Why Your Double-Suction Pump Isn’t Drawing Water
Release time:
2025-05-22
Author:
Source:
Why Your Double-Suction Pump Isn’t Drawing Water
Main Cause: Pipeline Losses
Double-suction pumps have low suction lift. Excessive pipeline losses can prevent water from reaching the pump.
What Is Pipeline Loss?
1.Friction Loss (Along the pipe):
Caused by liquid rubbing against pipe walls
Influenced by pipe length, diameter, roughness, and flow speed
2.Local Loss (Fittings & valves):
Occurs at elbows, tees, valves, etc.
Depends on the type and number of fittings used
Impact on Pump Performance
1.Reduces Available Head:
More loss = lower effective lift
Example: 50m pump – 10m loss = only 40m usable head
2.Increases Pump Load:
Pump must work harder → more energy used and faster wear
3.Decreases Flow Rate:
Low inlet pressure may cause vacuum → no water drawn in
4.Leads to Cavitation:
Vapor bubbles form, collapse, and damage the impeller
Solutions: How to Fix or Prevent It
1. Optimize Pipe Design:
Shorter pipe runs
Larger diameter pipes
Minimize bends and fittings
2. Use Smooth Pipe Material:
Stainless steel or plastic reduces friction
3.Keep Pipes Clean:
Regular maintenance to remove scale, rust, and debris
4. Add Booster Equipment:
Install a booster pump or pressure tank on the suction side
5. Choose the Right Pump:
Match pump head and flow rate to actual system requirements
Key Takeaway
Poor pipeline design is a major cause of suction failure.
Improving layout, cleaning pipelines, and selecting the right pump can solve the problem, save energy, and extend equipment life.
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