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Quizzes > Science

Acetylene Gas True or False: Oxy-Acetylene Torch Safety Quiz

Quick, free oxy acetylene torch safety quiz. Instant results.

Editorial: Review CompletedCreated By: Smooth ChipUpdated Aug 24, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art illustration acetylene gas cylinder torch valve icons storage safety True False quiz on sky blue background

This true/false quiz helps you check oxy-acetylene torch safety and how acetylene gas behaves, covering storage, setup, use, and shutdown. Get quick feedback on each answer, then try acetylene gas true or false, test yourself with a welding safety quiz, or review an OSHA hazard communication quiz.

Acetylene cylinders must always be stored upright to ensure safety.
True
False
Storing acetylene cylinders upright ensures the porous mass and solvent remain properly positioned, reducing the risk of leakage or unsafe acetylene release. This position also prevents acetone from fleeing out of the cylinder valve. Upright storage minimizes decomposition hazards by keeping the internal components stable.
Acetylene cylinders must be laid on their side during storage.
True
False
Laying acetylene cylinders on their side can allow the solvent to move toward the valve, increasing the risk of leaks and unstable gas release. Proper storage requires cylinders to remain upright at all times. This upright position maintains the correct placement of dissolved acetylene and prevents unsafe conditions.
A flashback occurs when the flame travels back into the torch body or hose.
True
False
A flashback is a condition where the flame front propagates back into the torch handle, hose, or regulator, which can damage equipment and pose serious safety risks. It is crucial to identify and prevent flashbacks with proper safety devices. Flashback arrestors and regular inspections help mitigate this hazard.
Acetylene cylinders can be stored in the same compartment as gasoline or other flammable liquids.
True
False
Acetylene cylinders must be stored separately from gasoline and other flammable liquids to prevent fires or explosions in case of a leak. Segregated storage reduces the risk of cross-contamination with incompatible materials. Good housekeeping and proper segregation are key components of gas safety.
Acetylene should not be pressurized above 15 psi in industrial piping because it can decompose explosively under higher pressures.
True
False
Acetylene becomes unstable and may decompose explosively at pressures above 15 psi in piping systems. To prevent shock or rapid pressure changes that can initiate decomposition, industrial piping is limited to this maximum. This guideline is emphasized in safety standards for oxy-fuel applications.
Flashback arrestors must be installed on both the torch and the regulator for maximum safety.
False
True
Installing flashback arrestors at both the torch and regulator prevents flame or pressure surges from traveling back into the supply lines. Dual protection reduces the chance of flashbacks damaging equipment or causing injury. Regulatory bodies recommend multiple arrestor installation points for redundancy.
When shutting off an oxy-acetylene torch, oxygen should be turned off before acetylene to prevent backflash.
False
True
Proper shutdown procedure dictates closing the acetylene valve first to cut fuel supply and prevent flame propagation back into the system. Oxygen is closed second to avoid rich mixtures that can trigger flashbacks. Adhering to this sequence enhances operator safety.
Acetylene is typically dissolved in acetone within the cylinder to allow safe storage under pressure.
True
False
Dissolving acetylene in acetone within a porous-packed cylinder increases safe storage capacity by preventing free acetylene which is unstable at elevated pressures. The acetone acts as a solvent and heat sink, reducing decomposition risk. This method is standard practice for industrial gas cylinders.
Copper and silver components in contact with acetylene can form explosive acetylide compounds.
False
True
When acetylene contacts copper, silver, or their alloys, it can form metallic acetylide compounds that are highly sensitive and explosive. Safety standards require using compatible materials such as brass or stainless steel in acetylene systems. Avoiding reactive metals prevents these dangerous deposits.
Acetylene decomposition can be triggered by a sudden drop in temperature inside the cylinder.
False
True
Acetylene decomposition is typically initiated by heat, shock, or contamination rather than a decrease in temperature. A sudden rise in temperature or pressure impulses can destabilize dissolved acetylene leading to explosive decomposition. Cool conditions generally inhibit, rather than promote, decomposition.
The primary safety device to stop flashbacks in supply lines is a backflow check valve.
False
True
A backflow check valve prevents gas from flowing backward towards the cylinder if a flashback occurs. This device stops flames from entering the supply line and protects the regulator and cylinder. It is a critical component in flashback prevention systems.
Using 1/4-inch internal diameter hoses for acetylene is recommended in high-demand cutting operations.
False
True
For high-demand cutting operations, acetylene hoses should typically have at least a 5/16-inch internal diameter to ensure adequate gas flow. Smaller 1/4-inch hoses can restrict flow, leading to unstable pressures and poor cutting performance. Proper hose sizing is essential for safety and efficiency.
Soap solution testing is an effective method to detect small acetylene leaks in equipment and connections.
True
False
Applying a soap or leak detection solution to joints and connections helps form bubbles at leak points, making small acetylene leaks visible. This inexpensive and reliable method is widely recommended in safety protocols. Regular leak checks prevent gas accumulation and potential fires.
After a flashback, it is essential to allow the torch tip to cool before reopening the gas valves to ensure safety.
True
False
Allowing the torch tip to cool before reopening gas valves prevents reignition and further flashbacks by dissipating heat from hot spots. Inspecting the equipment for damage and verifying arrestor functionality should follow cooling. This practice is part of standard flashback response procedures.
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Study Outcomes

