WIT-04

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Questions and Answers

What must be used if exposure would exceed permissible limits with available ventilation?

Protective gloves

Dark filter plates

Welding helmets

Suitable respiratory protection (correct)

What must be done to prevent inadvertent operation and injury when repairing machinery by welding or brazing?

Increase ventilation in the area

Install additional safety devices on the machinery

Disconnect the power, lock out, try, and tag the machinery (correct)

Provide extra welding helmets for personnel

What is the single most important factor influencing exposure to fumes?

Duration of the welding process

Type of welding equipment used

Position of the welder’s head with respect to the fumes plume (correct)

Temperature of the welding area

What must rotating and automatic welding machines, fixtures, and welding robots be equipped with?

Appropriate guards or sensing devices Signup and view all the answers

What must be ensured by ventilation in confined spaces?

Adequate oxygen for life support and prevention of oxygen-enriched atmosphere and flammable mixtures Signup and view all the answers

What can result from asphyxiation in confined spaces?

Unconsciousness and death without warning Signup and view all the answers

Where may lighter-than-air gases accumulate in confined spaces?

Tank tops, high areas, and near ceilings Signup and view all the answers

What concentration of oxygen-enriched atmospheres is considered hazardous?

Above 25% Signup and view all the answers

How should confined spaces be tested before entry?

For toxic or flammable gases and vapors and adequate oxygen Signup and view all the answers

What must be used when proper ventilation cannot be provided in confined areas where welding or cutting processes are carried out?

Positive pressure self-contained breathing apparatus Signup and view all the answers

What presents special hazards when welding or cutting outside or inside containers and vessels that have held dangerous substances?

Flammable or toxic vapors potentially present Signup and view all the answers

What precautions must be observed when welding or cutting inside vessels that have held dangerous materials?

The precautions for confined spaces Signup and view all the answers

What must be prevented inside containers during welding?

Pressure buildup Signup and view all the answers

Which specifications must be followed for cylinders used in welding and cutting operations?

U.S. Department of Transportation (DOT) specifications Signup and view all the answers

What should welders be trained to do to avoid high exposure levels?

Keep their head to one side of the fume plume Signup and view all the answers

Where can pinch points on welding and mechanical equipment result in injury?

Fingers and hands Signup and view all the answers

What has a significant influence on fume amounts and welder’s exposure?

Ventilation Signup and view all the answers

Why is adequate ventilation necessary in welding?

To keep welder’s exposure to fumes and gases within safe limits Signup and view all the answers

What must be prevented during welding, brazing, and cutting?

Overexposure to fumes and gases Signup and view all the answers

What do background fume levels depend on?

The number and type of welding stations and the duty cycle for each power source Signup and view all the answers

In which type of welding are fumes and gases usually a greater concern?

Arc welding Signup and view all the answers

What influences fume components and the amount generated in welding?

The type of base metal being welded Signup and view all the answers

What may contribute significantly to the hazard potential of the fume in welding?

Surface contaminants or coatings Signup and view all the answers

What methods of ventilation are available for welding?

Natural, mechanical, or respirator ventilation Signup and view all the answers

Where should gas cylinders and welding power sources be located to reduce danger in welding?

Outside confined spaces Signup and view all the answers

In what locations must special consideration be given to the safety and health of welders?

Confined spaces Signup and view all the answers

What should be done before connecting or disconnecting a regulator from a gas cylinder?

Release the internal pressure in the regulator Signup and view all the answers

What type of threads do flammable gas cylinders typically have on their outlet valves?

Left-hand threads Signup and view all the answers

What should be done before using regulators and their connection glands?

Inspect for dirt and damage Signup and view all the answers

What should not be done with leaking hoses or cylinder connections?

Forced with excessive torque Signup and view all the answers

Who should repair damaged regulators and components?

Trained mechanics or the manufacturer Signup and view all the answers

What are manifolds used for?

Uninterrupted gas supply or higher delivery rates Signup and view all the answers

What requirements must oxygen and fuel gas manifolds meet?

