Compressed Gas Cylinder Safety Quiz
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Questions and Answers

What is a fundamental rule for using acetylene manifold systems?

  • Cylinders can only be filled by untrained personnel.
  • Cylinders can have varying pressures as long as they are the same size.
  • Oxygen cylinders can replace acetylene cylinders in the manifold system.
  • Cylinders of equal pressure must be used. (correct)

    • What occurs if cylinders of unequal pressures are utilized in acetylene manifold systems?

  • The system will become more efficient.
  • The draw limit of the full cylinders will be exceeded. (correct)
  • There will be no significant impact on gas flow.
  • Gas will be redirected automatically to a safer container.

    • What is not a recommended practice when selecting manifolds?

  • Choosing manifolds that conform to CGA standards.
  • Selecting manifolds without manufacturer specifications. (correct)
  • Opting for manifolds designed for multiple gas types.
  • Using manifolds from reputable manufacturers.

    • What equipment feature is present in acetylene manifold systems to prevent backflow?

    <p>One-way check valves.</p> Signup and view all the answers

    Why is a cooling water spray required when filling acetylene cylinders?

    <p>To prevent temperature rise and explosion risk.</p> Signup and view all the answers

    What is the minimum oxygen requirement for one volume of propylene gas?

    <p>2.6 volumes</p> Signup and view all the answers

    Which fuel gas has the closest oxygen to fuel gas ratio to natural gas?

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

    How is liquid oxygen stored?

    <p>In cryogenic containers</p> Signup and view all the answers

    What characteristic of natural gas makes it useful for cutting operations?

    <p>It is low cost and readily available</p> Signup and view all the answers

    Which component is NOT typically found in a liquid oxygen tank?

    <p>Pressure Relief Valve</p> Signup and view all the answers

    What is a common use for natural gas in industrial settings?

    <p>Heating and cutting</p> Signup and view all the answers

    What is the typical internal pressure of a liquid oxygen vessel?

    <p>1655 kPa</p> Signup and view all the answers

    Which fuel gas requires the highest volume of oxygen for combustion?

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

    What is the minimum distance oxygen and fuel gas cylinders should be stored apart?

    <p>6 metres (20 ft)</p> Signup and view all the answers

    What is the recommended position to store and use gas cylinders?

    <p>Vertical position</p> Signup and view all the answers

    Which of the following actions should be avoided when handling gas cylinders?

    <p>Using cylinders as supports</p> Signup and view all the answers

    What must the markings on compressed gas cylinders be made with?

    <p>Stenciling, stamping, or labeling</p> Signup and view all the answers

    Why should cylinder colors not be relied upon for gas identification?

    <p>Colors may appear differently under certain lights</p> Signup and view all the answers

    Which gas should never be transferred from one cylinder to another?

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

    What is the purpose of the WHMIS label on compressed gas cylinders?

    <p>To convey safety information</p> Signup and view all the answers

    What should be done when returning empty gas cylinders to the supplier?

    <p>Close cylinder valves and place protective caps</p> Signup and view all the answers

    What should you use instead of oxygen for dusting purposes?

    <p>Compressed air</p> Signup and view all the answers

    Which of the following is a correct practice for handling equipment with gas cylinders?

    <p>Operating cylinder valves according to instructions</p> Signup and view all the answers

    What is the recommended maximum opening for key type valves on acetylene cylinders?

    <p>1 to 1.5 turns</p> Signup and view all the answers

    What type of threads do valve outlets on acetylene cylinders typically have?

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

    What is the purpose of fusible metal plugs in acetylene cylinders?

    <p>To provide a controlled escape of gas during fire</p> Signup and view all the answers

    Where are fusible plugs commonly located in acetylene cylinders?

    <p>Concave bottom, reinforcing collar, or shoulders</p> Signup and view all the answers

    How many turns should hand wheel-type acetylene valves generally be opened?

    <p>1 to 1.5 turns</p> Signup and view all the answers

    Which property is essential for a fuel gas to be suitable for heating and cutting operations?

    <p>High heat content</p> Signup and view all the answers

    What is the primary component used to generate acetylene gas in acetylene generators?

    <p>Granulated calcium carbide and water</p> Signup and view all the answers

    What is the maximum safe working pressure of acetylene gas?

