Q: What if I have a pipe smaller than 0.75 inches in diameter?
A: For pipes of less than 0.75 inches in diameter, the use of a permanently legible tag is suggested. On many piping systems, there may be valves, actuators and transmitters that can be tricky to label with standard pipe markers. Valve tags can make labeling these awkward places quick and easy.
Q: Are particular shades of yellow, green, red and blue required for pipe labels?
A: Yes, ASME A13.1- 2015 references the technical definitions, color standards and color tolerances set forth in the American National Standards Institute (ANSI)/National Electrical Manufacturers Association (NEMA) Z535.1 Safety Colors standard which was last updated in 2017. The color shades suggested are intended to give the highest level of recognition to employees with both normal and color-deficient vision.
Q: Has ASME A13.1 been adopted by the Occupational Safety and Health Administration (OSHA)?
A: ASME A13.1 has not been incorporated by reference in 29 CFR 1910.144 (Safety Color Code for Marking Physical Hazards) or 1910.145 (Specifications for Accident Prevention Signs and Tags). It has been incorporated in a few of the specific special industry standards in 29 CFR 1910 Subpart R -pulp, paper and paperboard mills (29 CFR 1910.261) and textiles (1910.262) for example. Also, it is important to remember that industry voluntary consensus standards may be evidence that a hazard is recognized and there is a feasible means of correcting such a hazard. If a voluntary consensus standard is not followed, it is possible to be cited under OSHA’s General Duty Clause.
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