BLOCK 4: CHEMICAL CONTROLS - Units 14, 15, & 16 (complete)

Question 1

In accordance with ____________________, personally assigned respirators must be cleaned and disinfected regularly.

Answer 1

29 CFR 1910.134 App. B-2 and AFI 48-137

Question 2

TRUE OR FALSE:

When cleaning respirators, remove all filters, cartridges, and canisters before washing in warm water.

Answer 2

TRUE

Removing all parts is the first step in cleaning/washing the respirators.

Question 3

Respirators issued to individuals for their own exclusive use must be cleaned and disinfected as often as necessary to maintain a sanitary condition. Respirators shared by more than one employee must be cleaned and disinfected before ____________________.

Answer 3

CHANGING USERS

Question 4

Air and oxygen cylinders must be maintained in a fully charged state and shall be recharged when the pressure falls to _____% of the manufacturer’s recommended pressure level.

Answer 4

90%

Question 5

The concentration of the contaminant, as an 8-hr time-weighted average (TWA), divided by the occupational exposure level (OEL). “How many times over the OEL they are exposed to.”

Answer 5

HAZARD RATIO

The units of the TWA and OEL must match so that the hazard ratio has no unit.

An example of a hazard ratio for a process with an 8-hr TWA of 55 mg/m3 for aluminum
metal dust and an OEL of 10 mg/m3.

Question 6

The maximum concentration of a hazardous substance which an employee can expect a respirator to protect against.

OEL X APF = _____

Determines when your chosen equipment would no longer work for future exposure.

Answer 6

MAXIMUM USE CONCENTRATION (MUC)

The MUC is the smallest of these three values:
1.) OEL multiplied by the Assigned Protection Factor (APF)
2.) Immediately Dangerous to Life and Health (IDLH) concentration
3.) Maximum Contaminant Concentration for the given filter or cartridge (which may be
provided by the manufacturer in information included with the filter or cartridge when purchased)

Question 7

active recall

What are some things to consider when selecting respirators?

Answer 7

–> WORKER ACTIVITY
–> RESPIRATOR USE CONDITION
–> LOCATION
–> OPERATIONAL LIMITATIONS
–> IDLH CONDITIONS
–> OTHER ROUTES OF EXPOSURE

Question 8

PROPER SELECTION CONSIDERATIONS

EXAMPLE:
Whether the worker is in the hazardous area continuously or intermittently during the work shift and whether the work rate is considered light, moderate, or heavy.

Answer 8

WORKER ACTIVITY

Question 9

PROPER SELECTION CONSIDERATIONS

The period of time a respirator must be worn is an important factor that should be taken into account when selecting a respirator. Consideration is given to the type of respirator application, such as for routine, non-routine, emergency, or rescue use.

Answer 9

RESPIRATOR USE CONDITION

Question 10

PROPER SELECTION CONSIDERATIONS

This will permit planning for the escape of workers if an emergency occurs, entry of workers to perform maintenance duties, and rescue operations.

Answer 10

LOCATION OF POTENTIAL HAZARDOUS AREA

Question 11

PROPER SELECTION CONSIDERATIONS

Environmental conditions and level of effort required of the respirator wearer may affect respirator service life. For example, extreme physical exertion can cause the user to deplete the air supply in a SCBA unit such that the air is depleted in half the time.

Answer 11

OPERATIONAL LIMITATIONS

Question 12

PROPER SELECTION CONSIDERATIONS

Air-purifying respirators may not be used in IDLH conditions; only atmosphere-supplying respirators may be used. All possible actions, such as increasing ventilation or isolating the source of contaminants, to attain an atmosphere that is not IDLH should be exhausted before authorizing personnel to enter areas known to have IDLH conditions.

Answer 12

IMMEDIATE DANGER TO LIFE OR HEALTH (IDLH) CONDITIONS

Question 13

PROPER SELECTION CONSIDERATIONS

Consider other exposure routes and hazards, such as skin absorption or external radiation, when selecting respiratory protection. Wearing the respirator could increase worker exposure by allowing longer stay times in a hazardous environment.

Answer 13

OTHER ROUTES OF EXPOSURE

Question 14

The ___________________________ is used for determining the appropriate respiratory protection for a process.

Answer 14

RESPIRATOR SELECTION WORKSHEET (AIR FORCE FORM 2773)

There are four parts to the form, which must all be completed in order to determine the appropriate respiratory protection for the worker.

Part 1: Contaminant Classification
Part 2: Warning Properties
Part 3: Special Considerations
Part 4: Respirator Selection

Question 15

PARTS OF THE RESPIRATOR SELECTION WORKSHEET

Details about the contaminant of concern. Specific data about the physical form of the contaminant, the OEL, the concentration during the operation and how the body is affected are all documented here.

Answer 15

Part I - Contaminant Classification

Question 16

PARTS OF THE RESPIRATOR SELECTION WORKSHEET

This section should be completed if considering air-purifying respiratory protection. The odor threshold, whether or not the contaminant causes eye irritation and the sorbent efficiency need to be documented.

Answer 16

Part II - Warning Properties

Question 17

PARTS OF THE RESPIRATOR SELECTION WORKSHEET

This section identifies oxygen content in the work area, specifics about where and how the task is being accomplished, and what PPE, if any, is currently being used.

Answer 17

Part III - Special Considerations

Question 18

PARTS OF THE RESPIRATOR SELECTION WORKSHEET

This section indicates the type of respiratory protection selected. It differentiates between air-purifying or atmosphere supplying.

Answer 18

Part IV - Respirator Selection

Question 19

The level of respiratory protection expected to be provided by a properly functioning respirator.

Answer 19

ASSIGNED PROTECTION FACTOR

The APF must be higher than the Hazard Ratio!