Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Unit B > B3 Ollie > Flashcards

B3 Ollie Flashcards

1
Q

Ventilation

A

General Dilution Ventilation :
The introduction of fresh air in order to dilute airborne contaminants to a safe level
Local Exhaust Ventilation :
A system of removing contaminated air close to the point of production

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

General Dilution Ventilation

A 
Natural ventilation:
Flow of fresh air
Mechanical/force d ventilation:
Mechanical supply needed to:
Provide oxygen for breathing
Remove excess heat
Dilute and remove odour
Dilute and remove workplace contaminants (harmful to health and flammable)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Dilution Ventilation (1)

A 
Low toxicity
Multiple s ources
Low concentrations
Steady and low rate of release
Workers are positioned at 90 degrees to airflow Must not interfere with airflow to LEV systems
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Dilution Ventilation (2)

A

Must control exposure to below the WEL
Must maintain flammable sources to 10% of the LEL Not practicable to extract at source
Not dust
Heat loss not a problem

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Dilution Ventilation - Advantages

A

Advantages:
Quick and simple
Cheap to install and run Few moving parts to service Failures are obvious

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Dilution Ventilation - Dis-advantages

A 
Disadvantages:
Causes uncomfortable draughts
Air flow may be uncontrolled
Positive pressurisation may occur
Only suitable for nuisance contaminants Benefit is not universal
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Dilution Ventilation -Design

A

Rate of emission of chemical contaminant
Size of the workroom
General ventilation rates (8-36l/s ec/occupant) Seas onal changes
Poor mixing/airflow/pockets of stagnation Workers located downstream of contaminant Maintenance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

LEV - Design

A

The size,shape and position of the source
The physical nature of the contaminant
The speed and direction of the contaminant
The rate of generation of the contaminant
The nature of the operation which generates the contaminant The position of the plant or machine operator
Local air movement due to general ventilation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Types of LEV Hood

A 
Enclos ing (Partial/full enclosure)
Receiving (Receptor hoods – canopy hoods and others ) Capturing (Captor hoods)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Receptor Hoods

A

Be big enough to receive the contaminant Emptied as fas t as it’s filled
As near to the process and source as possible As enclosing as possible
Shielded from draughts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Captor Hoods

A

Fixed, movable, low volume high velocity (LVHV)
Hood has to generate sufficient airflow at and around the source to capture and draw in the contaminant-laden air
Capture velocity:
Air velocity required to capture contaminant
Face velocity:
Air velocity at face of hood
Capture zone:
Area around hood where air velocity is sufficient

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Capture Hoods - Maximising Performance

A

Maximise enclosure
Hood design - flanges
Capture zone must include working zone Training of operatives
Testing/trying using smoke tubes and pellets

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Ductwork

A

Airflow (duct velocity) sufficient to keep particles
suspended Robust
Changes in direction kept to a minimum
Smooth junctions
Access points for cleaning May be flexible
Airflow must be balanced

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Air Cleaners

A

Air filters (HEPA High Efficiency Particulate Air) Particulate dust and fume collectors
Devices to remove mists , gas es and vapours Needed because:
Harmful nature of contaminants Air recirculation Environmental considerations

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Bag Filters

A

Fabric filter with shaker Hole in filter
Wrong filter
Shaker failure
Wet material

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Electrostatic Precipitator

A

Very effective on oil must Potential for fires

Casing prone to corrosion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Fans -General

A

Centrifugal or axial
Selectiondepends on:
Airflow Resistance Contaminant Space Flammability Noise

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Fans - Centrifugal

A

Good for high resistance

Often used for smaller volumes Backward curved blades are better

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Fans -Axial

A

Cased axial
Belt driven axial
Bifurcated axial (least efficient but useful for flammable and corrosive materials)
Good for high volume low resistance air movement as in general ventilation.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Flue/Stack

A

Sufficient dis tance from air inlet
Design to avoid entry of water/vermin
Environmental cons iderations
Standards of emissions s et by Environment Agency/Local Authority Permit maybe required under The Environmental Permitting Regulations /Pollution Prevention and Control Regulations

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Monitoring and Maintenance of Controls - COSHH Regulation 9

A

Plant and equipment in good repair, efficient state LEV every 14 months

22
Q

Monitoring and Maintenance of Control Measures - LEV Requirements

A 
LEV every 14 months
Weekly check (ACOP):
Ensure LEVis always on
Observe condition of booth
Observe visible ducting/dampers
Observe evidence of failure e.g. odour, deposits 
Observe any pressure/flow device
Undertake minor service work e.g. filter bins Records
23
Q

Monitoring and Maintenance of Control Measures - Thorough Examination and Test

A

Examiner s hould refer to:
LEV system commissioning report
The LEV us er manual
The log book for the system
The previous LEV s ys tem s tatutory report
Confirmation that there have been no changes to the LEV, layout or process since the last test

24
Q

Thorough Examination and Test - Stages

A

Stage 1:
A thorough visual examination to verify the LEV is in efficient working order, in good repair and in a clean condition

Stage 2:
Measuring and examining the technical performance to check conformity with commissioning data

Stage 3:
Assessment to check the control of worker exposure
is adequate

25
Q

Pitot Static Tubes -PressureTest

A

Glass /steel tubes consisting of two concentric tubes
Positioned in ductwork facing direction of airflow
The device deduces the airs peed by measuring the pressure rise (velocity pressure) caused by the airflow
Pressure exerted at holes in sides of the tube can be used to measure static pressure

26
Q

Rotating Vane Anemometer - Face Velocities

A

Connected to meter
Lose precision below 0.25m/s
Some intrinsically safe
Do not touch vanes
Not suitable for ducts or narrow openings
Several readings taken at hood face and average taken

