OSHA Standard 29CR1910.144 calls for the marking of physical hazards and as for pipes and all others, Refer to ANSI Z53.1, Z35.1, Z35.2, Z35.4, and if you have any radio frequency radiation hazards, use ANSI C95.2
Are you in the U.S.? If so I pulled all that information out of an Industrial Sherwin-Williams company color chart. Call 800-524-5979 to have one of there experts help you. (that would be free help)
Hope that helps
laby
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Be careful of what you wish for .....
