Confined Space Safety Procedures

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Questions and Answers

Which class of fire is most suitable for extinguishing petrol fires?

Class C

Class A

Class D

Class B (correct)

What type of fire extinguisher is NOT suitable for Class D fires?

Water (correct)

CO2 (correct)

Dry Chemical Powder (correct)

Special extinguishing agents

What is the primary extinguishing principle used when removing air or oxygen from a fire?

Inhibiting the Flame Chain Reaction

Cooling

Smothering (correct)

Starving

Which class of fire extinguisher is most suitable for energized electrical equipment?

CO2 Signup and view all the answers

What does the fire extinguishing principle of 'starving' involve?

Eliminating the fuel source Signup and view all the answers

Which class of fire involves metal fires, such as sodium and potassium?

Class D Signup and view all the answers

Which extinguishing method involves cooling the fuel below its ignition point?

Cooling Signup and view all the answers

Which of the following is correct regarding Dry Chemical Powder extinguishers?

They can be used to inhibit flame chain reactions. Signup and view all the answers

What is the minimum height that mandates the use of fall protection?

6 Mtr. Signup and view all the answers

Which of the following is NOT a fall protection system?

Dust mask Signup and view all the answers

In what situation is a chin strap for a helmet compulsory?

High windy times Signup and view all the answers

What is a key criterion for selecting respirators?

Physical, chemical & toxic properties of the atmosphere Signup and view all the answers

What does SCBA stand for?

Self Contained Breathing Apparatus Signup and view all the answers

What is the typical duration rating for SCBA?

3 Minutes to 60 Minutes Signup and view all the answers

Which of the following hazards is associated with hand grinding work?

Eye injuries due to flying particles Signup and view all the answers

Can air purifying respirators be used in oxygen deficient atmospheres?

No, they cannot supply additional air Signup and view all the answers

What must workers do while in a man basket during lifting operations?

Wear a personal fall arrest system and helmet with chin strap Signup and view all the answers

What should be confirmed once a load is raised a few inches?

The load is securely slung Signup and view all the answers

Which of the following is NOT a safety precaution during lifting operations?

Drag the load with the crane Signup and view all the answers

What is the role of the fire extinguisher during lifting operations?

It must be of an approved type and capacity Signup and view all the answers

What happens if lifting equipment is overloaded?

Lifting equipment may collapse Signup and view all the answers

How should slings be protected from sharp edges?

By using suitable packing Signup and view all the answers

Which item must be prominently displayed in the crane cabin?

Calibrated SWL indicator and crane capacity chart Signup and view all the answers

What condition of wire rope slings makes them unsafe for use?

They are kinked, crushed, frayed or corroded Signup and view all the answers

What is the first step that should be taken before starting any hot work?

Obtain a valid hot work permit Signup and view all the answers

Which of the following is NOT a precaution to take during welding or hot work?

Keeping combustible materials near the hot work area Signup and view all the answers

What type of safety device should be used with welding machines?

Ground Fault Circuit Interrupter (GFCI) Signup and view all the answers

Why is it essential to wet the area with water before starting hot work?

To reduce the risk of fire Signup and view all the answers

What should be in good working condition before conducting gas welding or cutting?

Cylinders and regulators Signup and view all the answers

What device is required to prevent flashbacks in gas welding operations?

Flash back arrestors Signup and view all the answers

What aspect should be checked frequently around the hot work area?

Gas leaks and flammable atmosphere Signup and view all the answers

What is the purpose of covering the welding point with a fire blanket?

To protect against sparks and heat Signup and view all the answers

What type of equipment is allowed to be used inside a confined space?

Explosion-proof equipment Signup and view all the answers

What should be done if an emergency occurs within the confined space?

Notify the emergency rescue team without entering Signup and view all the answers

What is the maximum voltage allowed for lighting and tools used inside confined spaces?

24 volts Signup and view all the answers

Which of the following best describes a confined space?

An enclosed space with limited means of entry and exit that is not meant for continuous occupancy Signup and view all the answers

What should be monitored to ensure safety before entry into a confined space?

Gas levels and air quality Signup and view all the answers

What is a critical safety measure when preparing to enter a confined space?

