Terry is a senior process safety adviser at Oilind Safety, Inc., an Airgas Company. He can be reached at Terry.Gray@Airgas.com. Airgas, Inc. (Airgas.com), through its subsidiaries, is the largest U.S. distributor of industrial, medical, and specialty gases, and hardgoods, such as welding equipment and supplies, and one of the largest U.S. distributors of safety products.