  1. Understand acetylene gas explosiveness -

    Explain why acetylene can be explosive under certain conditions and clarify the misconception that acetylene gas is not explosive.

  2. Apply proper storage techniques -

    Implement correct storage protocols for acetylene cylinders to minimize ignition risks and maintain compliance with safety standards.

  3. Identify oxy-acetylene torch components -

    Distinguish between regulators, hoses, tips, and other parts to ensure proper assembly and safe operation.

  4. Analyze safe startup and shutdown procedures -

    Sequence the steps required for lighting and extinguishing the torch to prevent accidents and ensure controlled operations.

  5. Evaluate true/false safety statements -

    Use a quiz format to test your understanding of oxy-acetylene torch safety, including assessing the claim that acetylene gas is not explosive.

Cheat Sheet

  1. Acetylene's Explosive Potential -

    Acetylene gas becomes unstable above 15 psi and can detonate if allowed to decompose rapidly (CGA G-1.5). Remember the combustion equation C₂H₂ + 2.5 O₂ → 2 CO₂ + H₂O to visualize its energy release. Use the mnemonic "Acetone Anchors Acetylene" to recall why cylinders store gas dissolved in acetone, reducing free”gas explosivity.

  2. Proper Cylinder Storage -

    Per OSHA 29 CFR 1926.350, store acetylene cylinders upright, secured, and at temperatures below 125 °F (52 °C). Keep them at least 20 ft from ignition sources or separate by a fireproof barrier. Use the "STACK" trick - Separate, Temperate, Anchor, Check, Keep - for quick recall of safe storage steps.

  3. Identifying Torch Components -

    AWS F4.1 requires both oxygen and acetylene regulators, hoses, torch handle, and mixer to be in top condition. Flashback arrestors on each line prevent reverse fire; test fittings with a soapy-water check. Label hoses red (fuel) and green (oxygen) and inspect annually per CGA guidelines.

  4. Safe Shutdown Sequence -

    Always shut off acetylene first, then oxygen, to prevent flashback (refer to AWS procedure). After closing tank valves, bleed pressure from hoses by opening torch valves until gauges read zero. Follow the "OFF, BLEED, OFF" mnemonic: Off handles, Bleed lines, Off tank valves.

  5. Quiz Fact: True or False? -

    "Acetylene gas is not explosive True/False?" is False when free; pure C₂H₂ is highly explosive, but in acetone solution it's stabilized (NIOSH). Challenge yourself: understand why "dissolved vs. free" changes explosiveness and ace the oxy-acetylene torch safety quiz!

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