Conducting a pre-task meeting and obtaining signatures Signup and view all the answers

What is the primary characteristic of H2S gas?

It smells like rotten eggs at low concentrations Signup and view all the answers

What must be done to protect the area before entering a confined space?

Barricade the area with warning signs Signup and view all the answers

Study Notes

Confined Space Entry

Entrants must wear a body harness and attach a lifeline when necessary to enable rescue.
Lighting should not exceed 24 volts and must utilize a Ground Fault Circuit Interrupter (GFCI).
Only intrinsically safe or explosion-proof equipment is permitted within confined spaces.
Emergency rescue teams may be placed on standby, and entry should not occur during emergencies until a rescue team arrives.
The area must be marked with warning signs to prevent unauthorized access.

H2S (Hydrogen Sulfide)

H2S is produced from the decomposition of organic materials and is highly toxic and flammable.
It has a distinct rotten egg odor at low concentrations but becomes odorless at high concentrations.

Fire Extinguishers

Different fire extinguishers are designed for specific classes of fire (A, B, C, D, E).
Class A fires involve carbon-based materials (wood, paper) and all types of extinguishers can be used.
Class B fires involve flammable liquids; suitable extinguishers are CO2 and Dry Chemical Powder.
Class C fires involve gases (e.g., propane) suitable for CO2 and Dry Chemical Powder extinguishers.
Class D fires (metals) require special extinguishing agents.
Class E fires, involving energized electrical equipment, can utilize specific types like CO2 and Dry Chemical.

Fire Extinguishment Principles

Starving: Removing fuel to prevent burning (e.g., turning off valves).
Smothering: Removing air or oxygen (using blankets, foams, or sand).
Cooling: Reducing temperature to below ignition point (using water spray).
Inhibiting: Arresting the chemical chain reaction, often with Dry Chemical extinguishers.

Safety Precautions for Hot Work

Begin with a valid hot work permit; cover the welding point with fire blankets when in a refinery.
Carry out frequent gas tests to monitor for hazardous atmospheres.
Wet the area and keep a pressurized firewater hose nearby; remove combustible materials.
Ensure a certified fire watcher is present, and inspect equipment before use.
Use GFCI connections for electrical equipment and properly ground all machines.

Safety in Gas Welding & Cutting

Issue a valid hot work permit and conduct frequent gas tests.
Use specially designed lighters for igniting oxyacetylene flames.
Ensure regulators and gauges are in good condition; close cylinder valves before removal of regulators.
Install flashback arrestors on hoses to prevent backfire.
Provide adequate ventilation in confined spaces to expel toxic fumes.

Lifting Operations Safety

Ensure the load is clear and securely slung; double-check security once raised.
Avoid moving under a suspended load and barricade the swing radius of the crane.
Daily inspections of lifting equipment are essential; keep necessary firefighting equipment nearby.
Prohibit tying knots in slings and ensure they are free of damage.

Fall Protection Requirements

Fall protection is mandatory at heights of 1.8 meters (6 feet) or higher.
Systems include safety belts, harnesses, lifelines, safety nets, and guardrails.

Personal Protective Equipment (PPE)

Life jackets are required for personnel working near or above water.
Respirators should be selected based on atmospheric conditions, type of contaminants, TLV, and IDLH concentrations.

Self Contained Breathing Apparatus (SCBA)

Comprises a compressed air cylinder, full face piece, air supply hose, pressure regulator, low-pressure alarm, and pressure gauge.
SCBA provides clean air in hazardous conditions for a duration of 3 to 60 minutes.

Hazards During Hand Grinding

Potential eye injuries from flying particles and risks of electric shock.
Wheel bursting and clothing catching are significant safety concerns.

PPE for Fabrication Work

Use appropriate personal protective equipment tailored to the specific tasks and hazards involved in the fabrication process.

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Description

This quiz focuses on the safety procedures and equipment required for working in confined spaces. It covers the use of body harnesses, lighting standards, and the importance of standby rescue teams in emergency situations. Understanding these protocols is crucial for ensuring safety and compliance in hazardous environments.