Pipes that aren't clearly marked with contents are a danger to both people and property. That's why a uniform system for the identification of piping contents was established by The American Society of Mechanical Engineers (ASME) A13.1. Pipe markers effectively communicate the contents of the pipes and provide details of the flow direction and hazard classification. The specific legend, color, material, and visibility of your pipe marker communicates the distinct type of hazardous contents. Pipes containing Ammonia refrigeration need to meet the International Institute of Ammonia Refrigeration (IIAR) universal guidelines. GHS pipe marking is the uniform, worldwide system for the labeling of pipes that hold or transport chemical substances. Medical gas pipe markers identify the contents of medical gas. Duct markers mark the air flow. Safety is the priority - when pipes are properly marked, incidents are prevented and others remain safe.