Securing A Water Supply

Question 1

What do you do if water does not enter the pump (airlock)?

Answer 1

Open delivery 1 turn. (Reduce revs to make closing delivery easier.

Question 2

When can it be necessary to cool a pump?

Answer 2

When pumping from a hydrant. Cool pump by running some water to ground

Question 3

Why’s closer to the fire ground better when siting the appliance ?

Answer 3

To improve communications, reduce frictional loss

Question 4

What is the strainer called in the pump eye?

Answer 4

Conical

Question 5

What is over-running the water supply?

Answer 5

Allowing the compound gauge to go below 0

Question 6

Why must delivery’s be fully open?

Answer 6

To prevent wear to the valve, and to give an accurate pressure reading

Question 7

Advantages of automatic tank fill?

Answer 7

Variations in pressure don’t affect branch op
Always a reserve of water
More efficient emergency stop

Question 8

Disadvantages to using auto tank fill?

Answer 8

Not possible to take advantage high hydrant pressure
No signal to show if demand exceeds supply capacity
If not on level ground appliance tank fill may be inaccurate

Question 9

Potential causes of low pressure gauge increasing?

Answer 9

Less water being pumped
Branch shut off
Vehicle/debris/kink on hose
Flow rate setting has been reduced

Question 10

Potential causes of LP gauge decrease?

Answer 10

More water being pumped
Branch opened
Flow rate setting increased
Burst length

Question 11

How should you mark an abandoned hydrant?

Answer 11

Blue cross

Question 12

What is Tuberculation?

Answer 12

A build up of deposits such as rust on the inner circumstance of a main

Question 13

What are class A hydrants for ?

Answer 13

General use

Question 14

What are class B hydrants for?

Answer 14

Motorway use

Question 15

What are class C hydrants?

Answer 15

Emergency water supplies

Question 16

What are Class D hydrants?

Answer 16

Meter by pass valves

Question 17

When should a wash out be used and where can it be found?

Answer 17

As a lastresort

In a cup-de-sac

Question 18

How much pressure is lost per metre of suction lift?

Answer 18

0.1

Question 19

LPP practical lift?

Answer 19

6m

Question 20

What is cavitation?

Answer 20

The vaporising of water due to high suction lift or pumping warm water. Creates rattling sound.

Question 21

How can cavitation be stopped?

Answer 21

By reducing revs
Move pump closer to supply( reduce amount of suction)
Move away from warm water source

Question 22

What is the holding pressure of the LPP?

Answer 22

3 Bars

Question 23

What is holding pressure?

Answer 23

Performed by reducing revs to maintain the prime until “water on”command is given.

Question 24

How deep must a suction strainer be?

Answer 24

3 times the suction strainer diameter. To prevent a vortex being formed allowing air into the system.

Question 25

When pumping from open water what causes a decreasing compound gauge?

Answer 25

Rising level of water (tide)

Question 26

When pumping from open water , what causes the compound gauge to increase?

Answer 26

Water supply level falling. (Tide, or running out of supply)

Question 27

How can you make lifting suction hose out of water easier?

Answer 27

Releasing some water at pump eye by loosening coupling.

Question 28

What is water relay?

Answer 28

A number of pumps, spaced out at intervals along the route between the water source fire. Open and closed circuit

Question 29

What is closed circuit relay?

Answer 29

Water is pumped directly into the next ‘booster’ pump.

Question 30

What are the advantages of closed circuit relay?

Answer 30

It’s Quick, requires few resources

Question 31

What are the disadvantages of closed circuit relay?

Answer 31

If a pump breaks down water is lost, chain is broken

Question 32

What is Open circuit relay?

Answer 32

Water is pumped from source into a portable dam, before the booster pumps.

Question 33

What are the advantages of open circuit relay?

Answer 33

There is a reserve of water at each pump should a pump break down there will be less disturbance.

Question 34

What are the disadvantages of open circuit relay?

Answer 34

It requires lots of resources, and takes longer to get water

Question 35

5 hazards when pumping from open water

Answer 35

- steep slippery banks - trip hazards - changing water conditions - waterborne disease - Equipment falling in - Limited visibility at night - Fatigue

Question 36

Why should the pump be flushed twice after pumping from open water?

Answer 36

To prevent sludge and silt build up

Question 37

Two reasons the pump might be receiving low pressure from a supply?

Answer 37

Burst Main/length | Vehicle parked on hose

Question 38

Where are meter by pass hydrants found?

Answer 38

Industrial premises

Question 39

When should the internal strainer be removed from the lpp?

Answer 39

When pumping from open water sources.

Question 40

What happens if you overfill the MAN 12T?

Answer 40

IPC error, knock off incoming water.

Question 41

Advantages of pumping from the appliance tank?

Answer 41

Always have a reserve of water. | Control of delivery pressure

Question 42

How to engage PTO on both appliances?

Answer 42

12T- handbrake/neutral/engine on/PTO/open tank valve. 18T-Handbrake/neutral/engine on/open tank/PTO.

Question 43

Safety considerations with water relay?

Answer 43

``` Noise Fatigue/lone working Fuel supplies Traffic Communication ```