ANSI A13.1 requires that piping in an industrial setting include safety labels and pipe markers that communicate the contents of the pipes as well as arrows that indicate the direction of the flow. Hazards such as extreme temperature or pressure must also be identified if they exist.
The ANSI A13.1 standard separates materials carried in above-ground piping systems into three categories:
Pipe marker labels indicate which pipelines are dangerous, direction of flow, and pipe contents.
Differenet color codes are associated with the three hazard classes. All high-hazard materials use black characters on a yellow background.
Low-hazard materials are divided into two different color schemes depending on physical state. White lettering on a green background is used for liquid materials, and white lettering on a blue background is used for gaseous materials.
A pipe marking label must be 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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