    <p>103 kPa (15 psi)</p> Signup and view all the answers

    Among the listed fuel gases, which has the widest explosive range in air?

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

    What is the neutral flame temperature of acetylene?

    <p>3090°C</p> Signup and view all the answers

    Which of the following gases has a higher BTU heat value than acetylene?

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

    What is a potential hazard when compressing acetylene gas?

    <p>It can spontaneously ignite.</p> Signup and view all the answers

    Which alternative fuel gas can be viewed as a better choice for large heating tasks?

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

    What pressure will cause the metal rupture disc to burst and release gas from the oxygen cylinder?

    <p>22 063 kPa</p> Signup and view all the answers

    What characteristic does not typically affect the selection of a fuel gas?

    <p>Color of the gas</p> Signup and view all the answers

    What happens to the pressure readings in an oxygen cylinder when the temperature increases?

    <p>They increase.</p> Signup and view all the answers

    Which mixture requires 4 to 4.5 times its volume of oxygen for proper combustion?

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

    At what temperature does the oxygen cylinder have a pressure reading of 15 600 kPa?

    <p>27 °C</p> Signup and view all the answers

    Which of the following pressure readings indicates that the cylinder is nearly empty (has about 0.566 m³ of contents)?

    <p>1310 kPa</p> Signup and view all the answers

    Which temperature corresponds to a pressure of 12 100 kPa in an oxygen cylinder?

    <p>0 °C</p> Signup and view all the answers

    What is the primary purpose of a regulator in an oxyacetylene outfit?

    <p>To reduce source pressure and maintain constant delivery pressure</p> Signup and view all the answers

    Which part of the regulator acts as a pressure-sensitive element?

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

    What are the two types of classification for regulators?

    <p>Acetylene or oxygen, and single-stage or two-stage</p> Signup and view all the answers

    How does the adjusting screw affect the diaphragm in the regulator?

    <p>It forces the diaphragm to move and control gas flow</p> Signup and view all the answers

    What happens to the diaphragm when gas fills the low-pressure chamber?

    <p>It moves in the opposite direction to close the passageway</p> Signup and view all the answers

    Which of the following items is NOT included in the accessory package of the oxyacetylene outfit?

    <p>Acetylene bottle</p> Signup and view all the answers

    What role does the valve stem play in the regulator's operation?

    <p>It controls the flow of gas between chambers</p> Signup and view all the answers

    What triggers the gas flow into the low-pressure chamber of the regulator?

    <p>The inwards adjustment of the screw</p> Signup and view all the answers

    Which component maintains the pressure set by the adjusting screw?

    <p>The valve/seat assembly</p> Signup and view all the answers

    Which of the following statements accurately describes the diaphragm's function?

    <p>It separates two gas pressure chambers</p> Signup and view all the answers

    What is the minimum wall thickness of an oxygen cylinder?

    <p>7.4 mm</p> Signup and view all the answers

    How often is an oxygen cylinder re-tested after the first retest?

    <p>Every five years</p> Signup and view all the answers

    Which feature is NOT part of an oxygen cylinder’s design?

    <p>Flat top</p> Signup and view all the answers

    What is the consequence of cylinders that show obvious signs of abuse?

    <p>They are taken out of service and scrapped.</p> Signup and view all the answers

    What occurs during a hydrostatic test of an oxygen cylinder?

    <p>The cylinder is filled with a liquid to a certain pressure.</p> Signup and view all the answers

    What is the correct action for an empty cylinder?

    <p>Mark it 'MT' and call the supplier.</p> Signup and view all the answers

    Which size of oxygen cylinder is the most popular?

    <p>6.9 m3 (244 ft3)</p> Signup and view all the answers

    What is the primary risk associated with storing cylinders near arc welding equipment?

    <p>They may result in an explosion and fire.</p> Signup and view all the answers

    What type of cap protects the valve of an oxygen cylinder?

    <p>Removable protective metal cap</p> Signup and view all the answers

    What should be done with a faulty or leaking cylinder?

    <p>Tag it and remove it from the work area.</p> Signup and view all the answers

    What is the primary purpose of the porous material in acetylene cylinders?

    <p>To keep acetylene gas dissolved in acetone</p> Signup and view all the answers

    Why must acetylene cylinders be used in the vertical position?

