The minimum pipe design pressure for halocarbon clean agent HFC-227ea, with an agent container pressure of 249 psi is _____.

The minimum pipe design pressure for halocarbon clean agent HFC-227ea, with an agent container pressure of 249 psi is _____.

• A. 150 psi
• B. 249 psi
• C. 200 psi
• D. 300 psi

Answer: (C)

This item tests how minimum pipe design pressure for halocarbon clean agent piping is determined. For HFC-227ea systems, a conservative design approach uses a percentage of the agent container pressure to set the minimum pipe design pressure, providing a safety margin for temperature and fill variations. The standard guideline applies 0.8 (80%) of the container pressure. With an agent container pressure of 249 psi, the calculation is 0.8 × 249 ≈ 199 psi, which rounds to 200 psi. That’s why the minimum pipe design pressure is 200 psi. This margin helps ensure the piping can safely handle the pressures encountered during discharge. Options like 150 psi are too low, 249 psi would omit the margin, and 300 psi is higher than the required minimum.

This item tests how minimum pipe design pressure for halocarbon clean agent piping is determined. For HFC-227ea systems, a conservative design approach uses a percentage of the agent container pressure to set the minimum pipe design pressure, providing a safety margin for temperature and fill variations. The standard guideline applies 0.8 (80%) of the container pressure. With an agent container pressure of 249 psi, the calculation is 0.8 × 249 ≈ 199 psi, which rounds to 200 psi. That’s why the minimum pipe design pressure is 200 psi. This margin helps ensure the piping can safely handle the pressures encountered during discharge. Options like 150 psi are too low, 249 psi would omit the margin, and 300 psi is higher than the required minimum.