Coast Guard Regulations (46 CFR Part 56)...

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Question 1 of 205eccef9abacbc34ba4d450e8

Coast Guard Regulations (46 CFR Part 56) require that screw joints shall not be used in piping systems where severe erosion, crevice corrosion, shock, or vibration is expected to occur, nor at temperatures over __________.

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🔍 Key Concepts

• 46 CFR Part 56 piping regulations for screw joints • Material and joint limitations at elevated temperatures • Why threaded/screw joints are limited in systems with vibration, shock, and high temperature

💭 Think About

• Think about what happens to threaded/screw joints as temperature increases: expansion, loss of strength, and possible leakage. At what temperature range do these concerns become critical in marine piping? • Consider which of the listed temperatures is most consistent with a conservative safety limit for threaded joints in pressure piping on ships. • Compare these temperatures to typical operating limits for common piping materials (like carbon steel) and ask: at what point would a designer be required to move away from screw joints to welded or flanged connections?

✅ Before You Answer

• Verify in 46 CFR Part 56 the specific subsection dealing with prohibited uses of screw/threaded joints in piping systems. • Check which temperature in the choices is commonly used as a design limit for threaded joints, below the higher temperature ranges where creep and relaxation become significant. • Eliminate answers that seem more appropriate for high‑temperature alloy systems where threaded joints would almost never be allowed in critical piping.

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