USCG Exam PracticeAuxiliary machinery and mechanical systems
Under 46 CFR §56.50-80, sight-flow glasses used in lubricating-oil systems must meet which specific performance standard?
- A. They must withstand a hydrostatic test at 1.5 times the maximum working pressure of the system.
- B. They must be constructed of borosilicate glass rated for continuous service at 150°C.
- ✓ They must withstand exposure to a flame at 927°C (1,700°F) for one hour without appreciable leakage.Correct
- D. They must be fitted with automatic isolation valves that close upon breakage of the glass.
Why C is correct
46 CFR §56.50-80(h) states that sight-flow glasses may be used in lubricating-oil systems provided they can withstand exposure to a flame at a temperature of 927°C (1,700°F) for one hour without appreciable leakage. The other options describe plausible engineering requirements but are not stated in the regulation.
Cited:46 CFR §56.50-80