Understanding water pumps

00:03

Water pumps are essential in a water supply network.

00:07

Put simply pumps,

00:08

add energy such as pressure to a fluid generating an increase in head.

00:14

Pumps are generally used for collection from boreholes

00:17

and wells or distribution from a source of

00:19

water like a reservoir tank or contact tank

00:22

or for boosting pressure within a network.

00:25

The most common type of pump and water distribution is a centrifugal pump

00:29

where spinning impellers create rotational kinetic energy

00:32

that is transferred to the liquid.

00:35

Pumps can be characterized by their flow slash head curve.

00:39

Their mechanical or electrical power efficiency

00:41

along this curve and their rotations

00:43

per minute and power drive which can be fixed or varied.

00:48

Pumps can be configured with various complex control schemes but

00:52

typically pumps target a flow outlet pressure or reservoir level.

00:58

A pump curve shows the head a pump generates at a given flow rate.

01:02

Mechanical efficiency can also be included in which

01:05

case it is referred to as a triplet.

01:08

The speed of the pump's ac motor is relative to the power frequency supplied to it.

01:13

By reducing the frequency.

01:15

The pump generates less head at a given flow rate.

01:19

This can be used to make the pump operate

01:21

more efficiently across a wider range of demands.

01:25

These are known as variable speed pumps and

01:27

are not mechanically different from fixed speed pumps.

01:30

With the exception of their power supply.

Video transcript

00:03

Water pumps are essential in a water supply network.

00:07

Put simply pumps,

00:08

add energy such as pressure to a fluid generating an increase in head.

00:14

Pumps are generally used for collection from boreholes

00:17

and wells or distribution from a source of

00:19

water like a reservoir tank or contact tank

00:22

or for boosting pressure within a network.

00:25

The most common type of pump and water distribution is a centrifugal pump

00:29

where spinning impellers create rotational kinetic energy

00:32

that is transferred to the liquid.

00:35

Pumps can be characterized by their flow slash head curve.

00:39

Their mechanical or electrical power efficiency

00:41

along this curve and their rotations

00:43

per minute and power drive which can be fixed or varied.

00:48

Pumps can be configured with various complex control schemes but

00:52

typically pumps target a flow outlet pressure or reservoir level.

00:58

A pump curve shows the head a pump generates at a given flow rate.

01:02

Mechanical efficiency can also be included in which

01:05

case it is referred to as a triplet.

01:08

The speed of the pump's ac motor is relative to the power frequency supplied to it.

01:13

By reducing the frequency.

01:15

The pump generates less head at a given flow rate.

01:19

This can be used to make the pump operate

01:21

more efficiently across a wider range of demands.

01:25

These are known as variable speed pumps and

01:27

are not mechanically different from fixed speed pumps.

01:30

With the exception of their power supply.

Video quiz

In a water supply network, pumps do which of the following?

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A presentation slide outlining the functions of water pumps.

A presentation slide displaying information about pump curves and a graph.

A presentation slide displaying information about variable speed pumps and a graph.

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