    <p>To prevent acetone from being drawn off</p> Signup and view all the answers

    At what pressure is the acetylene cylinder filled, allowing acetone to absorb acetylene effectively?

    <p>1724 kPa (250 psi)</p> Signup and view all the answers

    What is used to stabilize acetylene gas in storage?

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

    What material is often found in older acetylene cylinders?

    <p>Balsa wood</p> Signup and view all the answers

    What happens to acetylene's stability as pressure decreases in the cylinder?

    <p>It becomes unstable</p> Signup and view all the answers

    What percentage of porosity do newer acetylene cylinders filled with calcium-silicate typically have?

    <p>90% to 92%</p> Signup and view all the answers

    What should be done if an empty acetylene cylinder weighs less than the stamped weight?

    <p>Add acetone until the specified weight is reached</p> Signup and view all the answers

    What is the effect of pure oxygen on materials that are normally not considered combustible?

    <p>They may burn rapidly and violently.</p> Signup and view all the answers

    What is the primary method used today to produce oxygen for welding and cutting?

    <p>Air liquefaction.</p> Signup and view all the answers

    What must be done when a fire ignites from a ruptured oxygen hose?

    <p>Stop the flow of fuel gas.</p> Signup and view all the answers

    What is the main characteristic of oxygen that poses a danger during handling?

    <p>It supports combustion.</p> Signup and view all the answers

    At what temperature does the air liquefaction process initially cool air to convert it to liquid?

    <p>-194°C</p> Signup and view all the answers

    How pure is the oxygen produced by air liquefaction for welding and cutting purposes?

    <p>99.5% pure.</p> Signup and view all the answers

    Which of the following gases is present in the largest percentage in atmospheric air at sea level?

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

    What type of flame is produced by burning rubber in the presence of oxygen?

    <p>White flame with no smoke.</p> Signup and view all the answers

    What occurs to nitrogen in the air liquefaction process?

    <p>It is vented as gas.</p> Signup and view all the answers

    What is the primary role of the oxygen compressor in the air liquefaction process?

    <p>To store oxygen in cylinders.</p> Signup and view all the answers

    Study Notes

    Compressed Gas Cylinder Handling

    • Store cylinders in a cool, dry, well-ventilated area, ensuring oxygen and fuel gas cylinders are at least 6 meters (20 ft) apart.
    • Maintain cylinders in a vertical position and avoid transferring acetylene between cylinders.
    • Do not drop or use cylinders as rollers or supports; ensure they are not subjected to impact.
    • Use proper gas names; avoid referring to acetylene as gas or oxygen as air.
    • Always operate cylinder valves according to the provided instructions.
    • Keep oxyfuel equipment away from oil, grease, and electric arc welding to prevent fire hazards.
    • Employ a proper pressure regulator when using oxygen or fuel gas from cylinders.
    • Close valves on empty cylinders before returning them and protect the valves with caps.
    • Use specially designed cradles when lifting cylinders with a crane.

    Gas Cylinder Identification

    • Markings on cylinders must display the chemical or trade name of the gas using stencilled or stamped labels that are not easily removable.
    • Preferred marking location is on the cylinder's shoulder, with lettering height not less than 3.2 mm (1/8 inch).
    • Cylinder color should not be relied upon for gas identification due to variability among suppliers and conditions affecting paint visibility.

    WHMIS Guidelines

    • WHMIS labels are required on all compressed gas cylinders.
    • Labels must include a product identifier, supplier identifier, and a comprehensive hazard statement.

    Manifold Systems

    • Manifold systems are designed to connect multiple gas cylinders for efficient gas delivery.
    • Only utilize manifolds manufactured to standards established by the Compressed Gas Association (CGA).
    • Equal pressure must be maintained between cylinders in acetylene manifold systems to avoid explosions caused by unequal pressure.

    Fuel Gases Overview

    • Propylene gas (C3H6) requires 2.6 volumes of oxygen for neutral flame applications.
    • Natural gas (CH4) is commonly used in heating and cutting; needs 1 to 2 volumes of preheat oxygen.
    • Oxygen to fuel gas ratios are critical for proper use, with table data showing specific ratios needed for acetylene, propane, propylene, and natural gas.

