Water Hammer in Pumping Stations:
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Occurs due to rapid changes in flow when pumps start or stop.
Pumping stations are major contributors to water hammer across industries.
Can be worsened by power failures or uncontrolled shutdowns.
Minimizing Water Hammer:
o Pump Start Methods:
o Direct Online (DOL): Instant start/stop, worst for water hammer.
o Star-Delta Starter: Staged ramp-up, but poor ramp-down.
o Soft Starts & Variable Speed Drives (VSDs): Gradual ramp-up/down,
reducing pressure surges.
Design Considerations:
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Most pump station designs prioritize efficiency over water hammer prevention.
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Water Hammer in Pumping Stations
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Occurs due to rapid changes in flow when pumps start or stop.
Static head vs. running head: If they are close, ramping up/down may not effectively
prevent water hammer.
Pump control valves help regulate flow changes to minimize pressure surges.
Bermad Model 740 Pump Control Valve
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Function: A solenoid-operated valve that ensures gradual flow increase and decrease.
Startup: Opens slowly to introduce water into the pipeline gradually.
Shutdown: Closes at a controlled rate before stopping the pump, preventing sudden
pressure changes.
Additional Features:
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Non-return function eliminates the need for a separate check valve.
Flow control prevents excessive demand from shutting down the pump.
Pressure sustaining keeps the pump operating efficiently.
Installation Considerations
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Removes the need for a secondary check valve to prevent pressure buildup.
Used in various applications, including high-rise buildings, mining, irrigation, and
water supply.
Ensures pump efficiency and prevents cavitation-related wear.
Would you like more details on a specific aspect? You can also check out more information on
the Bermad Model 740 Pump Control Valve.
Installation Considerations



Removes the need for a secondary check valve to prevent pressure buildup.
Used in various applications, including high-rise buildings, mining, irrigation, and
water supply.
Ensures pump efficiency and prevents cavitation-related wear.
Would you like more details on a specific aspect? You can also check out more information on
the Bermad Model 740 Pump Control Valve.
Summary of the Discussion:
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Pump Control Valve Functions:
o Acts as a non-return valve.
o Prevents water hammer by slowly opening and closing.
o Can perform flow control, pressure sustaining, and pressure reduction.
o Versatile and adaptable for installation or future modifications.
Head Loss Considerations:
o Pump efficiency is critical in design.
o Bermad Y-pattern design ensures minimal head loss.
o Proper valve selection prevents the need for larger pumps and motors.
Power Failure Impact:
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Under normal conditions, the valve controls flow effectively.
In uncontrolled conditions (power failure), the valve shuts down.
Water hammer under power failure scenarios will be discussed in a future episode.
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