Specific design and safety requirements Signup and view all the answers

When should cylinder valves be closed?

After each use and when returning an empty cylinder Signup and view all the answers

What materials should not be used for piping and fittings for acetylene and MPS manifolds?

Unalloyed copper or copper alloys containing 70% or more copper Signup and view all the answers

Who should adjust pressure relief devices on cylinders designed for hostile environments?

Only trained personnel Signup and view all the answers

What must manifold piping systems contain for safety?

Overpressure relief valves, backflow check valves, and flash arresters Signup and view all the answers

For what should pressure reducing regulators be used?

The gas and pressure given on the label Signup and view all the answers

How should acetylene and liquefied gas cylinders be stored and used?

In the upright position, with cylinder contents identified by the label Signup and view all the answers

What should be in place on cylinders not in use?

Valve protection caps Signup and view all the answers

How should valves on high-pressure gas cylinders, especially oxygen, be opened?

Slowly to avoid adiabatic recompression Signup and view all the answers

What must be used to withdraw gas from cylinders?

Pressure-reducing regulators Signup and view all the answers

Why are cracking the cylinder valve and use of adapters to change the cylinder connection thread not recommended?

Due to safety concerns and potential contamination Signup and view all the answers

What should be consulted to check for exposure limits of certain materials in welding filler metals and fluxes?

Manufacturers' Material Safety Data Sheets Signup and view all the answers

What may also be present in base metals and coatings, in addition to welding filler metals and fluxes?

Materials with exposure limits of 1.0 mg/m3 or less Signup and view all the answers

What must not be welded on gas cylinders?

Radioactive materials Signup and view all the answers

What should cylinders be protected from during use or storage?

Damage Signup and view all the answers

What standards must gas cylinders be stored in accordance with?

State and local regulations, OSHA, and NFPA standards Signup and view all the answers

What should the cylinder valve outlet point away from during usage?

The operator Signup and view all the answers

What may happen if arc-damaged gas cylinders are not handled properly?

They may rupture, causing injury or death Signup and view all the answers

What should be in place on gas cylinders not in use?

Valve protection caps Signup and view all the answers

How should acetylene and liquefied gas cylinders be stored and used?

In the upright position Signup and view all the answers

What must be used to withdraw gas from cylinders?

Pressure-reducing regulators Signup and view all the answers

What should gas cylinders be protected from during use or storage?

Damage Signup and view all the answers

What should be consulted to check for exposure limits of certain materials in welding filler metals and fluxes?

Manufacturers' Material Safety Data Sheets Signup and view all the answers

What must be consulted to ensure gas cylinders are stored in accordance with regulations and standards?

State and local regulations, OSHA, and NFPA standards Signup and view all the answers

What should be in place on cylinders not in use?

Valve protection caps Signup and view all the answers

What may happen if arc-damaged gas cylinders are not handled properly?

They may rupture, causing injury or death Signup and view all the answers

What should be used to avoid adiabatic recompression when opening valves on high-pressure gas cylinders?

Open the valves slowly Signup and view all the answers

What should be used to withdraw gas from cylinders to ensure safe handling?

Pressure-reducing regulators Signup and view all the answers

What should not be recommended due to safety concerns and potential contamination?

Cracking the cylinder valve and use of adapters to change the cylinder connection thread Signup and view all the answers

What must be consulted to check for certain exposure limits of materials in welding filler metals and fluxes?

Manufacturers' Material Safety Data Sheets Signup and view all the answers

What should be consulted to check for materials with exposure limits of 1.0 mg/m3 or less in welding filler metals and fluxes?

Manufacturers' Material Safety Data Sheets Signup and view all the answers

What should be in place on gas cylinders not in use?

Valve protection caps Signup and view all the answers

What should be used to withdraw gas from cylinders?

Pressure-reducing regulators Signup and view all the answers

What should be avoided due to safety concerns and potential contamination?

Cracking the cylinder valve and use of adapters to change the cylinder connection thread Signup and view all the answers

Where should gas cylinders and welding power sources be located to reduce danger in welding?