    Oxygen Storage and Use

    • Oxygen can be stored either in liquid form (cryogenic containers) or gaseous form in high-pressure cylinders.
    • Liquid oxygen is stored at -183°C (-297°F) and requires specially designed tanks to manage the low temperature.

    Acetylene Generators

    • Acetylene generators produce acetylene gas through the interaction of calcium carbide and water.
    • The generation of acetylene must be controlled to ensure safety and efficiency.

    Acetylene Properties

    • Acetylene is highly flammable and can form explosive mixtures with air at concentrations of 2.5% to 80%.
    • Storage of acetylene above 103 kPa (15 psi) is dangerous due to instability.

    Safety Features

    • Acetylene cylinders incorporate fusible metal plugs to enhance safety by melting at high temperatures to release pressure.
    • Oxygen cylinders include rupture discs that manage uncontrolled pressure increases by venting gas at specific thresholds.

    Oxygen Cylinder Specifications

    • Oxygen cylinders are high-pressure vessels with specific design features to endure high pressures, such as a minimum wall thickness of 7.4 mm.
    • Regular maintenance and hydrostatic testing are mandated for oxygen cylinders to ensure safety and functionality.

    Acetylene Cylinder Design

    • Acetylene cylinders are often constructed with a porous filling material to stabilize the gas safely at lower pressures.
    • Older designs may have a mixture of shredded asbestos and other materials to absorb acetylene safely.

    Important Precautions

    • Any damaged, faulty, or leaking cylinders must be removed from service immediately and reported to the supplier.
    • Do not attempt repairs on cylinders; adherence to safety guidelines is crucial to prevent accidents.### Safe Storage of Acetylene
    • Acetylene cylinders are filled with porous material to stabilize acetylene, which is unstable at pressures above 103 kPa (15 psi).
    • Acetylene gas is dissolved in acetone, a colorless, flammable liquid, to store it safely under pressure.
    • Acetone stabilizes acetylene by absorbing the gas into solution, similar to CO2 in soda pop.
    • The porous material within the cylinder maintains acetylene in solution by providing small volume spaces.
    • Cylinder dimensions are 103 cm high and 40.5 cm wide; contents may include monolithic filler, balsa wood, charcoal, Portland cement, and fine asbestos.
    • At 1724 kPa (250 psi), acetone absorbs 420 volumes of acetylene; pressure reduction decreases the acetone’s capacity to hold acetylene.
    • Cylinder is filled to 40% acetone capacity, weighed, and stamped with this weight; empty cylinders must not weigh less than this amount.
    • Acetylene cylinders must be used in a vertical position to prevent acetone from being drawn off during gas usage.

    Characteristics and Handling Procedures for Oxygen

    • Oxygen (O2) is a colorless, odorless, tasteless gas essential for life and combustion.
    • While non-flammable by itself, oxygen supports combustion and can react violently with combustible materials.
    • Oxygen for welding and cutting is primarily obtained through air liquefaction, along with other chemical processes and water electrolysis.

    Air Liquefaction Process

    • Involves purifying, compressing, and cooling air to a liquid at -194°C (-317°F), yielding a mix of 1/5 oxygen and 4/5 nitrogen.
    • The nitrogen is converted to gas by raising the temperature to -182°C (-295°F), allowing collection while venting off the rest.
    • Liquid oxygen collected is transformed into gas before being compressed into cylinders at pressures of 15.2 MPa (2200 psi).
    • Liquid oxygen can be directly shipped and converted to gas as needed, with purity standards at a minimum of 99.5% for welding and cutting.

    Hazards of Pure Oxygen

    • Pure oxygen can cause rubber to burn rapidly with a high-temperature flame, contrasting with the dull red flame in regular air.
    • Oxyfuel hoses, typically made from rubber and cotton or neoprene, are vulnerable to burns and ruptures from high temperatures.
    • If a hose ruptures during operation, it can lead to dangerous fires fueled by both fuel gas and oxygen.
    • Fire situations require stopping the flow of both oxygen and fuel gas and safely extinguishing the fire.

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    Description

    Test your knowledge on the safety guidelines for handling compressed gas cylinders. Learn about proper storage, usage, and safety measures to prevent accidents in the workplace. This quiz covers essential practices that must be followed to ensure safety when dealing with various types of gas cylinders.

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