27
Q

Hot Wire Anemometer - Face Velocities

A

As the air moves over the heated wire, the wire cools
The amount of cooling is proportional to the airs peed, and this is calculated electronically
No use in flammable atmospheres
Require regular calibration
Windshield must be exactly aligned with airflow

28
Q

Assess Control Effectiveness

A

Challenge tests with smoke with the process running, to check for
smoke leakage, eddying and breathing zone encroachment
Dust lamp tests with the process running to check for escape of dust or mist
Observation of the way operators work,whether they are using the methods specified and whether these methods are sustainable

29
Q

Test Records

A

Name and address of employer Identification of LEV and process Date of last test
Test conditions
LEV design performance Method of test Equipment used
Date of test
Name and signature of tester Details of any necessary repairs Kept for 5years

30
Q

Selection of PPE (1)

A

Nature of the hazard
Duration and frequency of use Other risks from work activity Compatibility
Ergonomic considerations Communication requirements Maintenance and storage Training required

31
Q

Selection of PPE (2)

A 
Fit and comfort
Pers onal choice/employee acceptance Ethnic/religious considerations
Pers onal fitnes s levels
Durability of the PPE
Cost
British standards (BCE markings)
32
Q

Personal Protective Equipment at Work Regulations 1992 - Requirements

A

Application
Provision of PPE
Compatibility
Assessment
Maintenance and replacement Accommodation
Information, Instruction and Training Use of PPE
Reporting Loss or Defect

33
Q

Protection

A 
Solid particles Chemical splash Gases and vapours Molten metal
Non ionising radiations Glare
Spectacles
Goggles
Face shields
34
Q

Hand Protection

A 
Cuts and abrasions 
Temperature
Vibration
Irritation and dermatitis 
Toxic and corrosives
35
Q

Hand Protection - Types

A

Natural rubber:
Not suitable for solvents , strong acids or alkali

Nitrile:
Not suitable for strong acids or alkali

Neoprene:
Can be used for strong alkali

36
Q

Hand Protection - Considerations

A

Factors to consider:
Breakthrough times
Penetration
Degradation

Possible problems: 
Sensitisation
 Sweating
Lack of touch 
Lack of dexterity
37
Q

Barrier Creams

A

Limited protection and information available
Workers may not apply them properly, leaving part of their skin uncovered
Variation in application
Protection may be removed while working without workers noticing Suncream

38
Q

Whole Body Protection

A

Low risk - lab coats
Chemical
High visibility Mechanical - kevlar
Temperature

39
Q

Respiratory Protective Equipment - Considerations

A 
Oxygen level 
Substances present 
Hazardous effects
 Form
Concentration
WELs
Additional hazards
Length of wear
 Decontamination
 Face fit
40
Q

Assigned Protection Factor (APF)

A

Concentration of contaminant outside face-piece divided by Concentration of contaminant inside face-piece:
Simple ratios o no units
Level of respiratory protection that can realistically be achieved by 95% of trained wearers
Based on survey of 10samples in lab
Gives measure of efficiency of RPE Higher the RPE, better efficiency

41
Q

Minimum Protection Required (MPR)

A

Concentration of contaminant outside face-piece divided by the prescribed WEL
WEL is maximum allowed
In practice give allowance of twice the MPR

42
Q

Types of RPE

A

Respirators
Filter contaminated air - not suitable for oxygen deficient atmospheres
Breathing apparatus
Independent air supply

43
Q

Types of RPE-Respirators

A

Filtering face-pieces
Half-mask respirators with replaceable filters Full-face mask respirator with replaceable filters
Power assisted respirators with replaceable filters

44
Q

Filtering Face-pieces

A

Particles and aerosols Standard: EN149: 2001
FFP1 – APF of 4
FFP2 – APF of 10
FFP3 – APF of 20

45
Q

Particle Filters

A

Particle filters not suitable for gas es Marked P1,P2,P3 – white in colour
P1 low efficiency/P3 high efficiency TH for powered
respirators
TM for hoods
Change daily/hard to breathe through/damage Expiry dates

46
Q

Gas/VapourFilters

A

Class 1(lowcapacity)toClass 3(highcapacity)
Colour coded for different substances e.g. inorganic gases and vapours – grey
Also marked for powered respirators (THor TM)
Change filters as instructed by the manufacturer, e.g.
single us e only or 50 hours /damaged/contaminant
tested
Generally gas filters last longer than particle filters
Expiry dates

47
Q

Combined Filters

A

Markings for particles and vapours e.g. A2P3 — organic vapour filter with capacity class 2 and high efficiency particle filter

48
Q

RPE - APF Values

A 
Filtering Facepiece: 4-20
Half Mask:4-20
Full Face Mask:4-40
Air fedvisor:10-40
Compressed airline mask: 10-100 
SC Breathing Apparatus : 40-2000
49
Q

Breathing Apparatus

A 
Separateair supply
Fresh air hoses
Compressed air line
Self-contained breathing apparatus (SCBA) Escape
sets
50
Q

Face Fit

A

Filtering face-piece – qualitative
Half masks , full face masks – quantitative
Testing required by COSHH/CLAW/CAW ACOPs
Qualitative test – taste
Not needed for hoods /helmets /visor/blouses

51
Q

Face Fit - Quantitative

A

Particle counting tes t (e.g. Portacount Plus ) Negative pressure device

Numerical value: required
Full facemasks:2000
Half masks:100
Filtering facepieces:100
Competence: Fit 2Fit RPE Fit Tes tProviders Accreditation Scheme
52
Q

RPE - Inspection and Maintenance

A

COSHH Reg 8:
Test at suitable intervals
Thorough examination normally once per month
At least once every three months
Visual examination all parts - straps , face pieces , filters
Records kept; 5 years
Air quality BA every three months

Unit B (20 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions