Question 94Safety & Environmental - Assistant Engineer

The correct answer is D) 16.7 psia - 14.2 psia. The normal pressure setting of a pressure-vacuum relief valve on tank vessels is typically between 16.7 psia (pounds per square inch absolute) and 14.2 psia. This pressure range is set to maintain the proper internal pressure within the tank and prevent the tank from becoming over- or under-pressurized, which could lead to damage or unsafe conditions. The other answer choices are incorrect because they fall outside the typical pressure range for these types of relief valves on tank vessels. Specifically, options A, B, and C represent either too high or too low of a pressure setting compared to the industry standard.