Question 346General Subjects - 1st Asst/Chief

The correct answer is D) Refrigeration system receiver tank. According to 46 CFR 61, pressure vessels that are part of a refrigeration system are exempt from the hydrostatic testing requirements. This is because refrigeration system receiver tanks are typically designed and constructed to recognized industry standards, which provide an adequate margin of safety. The other options (A, B, and C) would not be exempt and would require periodic hydrostatic testing as specified in the regulations. Dearating feed tanks, potable water pressure tanks, and starting air receiver tanks are not considered part of a refrigeration system and therefore do not qualify for the exemption.