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Heavy Duty Equipment Technician Red Seal Exam Prep · Question

A heavy equipment technician is preparing an oxy-fuel cutting rig for an emergency repair on a steel plate. The oxygen cylinder pressure gauge reads 14,000 kPa, and the acetylene cylinder reads 1,700 kPa. Which of the following is the maximum working pressure recommended for the acetylene regulator when cutting this material?

CSA W117.2 Safety in Welding, Cutting, and Allied Processes, and general industry best practices, recommend a maximum working pressure of 103 kPa (15 psi) for a

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Question: A heavy equipment technician is preparing an oxy-fuel cutting rig for an emergency repair on a steel plate. The oxygen cylinder pressure gauge reads 14,000 kPa, and the acetylene cylinder reads 1,700 kPa. Which of the following is the maximum working pressure recommended for the acetylene regulator when cutting this material?

Answer options: ✅ 103 kPa (15 psi)

  • 500 kPa (72.5 psi)
  • 1,000 kPa (145 psi)
  • 1,700 kPa (246.5 psi)

Correct answer: 103 kPa (15 psi)

Explanation: CSA W117.2 Safety in Welding, Cutting, and Allied Processes, and general industry best practices, recommend a maximum working pressure of 103 kPa (15 psi) for acetylene to prevent the gas from becoming unstable and spontaneously decomposing.

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