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RE: Mill tests

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Although I have always required 1-1/2-inch "nominal diameter" pipe (1.900"
OD) for pipe railings, an NAAMM publication claims that OSHA requirements
have been clarified to mean "that the outside diameter shall not be less
than 1-1/2-inches - thus a 1-1/4-inch IPS pipe having an actual outside
diameter of 1.66-inches meets this requirement." And the ASTM standard for
metal railing systems (ASTM E985) states that the hand-grip "shall not be
less than 1-1/4-inches nor more than 2-inches in outside diameter". Thus it
appears that 1-1/4-inch diameter pipe is accepted in the industry despite
its apparent inconsistency with a literal reading of the wording in OSHA. 

Mark  Jones wrote:

In the case of handrails, this is moot because OSHA requires 1 1/2" nom.

"29 CFR 1910.23(e)(3)(ii) 
For pipe railings, posts and top and intermediate railings shall be at least
1 1/2 inches nominal diameter with posts spaced not