It is necessary to replace a branch suction...

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Question 1 of 205eccef9abacbc34ba4d450e9

It is necessary to replace a branch suction section of bilge system piping within the machinery space. The machinery space is 100' in length and 85' in breadth. The molded depth of the bulkhead deck is 25'. Which of the listed pipe sizes should be used?

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🔍 Key Concepts

• 46 CFR bilge piping requirements for minimum internal diameters based on vessel dimensions • How to calculate the required internal diameter of a bilge main or branch from the rule table/ formula • Difference between nominal pipe size, schedule, and internal diameter

💭 Think About

• First, use the machinery space dimensions given (length, breadth, molded depth of bulkhead deck) to determine which line in the regulation’s table or which formula applies to this vessel • Figure out the required internal diameter in inches from the regulation, then compare that required minimum to the actual internal diameters of each listed option • Think about how changing the pipe schedule (40 vs 80 vs 60) affects the internal diameter for the same nominal size

✅ Before You Answer

• Verify you are looking at the branch suction requirement (not the main bilge line) in 46 CFR • Confirm the vessel size range in the table or formula that matches 100' x 85' x 25' and read off the minimum diameter • Check the actual internal diameters of 2", 3", 4", 5" pipe in schedules 40, 60, and 80, and be sure the option you choose is not smaller than the minimum required

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