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Pumps > Securing A Water Supply > Flashcards

Securing A Water Supply Flashcards

1
Q

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

A

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

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2
Q

When can it be necessary to cool a pump?

A

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

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3
Q

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

A

To improve communications, reduce frictional loss

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4
Q

What is the strainer called in the pump eye?

A

Conical

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5
Q

What is over-running the water supply?

A

Allowing the compound gauge to go below 0

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6
Q

Why must delivery’s be fully open?

A

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

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7
Q

Advantages of automatic tank fill?

A

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

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8
Q

Disadvantages to using auto tank fill?

A

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

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9
Q

Potential causes of low pressure gauge increasing?

A

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

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10
Q

Potential causes of LP gauge decrease?

A

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

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11
Q

How should you mark an abandoned hydrant?

A

Blue cross

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12
Q

What is Tuberculation?

A

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

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13
Q

What are class A hydrants for ?

A

General use

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14
Q

What are class B hydrants for?

A

Motorway use

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15
Q

What are class C hydrants?

A

Emergency water supplies

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16
Q

What are Class D hydrants?

A

Meter by pass valves

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17
Q

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

A

As a lastresort

In a cup-de-sac

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18
Q

How much pressure is lost per metre of suction lift?

A

0.1

19
Q

LPP practical lift?

A

6m

20
Q

What is cavitation?

A

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

21
Q

How can cavitation be stopped?

A

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

22
Q

What is the holding pressure of the LPP?

A

3 Bars

23
Q

What is holding pressure?

A

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

24
Q

How deep must a suction strainer be?

A

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

25
Q

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

A

Rising level of water (tide)

26
Q

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

A

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

27
Q

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

A

Releasing some water at pump eye by loosening coupling.

28
Q

What is water relay?

A

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

29
Q

What is closed circuit relay?

A

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

30
Q

What are the advantages of closed circuit relay?

A

It’s Quick, requires few resources

31
Q

What are the disadvantages of closed circuit relay?

A

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

32
Q

What is Open circuit relay?

A

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

33
Q

What are the advantages of open circuit relay?

A

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

34
Q

What are the disadvantages of open circuit relay?

A

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

35
Q

5 hazards when pumping from open water

A
  • steep slippery banks
  • trip hazards
  • changing water conditions
  • waterborne disease
  • Equipment falling in
  • Limited visibility at night
  • Fatigue
36
Q

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

A

To prevent sludge and silt build up

37
Q

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

A

Burst Main/length

Vehicle parked on hose

38
Q

Where are meter by pass hydrants found?

A

Industrial premises

39
Q

When should the internal strainer be removed from the lpp?

A

When pumping from open water sources.

40
Q

What happens if you overfill the MAN 12T?

A

IPC error, knock off incoming water.

41
Q

Advantages of pumping from the appliance tank?

A

Always have a reserve of water.

Control of delivery pressure

42
Q

How to engage PTO on both appliances?

A

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

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

43
Q

Safety considerations with water relay?

A 
Noise
Fatigue/lone working
Fuel supplies
Traffic 
Communication

Pumps (6 decks)

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