Coast Guard Regulations (46 CFR Part 56) permit copper pipe to be used for steam service subjected to a maximum pressure and temperature of __________.

Correct Answer: Option C — 250 psi and 406°F

Title 46 CFR Part 56 restricts copper piping in steam service to maximum limits of 250 psi and 406°F to prevent rapid material degradation, thermal stress failure, and catastrophic rupture under high temperatures.