Applied Safety Fundamentals, 28% Flashcards
What does the term ‘protection factor’ in respiratory protection describe?
The overall effectiveness of a respirator and the nature of contaminants.
PF = concentration of harmful substances outside the mask / concentration under the mask.
What is safety?
Control of recognized hazards to attain an acceptable level of risk and provide protection from exposure to hazards.
What is loss?
Loss is harm to people, damage to equipment or property, and the destruction of material.
What is risk?
Risk is the chance of loss when exposed to a hazard, including the probability and severity of the loss.
What is an accident?
An occurrence that produce unintended or unplanned loss.
What is an incident?
An incident is an undesired event that results in loss or would have resulted in loss.
What are the 6 main objectives of work inspections?
Document, improve, identify, determine, recommend, monitor
- Documentation
a record of concerns/issues - Improve
increasing understanding of jobs and tasks - Identify
hazard identification - Determine
underlying causes - Recommend
corrective actions - Monitor
steps taken to control hazards/risk
What is SCAT?
Systematic Cause Analysis Technique
- Uses DNV management system model
- Good for major loss or potential for major loss
- systematically links losses to causes & contacts
What is MORT?
Management Oversight and Risk Tree
- Type of fault tree logic diagram
- Describes all phases of a safety program
- Easy to apply and use in large-scale investigations
- Tedious and very time consuming
MORT Tree has three branches:
- Specific control oversights and omissions
- Management system oversights and omissions
- Assumed risks
What is TapRoot?
What is Tripod - Delta Method?
What is the Why Five Technique?
The process of asking why repeatedly until you have a full understanding and all the available information. Typically, this means asking why around 5 times to get to the root cause.
What is ISMEC?
Identification
Standards
Measurements
Evaluation
Commendation and Correction
Management loss control program.
Identify specific program elements or activities to achieve desired results
Establish performance standards
Have a method to measure the work
Evaluate measurements to standards
Commend what is going well while correcting substandard performance.
How do you calculate accident/incident frequency rates and compare to other organizations?
Multiply the number of events by the base rate, then divide by the actual hours worked.
Example:
100 workers, working 40hrs/wk for 50 weeks = 200,000. This is a common base rate.
The employer had 1 incident.
1*200,00 = 200,000
There were only 10 workers, working 40 hrs/wk for 50 weeks. Giving 20,000 actual work hours.
200,000 / 20,000 = 10
The Incident frequency rate is 10 and can be compared to numbers from organizations of different sizes.
How do you calculate accident severity rates and compare to other organizations?
Multiply the number of days lost by the base rate, then divide by the actual hours worked.
Example:
100 workers, working 40hrs/wk for 50 weeks = 200,000. This is a common base rate.
The employer had 10 days lost.
10*200,00 = 2,000,000
There were only 10 workers, working 40 hrs/wk for 50 weeks. Giving 20,000 actual work hours.
2,000,000 / 20,000 = 100
The severity rate is 100 and can be compared to numbers from organizations of different sizes.
What is Material Process Flow Analysis?
A systems approach to measuring the mass of materials entering and leaving a system.
Can be useful in chemical applications to ensure that all emissions and wastes are accounted for.
Define nip points or bites in machine safeguarding.
Nip points or bites are created by two or more mechanical parts rotating in oposite dir
What size of opening in a safety barrier, guarding a mechanical pinch point is acceptable?
Openings should be no wider than 6 mm and no closer than 38 mm from the danger point.
Differentiate simple interlocks with power interlocks.
Simple interlocks stop a machine when the guard is opened.
Power interlocks will not release until the machine has come to a safe stop.
Differentiate type 1 and type 2 hard hats.
Type 1 are for non-lateral impacts
Type 2 are for lateral impacts
What are the three CSA classes of hard hat?
Class G
general use with protection against 2,200V
Class E
electrical use with protection against 20,000V
Class C
no electric protection
Discuss the NRR hearing protection ratings in Canada.
The CSA attenuation data does not match the data required for NRR ratings. Ratings should be reduced to the following:
earplugs - 50%
ear muffs - 70%
dual protection - 65%
NRR = noise reduction rating
What are the two classes of respiratory protection PPE?
Air purifying
Air supplying
How do you determine whether a respirator can be used in a specific concentration of a hazardous substance?
The MUC = TLV x APF
An APF (assigned protection factor) if the level of respiratory protection provided by a respirator.
The MUC (maximum use concentration) is the max concentration of substance that the respirator can be used in.
What a common assigned APF factors for different types of respirator?
Half-face mask: 10 APF
Full-face mask: 100 APF
PAPR: 1,000 APF
SCBA: 10,000 APF
What is a PAPR and SCBA?
context, respiratory protection.
PAPR
powered air purifying respirator
SCBA
self-contained breathing apparatus
What two substances are commonly used in qualitative mask fit testing?
Saccharin and bitrex
Discuss qualitative vs quantitative fit testing.
Qualitative = does the user notice the taste/smell of a substance.
Quantitative = Instrumentation measures air in atmosphere and within respirator for objective measurements.
How is quantitative fit testing usually performed?
A test gas, such as
What daily respirator tests should be performed?
Negative pressure tests (cover inlets and inhale)
Positive pressure test (cover exhalation valve and exhale)
What is current? (electricity)
Equivalent to the volume of water flowing past.
Current (I) is measured in amps (A).
What is voltage? (electricity)
Voltage is equivalent to water pressure.
Voltage (V) is measured in voltage (V).
What is resistance? (electricity)
Resistance (R) is like an obstruction.
Resistance (R) is measured in ohms (Ω)
What is the biggest factor in electrical risk?
Current (I).
The greater the current, the greater the severity.
50mA (0.05A) is sufficient to cause death.
What are common wire colours in an electrical circuit?
Black/red with brass connections = hot wire, provides current.
White with silver connections = neutral, returns current to service panel.
Bare/green = ground, alternative pathway to return current to service panel.
Discuss knife switches in electrical safety.
A knife switch is a simple type of switch using a metal lever to complete a circuit. There is a risk from contacting exposed metal parts, and there is also a risk of arcing.
Most knife switches have now been replaced with safety switches where all conducting parts are covered and cannot be opened without deenergization.
What is a GFCI?
Ground Fault Circuit Interrupter
Monitors current and will break circuit if current changes.
Usually GFCIs trip with a ground fault of 0.005A (1 mA), and trigger within 1/40th of a second.