How to read head-flow curves correctly when selecting an irrigation pump?
• Operating point must fall in high-efficiency zone, ≥65%.
• Total head = static lift + pipe loss + outlet pressure.
• Flow = irrigated area × water duty ÷ operating hours.
• Pipe loss about 2-5 m per 100 m; count fittings separately.
• Avoid oversized pump running off-curve, causing cavitation.
• Total head = static lift + pipe loss + outlet pressure.
• Flow = irrigated area × water duty ÷ operating hours.
• Pipe loss about 2-5 m per 100 m; count fittings separately.
• Avoid oversized pump running off-curve, causing cavitation.