In well-ventilated areas Signup and view all the answers

What must be in place on cylinders not in use to ensure safety?

Valve protection caps Signup and view all the answers

What should be used to avoid adiabatic recompression when opening high-pressure gas cylinder valves?

Open the valves slowly Signup and view all the answers

Where should acetylene and liquefied gas cylinders be stored and used?

In the upright position Signup and view all the answers

What should be prevented when using regulators and their connection glands?

Contamination Signup and view all the answers

What should be used before connecting to a regulator or manifold?

Clean the valve outlet Signup and view all the answers

What must gas cylinders be stored in accordance with?

State and local regulations and OSHA and NFPA standards Signup and view all the answers

What may cause injury or death if not protected from damage and secured against falling during use or storage?

Arc-damaged gas cylinders Signup and view all the answers

Study Notes

Gas Cylinder Safety and Handling Guidelines

Before connecting or disconnecting a regulator from a gas cylinder, the internal pressure in the regulator should be released.
The outlet threads on cylinder valves are standardized for specific gases, with flammable gas cylinders having left-hand threads and nonflammable gas cylinders having right-hand threads.
Regulators and their connection glands should be inspected for dirt and damage before use.
Leaking hoses or cylinder connections should not be forced with excessive torque.
Damaged regulators and components should be repaired by trained mechanics or returned to the manufacturer for repair.
Manifolds are used for uninterrupted gas supply or higher delivery rates, and must be designed for specific gas and operating pressure, and be leak-tight.
Oxygen and fuel gas manifolds must meet specific design and safety requirements.
Cylinder valves should be closed after each use and when returning an empty cylinder to the supplier to prevent leaks and backflow of contaminants.
Piping and fittings for acetylene and MPS manifolds must not be unalloyed copper or copper alloys containing 70% or more copper.
Only trained personnel should adjust pressure relief devices on cylinders, designed to relieve cylinder contents in hostile environments.
Manifold piping systems must contain overpressure relief valves, backflow check valves, and flash arresters for safety.
Pressure reducing regulators must be used only for the gas and pressure given on the label, and the threaded connections to the regulator must not be forced.

Safe Handling and Storage of Welding Gas Cylinders

Certain materials used in welding have exposure limits of 1.0 mg/m3 or less, such as those listed in Table 2.2.
Manufacturers' Material Safety Data Sheets should be consulted to check for these materials in welding filler metals and fluxes.
Welding filler metals and fluxes are not the only source of these materials; they may also be present in base metals and coatings.
Radioactive materials must not be welded on gas cylinders, and cylinders should not be part of an electrical circuit.
Arc-damaged gas cylinders may rupture, causing injury or death.
Cylinders should be protected from damage, stored in appropriate areas, and secured against falling during use or storage.
Acetylene and liquefied gas cylinders should be stored and used in the upright position, and cylinder contents should be identified by the label.
Valve protection caps should be in place on cylinders not in use, and the cylinder should never be lifted manually or hoisted by the valve protection cap.
Gas cylinders must be stored in accordance with state and local regulations and OSHA and NFPA standards.
Valves on high-pressure gas cylinders, especially oxygen, should be opened slowly to avoid adiabatic recompression, and the cylinder valve outlet should point away from the operator.
Pressure-reducing regulators must be used to withdraw gas from cylinders, and the valve outlet should be cleaned before connecting to a regulator or manifold.
Cracking the cylinder valve and use of adapters to change the cylinder connection thread are not recommended due to safety concerns and potential contamination.

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Test your knowledge of safe handling and storage practices for welding gas cylinders with this quiz. Learn about proper storage, handling, and safety precautions to prevent accidents and ensure compliance with OSHA and NFPA standards.

WIT-04

Podcast Beta

Questions and Answers

What must be used if exposure would exceed permissible limits with available ventilation?

What must be done to prevent inadvertent operation and injury when repairing machinery by welding or brazing?

What is the single most important factor influencing exposure to fumes?

What must rotating and automatic welding machines, fixtures, and welding robots be equipped with?

What must be ensured by ventilation in confined spaces?

