USCG Exam PracticeRefrigeration and air conditioning
Under 46 CFR §58.20-5, what is the minimum design pressure requirement for pressure components in a vessel refrigeration system?
- A. Pressure components may be designed for any pressure provided the system has a relief valve
- ✓ Pressure components must be designed for no less than the pressure for which the safety devices of the system are setCorrect
- C. Pressure components must be designed for twice the normal operating pressure of the high side
- D. Pressure components must meet the minimum pressures listed in ASME B31.5 Table 501.2.4 only, with no additional constraint
Why B is correct
46 CFR §58.20-5(a) states that in no case may pressure components be designed for a pressure less than that for which the safety devices of the system are set. The ASME B31.5 Table 501.2.4 minimums also apply, but the safety-device-setpoint floor is an additional hard requirement.
Cited:46 CFR §58.20-5