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Legionella Control > Necessary Theory - Service Technician > Flashcards

Necessary Theory - Service Technician Flashcards

1
Q

In what year was first outbreak of Legionnaires’ Disease?

A

1976

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2
Q

By what method can an individual contract Legionnaires Disease?

A

Via inhalation of aerosol containing an infectious dose of legionella bacteria.

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3
Q

What is the normal incubation period for Legionella bacteria?

A

2 to 10 days.

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4
Q

Legionnaires Disease can be fatal. What is the approximate percentage of reported cases that result in a fatality?

A

12%

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5
Q

What temperature range allows active growth of legionella bacteria?

A

20ºC - 45ºC

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6
Q

At what temperature is Legionella bacteria most virulent?

A

37°C

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7
Q

At what temperatures can legionella bacteria survive, but not multiply?

A

<20°C

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8
Q

At what temperatures will legionella bacteria be killed within a few minutes?

A

> 60°C

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9
Q

Legionnaire’s disease is?

A

A potentially fatal form of Pneumonia

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10
Q

Legionella bacteria can be found?

A

In man-made and natural water sources

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11
Q

Biofilm (bacterial slime) does what?

A

Provides favourable conditions for the growth of Legionella

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12
Q

Under which Act passed in Parliament does an Employer have responsibility for its employees?

A

Heath and Safety at Work etc. Act 1974

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13
Q

Which approved code of practice and guidance is a legionella risk control based upon?

A

ACOP L8

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14
Q

Who should a duty holder appoint to manage day to day activities for controlling any identified risk from legionella bacteria?

A

A Responsible Person with sufficient status, authority, competence and knowledge.

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15
Q

Cooling Towers & Evaporative Condensers are required to be declared under which Regulation of the Health and Safety at Work Act?

A

Notification of Cooling Towers and Evaporative Condensers Regulations

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16
Q

What is the minimum length of time that records relating to legionella control monitoring, maintenance and inspection should be kept in accordance with ACOP L8?

A

5 years

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17
Q

How does Clearwater ensure compliance with the LCA Code of Conduct?

A

Operates in accordance with the LCA Service Provider Commitments, within the framework of our Statement of Compliance.

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18
Q

In accordance with Water Regulations cold water storage tanks must be?

A

Well insulated and sealed and comprise vermin ingress protected overflows and ventilation ports.

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19
Q

Which of the following must be present on a calorifier?

A

A Drain Point.

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20
Q

What water capacity should a cold water storage tank have?

A

Capacity for 1 day’s usage.

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21
Q

What is the purpose of an anti-stratification pump fitted to a calorifier?

A

To disperse the cold zone below the heating coil and allow the whole calorifier contents to reach 60°C.

22
Q

Cold water storage tanks should be of such design and location to keep stored water temperatures below what level?

A

20°C

23
Q

What does UKAS stand for?

A

United Kingdom Accreditation Service.

24
Q

What type of sample should be taken to obtain water that is representative of the quality within the system?

A

Post flush sample with disinfection of the outlet.

25
Q

How should showers be sampled for Legionella?

A

Cover the head with a sterile bag and cut the corner to funnel water into the sample bottle.

26
Q

Bottles for microbiological analysis should contain sodium thiosulphate. Why is this added to the bottles?

A

To neutralise chlorine or bromine that may be in the sample.

27
Q

Do bottles used for bacterial analysis need to be pre-sterilised?

A

Yes, always.

28
Q

If a legionella sample taken from a cooling system detects more than 1000 colony forming units per litre (cfu/litre), what is the action required?

A

System should be re-sampled, shot dosed with biocide and the control measures and risk assessment reviewed.

29
Q

At what frequency should dipslide results be taken from a cooling water system?

A

Weekly

30
Q

What is one possible effect of insufficient biocide dosing into a cooling system?

A

Micro-biological activity will not be fully under control.

31
Q

How often should a clean and disinfection of a cooling tower be carried out under normal circumstances.

A

Six Monthly

32
Q

How often should little or unused outlets be flushed?

A

Weekly

33
Q

How often should showerheads and hoses be cleaned and descaled?

A

Quarterly

34
Q

What is meant by the term ‘Sentinel Taps’ in a hot water system?

A

The first and last taps on a recirculating system.

35
Q

How often should sentinel tap temperatures be monitored?

A

Monthly

36
Q

In addition to sentinel taps how often should intermediate taps be monitored?

A

Annually on a rotational basis, during monthly visits.

37
Q

When monitoring cold water outlet temperatures, how long should the tap be run for?

A

2 Minutes.

38
Q

When monitoring hot water outlet temperatures, how long should the tap be run for?

A

1 Minute.

39
Q

Hot water outlets should reach a minimum of what temperature within the time frame specified in ACOP L8.

A

50°C

40
Q

Hot Water return temperatures should return at what temperature?

A

> 50oc

41
Q

Which of these components would not normally be removed during a clean of a cooling tower system?

A

Fan Housing.

42
Q

Prior to carrying out a clean of the cooling water system what task is required to be carried out?

A

A pre-cleaning disinfection.

43
Q

Why must we always use a bio-dispersant on cooling towers?

A

To enhance the effectiveness of the clean by breaking down biofilm.

44
Q

What must be done to water containing a high residual of free chlorine prior to being discharged to drain?

A

It should be de-chlorinated.

45
Q

Which of these chemicals should never be pulled through a drinking water system?

A

Sodium Thiosulphate.

46
Q

When carrying out a thermal disinfection it is important that the calorifier temperature should be high enough to ensure that …….?

A

The temperature at the taps and appliances do not fall below 60°C.

47
Q

When using chemicals as part of a water treatment programme, how should chemical drums be stored on site?

A

In a bund large enough to contain any spillages.

48
Q

When chemicals are kept on site as part of the water treatment programme, what Control of Substance Hazardous to Health (COSHH) requirement must be adhered to?

A

To display the appropriate material safety data sheets adjacent to chemicals.

49
Q

If hazards and associated risks cannot be eliminated, what steps would be appropriate to comply with Health and Safety Law?

A

Implement formal control measures to manage the risk.

50
Q

What is a risk assessment?

A

An evaluation of all hazards and associated risks to safety.

51
Q

What is a hazard?

A

Something with the potential to cause harm

Legionella Control (1 decks)

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