TESTING GROUND: The Piggly Wiggly in Columbus, Georgia, has served as a real-world test site for two refrigeration systems: a CO2/ammonia cascade system (the CO2 rack is to the left) and a more ...

The low stage CO2 circuit incorporates two screw compressors, a surge drum, pump set, two plate-and-shell condensers, and a high-pressure receiver.The refrigeration system also comprises two separate ...

Of the 223 sites inspected, 181 were using ammonia refrigeration systems. Inspecting officers issued 1,134 orders, three compliance agreements were created, and one stop use order was issued.