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Gas Fitter Practice · Question

What is the maximum allowed pressure for propane in the vapor phase within a residential service piping system, before the appliance regulator?

Residential propane service piping typically operates at medium pressure, often around 207 kPa (30 psi), before a secondary regulator at the appliance reduces i

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Question: What is the maximum allowed pressure for propane in the vapor phase within a residential service piping system, before the appliance regulator?

Answer options:

  • 7 kPa (1 psi)
  • 70 kPa (10 psi) ✅ 207 kPa (30 psi)
  • Pressure is regulated at the cylinder, so no specific maximum

Correct answer: 207 kPa (30 psi)

Explanation: Residential propane service piping typically operates at medium pressure, often around 207 kPa (30 psi), before a secondary regulator at the appliance reduces it further. Consult CSA B149.2 for specific limits.

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