Understanding leakage, flushing, and cavitation

00:03

When working with a network model in WS pro

00:06

it is important to be aware of leakage. Flushing and cavitation

00:11

leakage refers to a specific type of unaccounted for water presumed lost

00:15

to distribution losses such as from leaks in pipework or fittings,

00:21

leakage can be estimated from flow data and

00:23

located using acoustics such as acoustic data loggers.

00:28

It is also possible to locate leakage from pressure monitoring.

00:31

Given a sufficiently accurate network model.

00:34

Understanding leakage is important to allocating demand in network models.

00:39

Estimating leakage requires estimating or knowing the net flow within an area.

00:44

The estimated legitimate night time usage per property and

00:47

any known or predicted exceptional demand such as factories.

00:52

Another important consideration of a network model is mains flushing.

00:56

A common practice that involves discharging flow through a hydrant.

01:00

Maine's flushing increases velocity and sheer stress

01:03

in a pipe to dislodge sediment.

01:06

This practice often requires networks to be partially isolated to

01:10

endure unidirectional flow in the pipe to maximize velocity.

01:14

Another concept to consider is cavitation,

01:17

the rapid formation and collapse of air pockets in liquid.

01:21

The collapse causes shockwaves that create a

01:23

distinctive sound and can damage equipment.

01:27

The cause of cavitation is a drop in pressure below vapor pressure when fluid

01:31

cannot move fast enough through a mechanism typically through a pump or valve.

01:36

Although it is not usually considered in network modeling.

01:39

Understanding,

01:40

cavitation is crucial during the investigation of control valves,

01:43

pumps and even pipes in some conditions.

Video transcript

00:03

When working with a network model in WS pro

00:06

it is important to be aware of leakage. Flushing and cavitation

00:11

leakage refers to a specific type of unaccounted for water presumed lost

00:15

to distribution losses such as from leaks in pipework or fittings,

00:21

leakage can be estimated from flow data and

00:23

located using acoustics such as acoustic data loggers.

00:28

It is also possible to locate leakage from pressure monitoring.

00:31

Given a sufficiently accurate network model.

00:34

Understanding leakage is important to allocating demand in network models.

00:39

Estimating leakage requires estimating or knowing the net flow within an area.

00:44

The estimated legitimate night time usage per property and

00:47

any known or predicted exceptional demand such as factories.

00:52

Another important consideration of a network model is mains flushing.

00:56

A common practice that involves discharging flow through a hydrant.

01:00

Maine's flushing increases velocity and sheer stress

01:03

in a pipe to dislodge sediment.

01:06

This practice often requires networks to be partially isolated to

01:10

endure unidirectional flow in the pipe to maximize velocity.

01:14

Another concept to consider is cavitation,

01:17

the rapid formation and collapse of air pockets in liquid.

01:21

The collapse causes shockwaves that create a

01:23

distinctive sound and can damage equipment.

01:27

The cause of cavitation is a drop in pressure below vapor pressure when fluid

01:31

cannot move fast enough through a mechanism typically through a pump or valve.

01:36

Although it is not usually considered in network modeling.

01:39

Understanding,

01:40

cavitation is crucial during the investigation of control valves,

01:43

pumps and even pipes in some conditions.

Video quiz

In a water supply network, leakage refers to which of the following?

(Select one)
Select an answer

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When working with a network model in InfoWorks WS Pro, it is important to be aware of leakage, flushing, and cavitation.

A presentation slide displaying information about estimating leakage and a Daily Usage Pattern graph.

A presentation slide displaying information about mains flushing.

A presentation slide displaying information about cavitation.

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