Workplace Exposure Limit Flashcards
What are the two time periods a WEL can be measured in?
Long term ( 8 hours )
Short term (15 minutes)
Where can the approved list of WEL’s be found?
EH40 guidance notes
What are examples of substances with a WEL?
Solvents
Metals
Dust
Acids
Halogens
Pesticides
Herbicides
Toxins
Carcinogens
Mutagens
Respiratory irritants
Asphyxiants
Skin sensitisers
Narcotics
Corrosives
Flammables
What is the calculation method for long term WEL?
(C1xT1)+(C2+T2)
_________________
8
C = Occupational exposure
T = exposure time in hours
Example
(0.12×7.33) + (0×0.67)
______________________
8
0.67 represents 40 minutes of no exposure
What actions can be taken if a WEL is exceeded?
Check control measures
Ensure good practice is applied
Consider use of PPE
Devise and implement immediate action programme to reinforce control measures
Further measurements to ensure remedial action taken has been effective
Examples of substances that pose an immediate danger to life?
Carbon dioxide
Ethanol(found in alcohol beverages)
Carbon monoxide
Acetic acid(vinegar)
Chlorine(used in chemical weapons)
What limits must exposure not exceed?
30 minutes above the WEL in any one day
3 times the WEL limit
The short term exposure limit must not
Exceed the WEL for more than 15 minutes
Be more than 4 times a day
Have less than 60 minutes between exposures
Which regulation of COSHH sets out requirements for carcinogenic and mutagenic substances?
Regulation 7
What measures should be put in place where it is not reasonably practicable.to prevent exposure to a carcinogenic substance?
Total enclosure of process
Prohibition of eating, drinking and smoking in areas that may be contaminated with carcinogens
Regular cleaning of floors walls and surfaces
Using suitable and sufficient warning signs
Safe storage, handling and disposal of carcinogens including using labelled containers
