In accordance with Coast Guard Regulations (46 CFR), which of the following materials may be used in short lengths between the fuel oil boiler front header manifold and the atomizer head to provide flexibility?
• 46 CFR requirements for fuel oil systems in boiler installations • Material properties needed for flexible high‑temperature, high‑pressure fuel oil lines • Differences between copper, copper‑nickel alloys, and nickel‑copper alloys in terms of strength and heat resistance
• Which materials listed are commonly accepted for high‑temperature fuel oil service near boilers, and which are more often restricted? • How does the Coast Guard treat copper in fuel oil lines exposed to heat and vibration? Are there specific limitations or conditions? • Is it more likely that the regulation specifies one particular alloy, a group of alloys, or permits any of the listed metals for this specific flexible connection?
• Check 46 CFR sections on fuel oil piping for boilers and look for any explicitly named materials allowed between the header manifold and atomizer head • Verify whether plain copper tubing is subject to special prohibitions or restrictions in fuel oil service near open flames or high temperatures • Confirm whether the regulation uses wording like "may be of" or "may be constructed of" followed by a specific list or combination of acceptable materials for this short flexible length
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