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Abusing Affinity

By
Tom Walski

The current technology for converting a constant speed pump into a variable speed pump is a variable frequency drive (VFD)....

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Finding Closed Valves (Before They Find You)

By
Tom Walski

Isolation valves are an essential part of water distribution systems. Without them, a single pipe break can shut down an...

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When Tractive Stress Design Breaks Down

By
Tom Walski

The concepts of tractive force design for sewers have been around for a long time. (Actually, the term “tractive force”...

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What’s the Right Velocity for Flushing?

By
Tom Walski

Flushing water mains is one of the accepted methods for cleaning a water main and reduce water quality complaints due...

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Where Did this Equation for Hydrant Flow Test Results Come From?

By
Tom Walski

Those of you who work with water distribution systems generally need to determine the flow that can be delivered to...

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Which Head Loss Equation is Right?

By
Tom Walski

In order to do any kind of hydraulic modeling, whether it is for water distribution, sewage or stormwater, it is...

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Modeling Complicated Controls in Water Systems

By
Tom Walski

Modeling pump status or speed or valve position is generally pretty straightforward in most automatically controlled systems.

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Premise Plumbing

By
Tom Walski

Pressure and water quality could deteriorate in the customer’s plumbing system. The problem has become more acute with regard to...

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Why District Metered Areas?

By
Tom Walski

Water utilities everywhere struggle to reduce real water loss using a variety of tools from acoustic leak detection, to water...

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