OIT Chemical Handling and Storage

Question 1

What document must be available to workers for every hazardous chemical used at a water treatment facility?

Accepted Answer

Material Safety Data Sheet (MSDS) or Safety Data Sheet (SDS)

Answer

OSHA's Hazard Communication Standard requires Safety Data Sheets (SDS, formerly MSDS) to be accessible for every hazardous chemical at the workplace.

Question 2

Chlorine gas cylinders stored in a treatment facility should be kept at a temperature below what level to prevent excessive pressure buildup?

Accepted Answer

100°F (38°C)

Answer

Chlorine cylinders should not be stored above 100°F (38°C) because higher temperatures increase vapor pressure and risk of cylinder failure or leaks.

Question 3

When mixing chemicals at a water treatment plant, which of the following is the correct and safe practice?

Accepted Answer

Add acid to water to dissipate heat safely

Answer

Always add acid to water (never water to acid) to safely dissipate the heat generated and prevent a violent exothermic reaction.

Question 4

Which type of Personal Protective Equipment (PPE) is required when handling concentrated sodium hypochlorite solution?

Accepted Answer

Chemical-resistant gloves, face shield, and apron

Answer

Concentrated sodium hypochlorite is corrosive; chemical-resistant gloves, a face shield, and an apron protect against splashes to skin and eyes.

Question 5

How should incompatible chemicals such as chlorine and ammonia be stored at a treatment facility?

Accepted Answer

In separate, well-ventilated storage areas with secondary containment

Answer

Incompatible chemicals must be stored separately with secondary containment to prevent accidental mixing, which could produce toxic gases like chloramines.

(OIT) Operator in Training Practice Test

(OIT) Operator in Training Practice Test

OIT Chemical Handling and Storage