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6.7.3.4.2. The cylindrical portions, ends (heads) and manhole covers of shells of not more than 1,80 m in diameter shall be not less than 5 mm thick in the reference steel or of equivalent thickness in the steel to be used. Shells of more than 1,80 m in diameter shall be not less than 6 mm thick in the reference steel or of equivalent thickness in the steel to be used.

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Source: EUR-Lex (Cellar) · retrieved 2026-10-31 · Text as adopted (Official Journal); later amendments are not incorporated in this text.