Low irrigation pressure

9 years ago

I am trying to help an 84 year old gentleman with the irrigation system for his large garden. It has a Myers QP15 1 1/2 HP pump and could only run one sprinkler at a time. I cleaned the point with acid and now it will run 5 sprinkler heads but the pressure will never go above 10 PSI. Even if I shut off sprinklers one at a time untill there is no sprinklers running, the pressure never goes above 10 PSI. I took apart the pump and found that the impeller is 5 inches in diameter and the housing is 5 1/2 inches in diameter...leaving 1/4 inch clearance on each side of the impeller. Is that too large to get more than 10 PSI or do I ave other problems? There seems to be no air bubbles in the water so I don't think I have an air leak in the intake. Please help before I have to call an irrigation company...which he cannot afford. Thanks mmisch

Comment (1)

lehua49
9 years ago
mm,
Is the 10 psi a change from before? Do you have a pump maintenance manual? can you find the manual on-line? Find out what the specifications for the impeller replacement is? If that is the original impeller with no damage, I doubt that is the problem. Check the flow versus pressure curve for the pump. Also critical is how much the pump has to lift the water from the well. I recommend a well guy come an look and give a price to investigate that meets your budget and you do all the work recommended by the investigator.
You probably have a leaking the part that lifts the water out of the well resulting in pressure loss before reaching the pump. You would end up replacing the in well part with new .
GL and Aloha
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