Under 46 CFR §61.20-23, a water-lubricated stern tube bearing (not rubber) on a vessel with propelling machinery located amidship must be rebushed when clearance reaches what value for a shaft of 250 mm (approximately 9.84 in) diameter?

Question

Accepted Answer

B. 7.95 mm (0.3125 in) — 46 CFR §61.20-23(a)(1) specifies 7.95 mm (0.3125 in) clearance for shafts exceeding 229 mm (9 in) but not exceeding 305 mm (12 in) in diameter with machinery amidship. A 250 mm shaft falls in that range. The 6.4 mm limit applies to shafts 229 mm or less, and 9.53 mm applies to shafts over 305 mm.

Answer

A. 6.4 mm (0.25 in)

Answer

C. 9.53 mm (0.375 in)

Answer

D. 1.6 mm (0.0625 in)

Under 46 CFR §61.20-23, a water-lubricated stern tube bearing (not rubber) on a vessel with propelling machinery located amidship must be rebushed when clearance reaches what value for a shaft of 250 mm (approximately 9.84 in) diameter?

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