NFPA Diamond 3-3-0 for Ammonia, Ammonia R-717This NFPA Diamond 3 3 0 provides proper safety and hazard identification of ammonia gas, anhydrous ammonia, or liquid ammonia to all workers and personnel on site. This NFPA Diamond 3 3 0 provides a clear hazard warning for employees in food processing plants, manufacturing plants, and cold storage facilities. Signs can help identify ammonia refrigeration systems, containers, storage locations and other areas where ammonia is in use. This NFPA Diamond