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Question: Would winding stairs attached to tanks be required to meet the requirements in §1910.25(d) for spiral stairs?
Answer:
No. Section 1910.21(b) defines spiral stairs as a "series of treads attached to a vertical pole in a winding fashion, usually within a cylindrical space" (emphasis added). Winding stairs attached to tanks do not have vertical poles; therefore, they are not spiral stairs and must meet the requirements of §1910.25(b) and (c).
