D2 Water Hammer

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The magnitude of water hammer is dependent on what 3 factors?

1) change in flowing velocity 2) liquid density 3) sounds speed in the liquid and piping system

What are a few (3) other names for water hammer?

1) hydraulic transient 2) surge 3) shock

Any change in what can create water hammer?

steady state conditions

What are designed to control rapid velocity changes which may cause potentially dangerous pressure surges?

surge arrestors

What is water hammer?

the sound like someone hammering on a pipe that occurs when a valve is opened or closed very rapidly

How do surge arrestors work?

they use a vessel charged with air or gas and connect it to the pipeline, so that it can convert the kinetic energy of the moving liquid into stored potential energy

How does water hammer occur?

when a valve position is changed too quickly the water pressure in a pipe will increase and decrease back and forth very quickly, which can cause serious damage to the system

To prevent water hammer what precautions must be taken when using large pumps?

when large pumps are put on line or taken off line they will have the ability to create water hammer, so great care must be taken to ensure that pressures do not surge


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