USCG Exam PracticeRefrigeration principles and systems
Under 46 CFR §58.20-5, what is the minimum design pressure requirement for pressure components in a marine refrigeration system?
- A. Pressure components must be designed for no less than 150 percent of the maximum allowable working pressure
- ✓ Pressure components must be designed for no less than the pressure for which the safety devices of the system are set, and not less than the minimums in ASME B31.5 Table 501.2.4Correct
- C. Pressure components must be designed for no less than the condenser operating pressure at maximum seawater temperature
- D. Pressure components must be designed for no less than the compressor rated discharge pressure at maximum speed
Why B is correct
46 CFR §58.20-5(a) states that the minimum pressures for design of all components must be those listed in ASME B31.5 Table 501.2.4, and in no case may pressure components be designed for a pressure less than that for which the safety devices of the system are set. Neither a 150-percent factor nor condenser or compressor operating pressures are cited as the governing minimum.
Cited:46 CFR §58.20-5