonly used for centrifugal pumps, the head will be reduced to its 25%, it means 2 meter. I'm not quite sure that this will work with axial flow pumps beacuse there is not necesarily a proportion between the outside diameter of the pump and its head since the head is not based in the centrifugal efect. If I reduce the diameter to the half and keep the vanes shape shouldn't I maintain the head?
Thanks for your time !
David Valladares
I hope somebody can bring some light over this query.
I have a 24 inches axial flow pump which handles 1 m3/s vs 8 meters of head and I need to design a new one that can handle 0,5 m3/s vs 8 meter. As you can see I need to reduce the flow to the half keeping the head at the same level.
According to the affinity laws, reducing the size of the pump to the 50% the flow will reduce in the same proportion, so far so good. The, the original outside diameter of the pump (24 inches) becomes 12 inches. My problem comes with the head, according to the affinity laws commonly used for centrifugal pumps, the head will be reduced to its 25%, it means 2 meter. I'm not quite sure that this will work with axial flow pumps beacuse there is not necesarily a proportion between the outside diameter of the pump and its head since the head is not based in the centrifugal efect. If I reduce the diameter to the half and keep the vanes shape shouldn't I maintain the head?
Thanks for your time !
David Valladares