Abstract: At approximately 7:45 p.m. on February 14, 1989, Employees #1 and #2 were changing a yoke adapter connection on a 150 lb chlorine tank filled with chlorine gas to have it serviced by an outside firm. The employees turned off the valve controlling the cylinder. Apparently the valve was faulty, allowing the gas to leak when the employees took off the adapter. The employees attempted to control the effects of the leak by donning provided respirators (full facepiece respirator with filter cartridge), but they were unable to control the leak. The employees called the local emergency number and emergency personnel responded and controlled the leak. Employee #1 was taken to Iredell Memorial Hospital in Statesville, NC, where he was treated and released. Employee #2 went to a local hospital in Elkin, NC, where he was treated and released.