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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?

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
How should showers be sampled for Legionella?
Cover the head with a sterile bag and cut the corner to funnel water into the sample bottle.
26
Bottles for microbiological analysis should contain sodium thiosulphate. Why is this added to the bottles?
To neutralise chlorine or bromine that may be in the sample.
27
Do bottles used for bacterial analysis need to be pre-sterilised?
Yes, always.
28
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?
System should be re-sampled, shot dosed with biocide and the control measures and risk assessment reviewed.
29
At what frequency should dipslide results be taken from a cooling water system?
Weekly
30
What is one possible effect of insufficient biocide dosing into a cooling system?
Micro-biological activity will not be fully under control.
31
How often should a clean and disinfection of a cooling tower be carried out under normal circumstances.
Six Monthly
32
How often should little or unused outlets be flushed?
Weekly
33
How often should showerheads and hoses be cleaned and descaled?
Quarterly
34
What is meant by the term ‘Sentinel Taps’ in a hot water system?
The first and last taps on a recirculating system.
35
How often should sentinel tap temperatures be monitored?
Monthly
36
In addition to sentinel taps how often should intermediate taps be monitored?
Annually on a rotational basis, during monthly visits.
37
When monitoring cold water outlet temperatures, how long should the tap be run for?
2 Minutes.
38
When monitoring hot water outlet temperatures, how long should the tap be run for?
1 Minute.
39
Hot water outlets should reach a minimum of what temperature within the time frame specified in ACOP L8.
50°C
40
Hot Water return temperatures should return at what temperature?
>50oc
41
Which of these components would not normally be removed during a clean of a cooling tower system?
Fan Housing.
42
Prior to carrying out a clean of the cooling water system what task is required to be carried out?
A pre-cleaning disinfection.
43
Why must we always use a bio-dispersant on cooling towers?
To enhance the effectiveness of the clean by breaking down biofilm.
44
What must be done to water containing a high residual of free chlorine prior to being discharged to drain?
It should be de-chlorinated.
45
Which of these chemicals should never be pulled through a drinking water system?
Sodium Thiosulphate.
46
When carrying out a thermal disinfection it is important that the calorifier temperature should be high enough to ensure that …….?
The temperature at the taps and appliances do not fall below 60°C.
47
When using chemicals as part of a water treatment programme, how should chemical drums be stored on site?
In a bund large enough to contain any spillages.
48
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?
To display the appropriate material safety data sheets adjacent to chemicals.
49
If hazards and associated risks cannot be eliminated, what steps would be appropriate to comply with Health and Safety Law?
Implement formal control measures to manage the risk.
50
What is a risk assessment?
An evaluation of all hazards and associated risks to safety.
51
What is a hazard?
Something with the potential to cause harm

Legionella Control (1 decks)

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