Reference

Federal OSHA has no general-industry pipe-marking standard, and the 1956 edition it does incorporate is 67 years behind the one vendors sell today. This guide locates the duty section by section, then gives the two tables a specifier actually needs: the full ASME A13.1-2023 colour scheme and the marker size schedule by pipe diameter.

OSHA-format and ANSI Z535 signs are both legally acceptable, for entirely different reasons. This guide compares the two sign faces element by element, explains what an ANSI compliant vendor badge does not tell a buyer, and gives five questions for choosing a system, with migration staging and purchase specification language.

OSHA sets safety sign rules in two separate places, and the ANSI editions it incorporates run two to three revisions behind what vendors sell as current. This guide decodes the three sign classes at 1910.145(c), the specified colors, accident prevention tags, and the construction table at 1926.200, plus exit and aisle marking duties.