Pipe Marking - ANSI / ASME
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Pipe marking standards are provided by both the ASME and the ANSI Code. Both organizations have published the same code numbered A13.1. Other pipe marking codes may apply for specialized applications. For instance, the IIAR publishes the code for marking ammonia pipes used in refrigeration systems and the EN/DIN pipe marker standards are used in Europe.
Labels on pipes and valves provide important safety information. They inform staff, vendors, contractors, customers, and emergency response teams about the contents of the pipe, the hazard it poses, and the direction of flow through the pipe. This is critical information during an emergency situation.
The pipe contents in above ground piping systems are separated into three hazard categories and have different color coded labels associated with them.
High Hazard Materials: All high hazard materials use black characters on a yellow background
Low Hazard Materials: The low hazard materials are divided into two different color schemes depending on physical state:
- Liquid materials are labeled using white lettering on a green background
- Gaseous materials are labeled using white characters on a blue background
Fire Suppression Materials: Labels for fire suppression materials use white letters on a red background
A label must be placed on a pipe in a manner that makes it easy to read. Labels should be placed on the lower side of the pipe if the employee has to look up to the pipe, on the upper side of the pipe if the employee has to look down at the pipe. Labels have to be applied on all differing piping segments, including pipes that change direction or pass through walls and floors. They must also be placed at regular intervals on long runs of straight pipe.
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