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Pressure vessels for refrigeration systems over 6 inches (152.4 mm) inside diameter with a design pressure of 15-psig.(6.304 kg) or greater shall be designed, constructed, tested and stamped in accordance with the American Society of Mechanical Engineers Code for Unfired Pressure Vessels. Pressure vessels 6 inches (152.4 mm) inside diameter and smaller or under 15 psig (6.304 kg) pressure shall be designated and constructed in accordance with the American Society of Mechanical Engineers Code requirements for Unfired Pressure Vessels.