USCG Exam PracticeBearings, lubrication, and care of machine parts
Under 46 CFR §56.50-80, sight-flow glasses installed in a lubricating-oil system must meet which specific fire-resistance standard?
- ✓ They must withstand a flame at 927 °C (1,700 °F) for one hour without appreciable leakage.Correct
- B. They must be fabricated of borosilicate glass rated to 538 °C (1,000 °F) for 30 minutes.
- C. They must be enclosed in a steel guard capable of containing any leakage for 30 minutes.
- D. They must withstand a flame at 760 °C (1,400 °F) for two hours without appreciable leakage.
Why A is correct
46 CFR §56.50-80(h) specifies that sight-flow glasses used in lubricating-oil systems must be able to withstand exposure to a flame at a temperature of 927 °C (1,700 °F) for one hour without appreciable leakage. The other temperature and duration combinations are not stated in the regulation.
Cited:46 CFR §56.50-80(h)