What can result from asphyxiation in confined spaces?

Where may lighter-than-air gases accumulate in confined spaces?

What concentration of oxygen-enriched atmospheres is considered hazardous?

How should confined spaces be tested before entry?

What must be used when proper ventilation cannot be provided in confined areas where welding or cutting processes are carried out?

What presents special hazards when welding or cutting outside or inside containers and vessels that have held dangerous substances?

What precautions must be observed when welding or cutting inside vessels that have held dangerous materials?

What must be prevented inside containers during welding?

Which specifications must be followed for cylinders used in welding and cutting operations?

What should welders be trained to do to avoid high exposure levels?

Where can pinch points on welding and mechanical equipment result in injury?

What has a significant influence on fume amounts and welder’s exposure?

Why is adequate ventilation necessary in welding?

What must be prevented during welding, brazing, and cutting?

What do background fume levels depend on?

In which type of welding are fumes and gases usually a greater concern?

What influences fume components and the amount generated in welding?

What may contribute significantly to the hazard potential of the fume in welding?

What methods of ventilation are available for welding?

Where should gas cylinders and welding power sources be located to reduce danger in welding?

In what locations must special consideration be given to the safety and health of welders?

What should be done before connecting or disconnecting a regulator from a gas cylinder?

What type of threads do flammable gas cylinders typically have on their outlet valves?

What should be done before using regulators and their connection glands?

What should not be done with leaking hoses or cylinder connections?

Who should repair damaged regulators and components?

What are manifolds used for?

What requirements must oxygen and fuel gas manifolds meet?

When should cylinder valves be closed?

What materials should not be used for piping and fittings for acetylene and MPS manifolds?

Who should adjust pressure relief devices on cylinders designed for hostile environments?

What must manifold piping systems contain for safety?

For what should pressure reducing regulators be used?

How should acetylene and liquefied gas cylinders be stored and used?

What should be in place on cylinders not in use?

How should valves on high-pressure gas cylinders, especially oxygen, be opened?

What must be used to withdraw gas from cylinders?

Why are cracking the cylinder valve and use of adapters to change the cylinder connection thread not recommended?

What should be consulted to check for exposure limits of certain materials in welding filler metals and fluxes?

What may also be present in base metals and coatings, in addition to welding filler metals and fluxes?

What must not be welded on gas cylinders?

What should cylinders be protected from during use or storage?

What standards must gas cylinders be stored in accordance with?

What should the cylinder valve outlet point away from during usage?

What may happen if arc-damaged gas cylinders are not handled properly?

What should be in place on gas cylinders not in use?

How should acetylene and liquefied gas cylinders be stored and used?

What must be used to withdraw gas from cylinders?

What should gas cylinders be protected from during use or storage?

What should be consulted to check for exposure limits of certain materials in welding filler metals and fluxes?

What must be consulted to ensure gas cylinders are stored in accordance with regulations and standards?

What should be in place on cylinders not in use?

What may happen if arc-damaged gas cylinders are not handled properly?

What should be used to avoid adiabatic recompression when opening valves on high-pressure gas cylinders?

What should be used to withdraw gas from cylinders to ensure safe handling?

What should not be recommended due to safety concerns and potential contamination?

What must be consulted to check for certain exposure limits of materials in welding filler metals and fluxes?

What should be consulted to check for materials with exposure limits of 1.0 mg/m3 or less in welding filler metals and fluxes?

What should be in place on gas cylinders not in use?

What should be used to withdraw gas from cylinders?

What should be avoided due to safety concerns and potential contamination?

Where should gas cylinders and welding power sources be located to reduce danger in welding?

What must be in place on cylinders not in use to ensure safety?

What should be used to avoid adiabatic recompression when opening high-pressure gas cylinder valves?

Where should acetylene and liquefied gas cylinders be stored and used?

What should be prevented when using regulators and their connection glands?

What should be used before connecting to a regulator or manifold?

What must gas cylinders be stored in accordance with?

What may cause injury or death if not protected from damage and secured against falling during use or storage?

Study Notes

Studying That Suits You

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