Millwright Certification Safety Protocols 2 — Questions and Answers

Question 1: What are the key steps in a Lockout/Tagout (LOTO) procedure before performing maintenance?

Just turn off the switch and start working
Notify affected employees, shut down, isolate all energy sources, apply locks and tags, release stored energy, and verify zero energy state before work begins (Correct answer)
Only lock the main breaker
Tag the equipment and start work immediately

Correct answer: Notify affected employees, shut down, isolate all energy sources, apply locks and tags, release stored energy, and verify zero energy state before work begins

LOTO requires a systematic process: notification, shutdown, isolation of all energy sources, application of personal locks and tags, dissipation of stored energy, and verification that the equipment is truly de-energized before any work begins.

LOTO procedure per OSHA 29 CFR 1910.147: prepare by identifying all energy sources, notify all affected employees, shut down using normal operating controls, isolate each energy source, apply personal locks and tags to each isolation point, release stored energy (discharge capacitors, vent pressure, block elevated components, drain piping, release spring tension), and verify by attempting to start the equipment using normal controls and testing with instruments. Only after verification is the equipment safe for maintenance.

Question 2: What is a confined space, and what makes it hazardous for workers?

Any room smaller than 10 square meters
A space large enough to enter but not designed for continuous occupancy, with limited access/egress and potential for hazardous atmosphere, engulfment, or entrapment (Correct answer)
Only underground spaces
Any space with a locked door

Correct answer: A space large enough to enter but not designed for continuous occupancy, with limited access/egress and potential for hazardous atmosphere, engulfment, or entrapment

A confined space has three characteristics: large enough for a worker to enter, not designed for continuous occupancy, and has limited or restricted means of entry or exit. Hazards include toxic/oxygen-deficient atmosphere, engulfment, and entrapment.

OSHA defines a confined space by three criteria: large enough for an employee to enter and perform work, has limited or restricted means of entry or exit, and is not designed for continuous occupancy. Permit-required spaces additionally have hazardous atmosphere, engulfment potential, converging walls, or other serious hazards. Examples include tanks, vessels, silos, hoppers, vaults, pits, manholes, and tunnels. Entry requirements include: entry permit system, atmospheric testing, ventilation, rescue team standby, trained attendant at the opening, and appropriate PPE.

Question 3: What does the GHS pictogram showing a flame over a circle indicate about a chemical?

The chemical is flammable
The chemical is an oxidizer that can intensify fire (Correct answer)
The chemical is explosive
The chemical is a compressed gas

Correct answer: The chemical is an oxidizer that can intensify fire

The flame over a circle GHS pictogram indicates an oxidizer: a chemical that may cause or intensify a fire by providing oxygen, even without an external air supply. Oxidizers make fires burn hotter and faster.

GHS uses standardized pictograms on Safety Data Sheets and labels. The flame over circle (oxidizer) indicates chemicals like hydrogen peroxide, sodium hypochlorite, and potassium permanganate. Oxidizers are dangerous because they provide oxygen to support combustion, intensify burning rates, can cause spontaneous ignition, and react violently with fuels. Storage requirements: separate from flammables and combustibles, use compatible containers, and ensure adequate ventilation.

Question 4: When is fall protection required in an industrial setting, and what are the primary methods?

Only when working above 30 meters
When working at heights of 1.8 meters (6 feet) or more above a lower level in general industry, using guardrails, safety nets, or personal fall arrest systems (Correct answer)
Only when working on ladders
Fall protection is recommended but never required

Correct answer: When working at heights of 1.8 meters (6 feet) or more above a lower level in general industry, using guardrails, safety nets, or personal fall arrest systems

OSHA requires fall protection in general industry at heights of 1.8 meters (6 feet) or more. Primary methods are engineering controls (guardrails, covers), safety nets, and personal fall arrest systems (harness, lanyard, anchor point).

Hierarchy of controls: eliminate the fall hazard (work from ground level), engineering controls (guardrails, hole covers), safety nets, and personal fall arrest systems (full body harness, shock-absorbing lanyard or self-retracting lifeline, and certified anchor point rated for 5,000 lbs per person). Key requirements: maintain fall distance calculation, inspect equipment before each use, and never tie off to non-rated structures. Falls are the number 4 leading cause of workplace fatalities.

Question 5: What is the purpose of a Job Safety Analysis (JSA) before starting a task?

To assign blame if an accident occurs
To systematically identify hazards associated with each step of a task and determine preventive measures before work begins (Correct answer)
To calculate the project cost
To determine how many workers are needed

Correct answer: To systematically identify hazards associated with each step of a task and determine preventive measures before work begins

A JSA breaks a task into individual steps, identifies potential hazards at each step, and prescribes specific preventive measures or controls, ensuring all workers understand the risks and how to mitigate them before work starts.

JSA (also called JHA) is a systematic technique that breaks the job into sequential steps, identifies all potential hazards at each step, determines preventive measures following the hierarchy of controls, and documents the analysis signed by all workers. JSAs should be reviewed when the task changes, an incident occurs, new equipment is introduced, or personnel change. Effective JSAs involve the workers who perform the task.

Question 6: What type of fire extinguisher is appropriate for an electrical fire (Class C)?

Water extinguisher
CO2 or dry chemical extinguisher rated for Class C fires (Correct answer)
Foam extinguisher only
No extinguisher can fight electrical fires

Correct answer: CO2 or dry chemical extinguisher rated for Class C fires

Class C electrical fires require a non-conductive extinguishing agent. CO2 and dry chemical (ABC or BC rated) extinguishers are appropriate because they do not conduct electricity, unlike water or standard foam.

Class C fires involve energized electrical equipment. The first action should be to de-energize the circuit if possible. If the equipment cannot be de-energized: CO2 extinguishers discharge a cloud of cold CO2 gas that displaces oxygen without leaving residue, and dry chemical extinguishers discharge a fine powder that interrupts the chemical chain reaction. Never use water on a Class C fire as it conducts electricity. Halon and clean agent extinguishers are also Class C rated.

Millwright Certification Safety Protocols 2

What are the key steps in a Lockout/Tagout (LOTO) procedure before performing maintenance?