Question 157Refrigeration & AC - Assistant Engineer

The correct answer is D. The relief valve settings shall be 1 1/4 times the maximum allowable working pressure. This is correct because the Coast Guard regulations require that the relief valve setting be set at a pressure no higher than 1 1/4 times the maximum allowable working pressure of the refrigeration system. This is to ensure that the system is adequately protected against overpressurization and potential rupture. The other options are incorrect because: B) specifies a lower rupture disk burst pressure than the regulations allow, C) allows for a rupture disk in series with the relief valve which is not permitted, and A) does not directly address the required relief valve setting.