PIPE MARKING - AMMONIA
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Anhydrous ammonia is widely used as a refrigerant in food and drink production sites, including meat, poultry and fish processing facilities, dairy and ice cream plants, juice and soft drink processing facilities, and wineries and breweries.
Refrigerant grade anhydrous ammonia is a clear, colorless liquid or gas, free from visible impurities. It is at least 99.95 percent pure ammonia. Water cannot have a content above 33 parts per million (ppm) and oil cannot have a content above 2 ppm. Preserving the purity of the ammonia is essential to ensure proper function of the refrigeration system.
Ammonia is considered a high health risk that poses significant threat to workers. It is corrosive to the skin, eyes, and lungs, and can be deadly at elevated levels of exposure. It is also flammable at high concentrations.
To prevent accidents and reduce the risk of worker exposure, both the ANSI A 13.1 standard (used for non-ammonia piping), along with The International Institute of Ammonia Refrigeration (IIAR), requires thorough and specific labeling of all pipes and ducts that contain ammonia based refrigerants.
Ammonia Pipe Marking Requirements - IIAR Standards: All piping mains, headers and branches must identify the physical state of the ammonia based refrigerant (either vapor or liquid), its relative pressure level and the direction of its flow. All components of the refrigeration systems, including receivers and heat exchangers, should be consistently labeled as well.
The contents of a pipe is primarily identified by the textual information on a label. The label should provide the name of the contents of the pipe in an abbreviated form, with arrows indicating the directional flow of the contents. Identification of additional details of the hazard such as temperature, pressure, should also be included.
Non-Ammonia Pipe Marking: ANSI A13.1 requires a specified label lettering height depending on the outside diameter of the pipe it will mark. Any insulation and lagging should be included when determining the outside diameter. Lettering heights range from 1/2 inch for pipes with diameters that range from 3/4" to 1.25", up to 3-1/2 inches for pipes over 10" in diameter. DuraLabel offers the printers and supplies to fully comply with these ANSI pipe marking requirements.
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