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?

    <p>Appropriate guards or sensing devices</p> Signup and view all the answers

    What must be ensured by ventilation in confined spaces?

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

    What can result from asphyxiation in confined spaces?

    <p>Unconsciousness and death without warning</p> Signup and view all the answers

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

    <p>Tank tops, high areas, and near ceilings</p> Signup and view all the answers

    What concentration of oxygen-enriched atmospheres is considered hazardous?

    <p>Above 25%</p> Signup and view all the answers

    How should confined spaces be tested before entry?

    <p>For toxic or flammable gases and vapors and adequate oxygen</p> 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?

    <p>Positive pressure self-contained breathing apparatus</p> 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?

    <p>Flammable or toxic vapors potentially present</p> Signup and view all the answers

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

    <p>The precautions for confined spaces</p> Signup and view all the answers

    What must be prevented inside containers during welding?

    <p>Pressure buildup</p> Signup and view all the answers

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

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

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

    <p>Keep their head to one side of the fume plume</p> Signup and view all the answers

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

    <p>Fingers and hands</p> Signup and view all the answers

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

    <p>Ventilation</p> Signup and view all the answers

    Why is adequate ventilation necessary in welding?

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

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

    <p>Overexposure to fumes and gases</p> Signup and view all the answers

    What do background fume levels depend on?

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

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

    <p>Arc welding</p> Signup and view all the answers

    What influences fume components and the amount generated in welding?

    <p>The type of base metal being welded</p> Signup and view all the answers

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

    <p>Surface contaminants or coatings</p> Signup and view all the answers

    What methods of ventilation are available for welding?

    <p>Natural, mechanical, or respirator ventilation</p> Signup and view all the answers

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

    <p>Outside confined spaces</p> Signup and view all the answers

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

    <p>Confined spaces</p> Signup and view all the answers

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

    <p>Release the internal pressure in the regulator</p> Signup and view all the answers

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

    <p>Left-hand threads</p> Signup and view all the answers

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

    <p>Inspect for dirt and damage</p> Signup and view all the answers

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

    <p>Forced with excessive torque</p> Signup and view all the answers

    Who should repair damaged regulators and components?

    <p>Trained mechanics or the manufacturer</p> Signup and view all the answers

    What are manifolds used for?

    <p>Uninterrupted gas supply or higher delivery rates</p> Signup and view all the answers

    What requirements must oxygen and fuel gas manifolds meet?

    <p>Specific design and safety requirements</p> Signup and view all the answers

    When should cylinder valves be closed?

    <p>After each use and when returning an empty cylinder</p> Signup and view all the answers

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

    <p>Unalloyed copper or copper alloys containing 70% or more copper</p> Signup and view all the answers

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

    <p>Only trained personnel</p> Signup and view all the answers

    What must manifold piping systems contain for safety?

    <p>Overpressure relief valves, backflow check valves, and flash arresters</p> Signup and view all the answers

    For what should pressure reducing regulators be used?

    <p>The gas and pressure given on the label</p> Signup and view all the answers

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

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

    What should be in place on cylinders not in use?

    <p>Valve protection caps</p> Signup and view all the answers

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

    <p>Slowly to avoid adiabatic recompression</p> Signup and view all the answers

    What must be used to withdraw gas from cylinders?

    <p>Pressure-reducing regulators</p> Signup and view all the answers

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

    <p>Due to safety concerns and potential contamination</p> Signup and view all the answers

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

    <p>Manufacturers' Material Safety Data Sheets</p> Signup and view all the answers

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

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

    What must not be welded on gas cylinders?

    <p>Radioactive materials</p> Signup and view all the answers

    What should cylinders be protected from during use or storage?

    <p>Damage</p> Signup and view all the answers

    What standards must gas cylinders be stored in accordance with?

    <p>State and local regulations, OSHA, and NFPA standards</p> Signup and view all the answers

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

    <p>The operator</p> Signup and view all the answers

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

    <p>They may rupture, causing injury or death</p> Signup and view all the answers

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

    <p>Valve protection caps</p> Signup and view all the answers

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

    <p>In the upright position</p> Signup and view all the answers

    What must be used to withdraw gas from cylinders?

    <p>Pressure-reducing regulators</p> Signup and view all the answers

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

    <p>Damage</p> Signup and view all the answers

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

    <p>Manufacturers' Material Safety Data Sheets</p> Signup and view all the answers

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

    <p>State and local regulations, OSHA, and NFPA standards</p> Signup and view all the answers

    What should be in place on cylinders not in use?

    <p>Valve protection caps</p> Signup and view all the answers

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

    <p>They may rupture, causing injury or death</p> Signup and view all the answers

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

    <p>Open the valves slowly</p> Signup and view all the answers

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

    <p>Pressure-reducing regulators</p> Signup and view all the answers

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

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

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

    <p>Manufacturers' Material Safety Data Sheets</p> 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?

    <p>Manufacturers' Material Safety Data Sheets</p> Signup and view all the answers

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

    <p>Valve protection caps</p> Signup and view all the answers

    What should be used to withdraw gas from cylinders?

    <p>Pressure-reducing regulators</p> Signup and view all the answers

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

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

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

    <p>In well-ventilated areas</p> Signup and view all the answers

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

    <p>Valve protection caps</p> Signup and view all the answers

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

    <p>Open the valves slowly</p> Signup and view all the answers

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

    <p>In the upright position</p> Signup and view all the answers

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

    <p>Contamination</p> Signup and view all the answers

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

    <p>Clean the valve outlet</p> Signup and view all the answers

    What must gas cylinders be stored in accordance with?

    <p>State and local regulations and OSHA and NFPA standards</p> 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?

    <p>Arc-damaged gas cylinders</p> 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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    Description

    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.

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